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Effects of Ru on the microstructure and phase stability of a single crystal superalloy 被引量:8
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作者 Zhen-xue Shi jia-rong li Shi-zhong liu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第11期1004-1009,共6页
Two experimental single crystal superalloys, the Ru-free alloy and the Ru-containing alloy with [001 ] orientation, were cast in a directionally solidified furnace, while other alloying element contents were kept unch... Two experimental single crystal superalloys, the Ru-free alloy and the Ru-containing alloy with [001 ] orientation, were cast in a directionally solidified furnace, while other alloying element contents were kept unchanged. The effects of Ru on the microstructure and phase stability of the single crystal superalloy were investigated, y' directional coarsening and rafting were observed in the Ru-free alloy and Ru-containing alloy after long-term aging at 1070~C for 800 h. Needle-shaped o topologically close packed (TCP) phases precipitated and grew along the fixed direction in both the alloys. The precipitating rate and volume fraction of TCP phases decreased significantly by adding Ru. The compositions ofy and y' phases measured using an energy-dispersive X-ray spectroscope (EDS) in transmission electron microscopy (TEM) analysis showed that the addition of Ru lessened the partition ratio of TCP forming elements, Re, W and Mo, and decreased the satu- ration degrees of these elements in y phase, which can enable the Ru-containing alloy to be more resistant to the formation of TCP phases. It is indicated that the addition of Ru to the Ni-based single crystal superalloy with high content of the refractory alloying element can enhance phase stability. 展开更多
关键词 SUPERALLOYS nickel alloys single crystals RUTHENIUM MICROSTRUCTURE phase stability
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Blood exosomal micro ribonucleic acid profiling reveals the complexity of hepatocellular carcinoma and identifies potential biomarkers for differential diagnosis 被引量:6
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作者 Lang-Qing Sheng jia-rong li +15 位作者 Hao Qin ling liu Da-Dong Zhang Qi Zhang Meng-li Huang Xiao-li li Xiao-Ya Xu Yang-Nian Wei Zi-Shuo Chen Hui Luo Ji-Yang Zhang Cheng-Hui Zhou Hao Chen Ze-Guo Chen Fu-Gen li Nian-Feng li 《World Journal of Gastrointestinal Oncology》 SCIE CAS 2020年第10期1195-1208,共14页
BACKGROUND Hepatocellular carcinoma(HCC)is one of the leading causes of cancer-related deaths worldwide,but there is a shortage of effective biomarkers for its diagnosis.AIM To explore blood exosomal micro ribonucleic... BACKGROUND Hepatocellular carcinoma(HCC)is one of the leading causes of cancer-related deaths worldwide,but there is a shortage of effective biomarkers for its diagnosis.AIM To explore blood exosomal micro ribonucleic acids(miRNAs)as potential biomarkers for HCC diagnosis.RESULTS The principal component analysis suggested that daily alcohol consumption could alter the blood exosomal miRNA profiles of hepatitis B virus positive non-HCC patients through miR-3168 and miR-223-3p.The miRNA profiles also revealed the tumor stages of HCC patients.High expression of miR-455-5p and miR-30c-5p,which significantly correlated with better overall survival in tumor tissues,could also be detected in blood exosomes.Two pairs of miRNAs(miR-584-5p/miR-106-3p and miR-628-3p/miR-941)showed a 94.1%sensitivity and 68.4%specificity to differentiate HCC patients from non-HCC patients.The specificity of the combination was substantially influenced by alcohol consumption habits.CONCLUSION This study suggested that blood exosomal miRNAs can be used as new noninvasive diagnostic tools for HCC.However,their accuracy could be affected by tumor stage and alcohol consumption habits. 展开更多
关键词 Blood exosomal micro ribonucleic acids Biomarker Differential diagnosis Alcohol consumption habit Hepatocellular carcinoma BIOINFORMATICS
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Genetic causal relationship between tea intake and cerebral aneurysm: a two-sample Mendelian Randomization Study
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作者 Da-Yuan Zhong Hui Cheng +6 位作者 Zheng-Hua Pan Xue-Ming Ou Ping-Wen liu Xiang-Bo Kong jia-rong li De-liang liu Jia-Qi Chen 《Medical Data Mining》 2023年第3期50-55,共6页
Background:Prior research has established a strong link between cerebral aneurysm(CA)occurrence and inflammation.Tea intake(TI)has been found to have anti-inflammatory properties through multiple mechanisms,potentiall... Background:Prior research has established a strong link between cerebral aneurysm(CA)occurrence and inflammation.Tea intake(TI)has been found to have anti-inflammatory properties through multiple mechanisms,potentially lowering CA incidence.This study aims to employ Mendelian Randomization(MR)methodology to explore the genetic causality between TI and CA.Methods:We collected Genome-wide association study(GWAS)data for CA,TI,Green tea intake(GTI),Herbal tea intake(HTI),and Rooibos tea intake(RTI).The MR analysis employed the TwoSampleMR package and utilized the inverse variance-weighted(IVW)method.Results:The findings suggest no genetic causal relationship between TI and CA(IVW:OR=1.10,95%CI:0.59–2.05,P=0.772).Similarly,there is no genetic causal association between GTI and CA(IVW:OR=1.07,95%CI:0.91–1.26,P=0.388),HTI and CA(IVW:OR=1.00,95%CI:0.89–1.13,P=0.943),or RTI and CA(IVW:OR=1.02,95%CI:0.96–1.09,P=0.472).Conclusion:There is no genetic causal relationship between TI and CA,and the different types of tea do not change this result.Further MR analysis is needed to investigate whether there is a potential genetic causal association between the quantity of TI and CA. 展开更多
关键词 tea intake cerebral aneurysm genome-wide association study Mendelian Randomization Study
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Study on mechanism and molecular docking verification of Angelicae Sinensis Radix and Astragali Radix in treating ischemic stroke
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作者 Da-Yuan Zhong Hui Cheng +8 位作者 Hong-Sheng Luo Yi-Hui Deng Huan-Jie li De-liang liu Xue-Ming Ou Ping-Wen liu jia-rong li Xiang-Bo Kong Jia-Qi Chen 《TMR Modern Herbal Medicine》 2023年第2期9-17,共9页
Background:Traditional Chinese medicine(TCM)has been shown to be effective in treating ischemic stroke(IS),and the combination of Angelicae Sinensis Radix(ASR)and Astragali Radix(AR)is a core TCM prescription that is ... Background:Traditional Chinese medicine(TCM)has been shown to be effective in treating ischemic stroke(IS),and the combination of Angelicae Sinensis Radix(ASR)and Astragali Radix(AR)is a core TCM prescription that is widely acknowledged for its efficacy in IS treatment.This study utilized network pharmacology methods to explore the molecular mechanisms underlying the therapeutic effects of Angelicae Sinensis Radix and Astragali Radix in IS treatment,with preliminary validation conducted through molecular docking.Methods:Information on the structure,targets,main biological functions,and pathways of the active components in Angelicae Sinensis Radix and Astragali Radix was collected using databases such as PubChem,PharmMapper,UniProt,and GeneCards.The results were visualized using software such as Cytoscape 3.6.1,Ledock,and pymol.Results:We retrieved 20 active components and 149 targets associated with the compatibility of Angelicae Sinensis Radix and Astragali Radix from various databases,and GeneCards database was used to search 3350 IS-related gene targets,including 78 key targets of Angelicae Sinensis Radix and Astragali Radix for the treatment of IS.Enrichment analysis of these 78 targets using gene ontology(GO)and Kyoto Encyclopedia of Genes and Genomes(KEGG)revealed the involvement of 48 GO terms in the treatment of IS,mainly in biological processes such as metabolism,biological regulation,and stress response.The composition of biological devices such as supercavitary membrane,cell fluid,and extracellular space was also involved.The biological functions mainly included protein binding,ion binding,hydrolytic enzyme activity,and others.The identified pathways were estrogen signaling pathway,mitogen-activated protein kinase(MAPK)signaling pathway,PI3K-AKT signaling pathway,RAP1 signaling pathway,P53 signaling pathway,PPAR signaling pathway,FOXO signaling pathway,RAS signaling pathway,prolactin signaling pathway,HIF-1 signaling pathway,and TNF signaling pathway.Molecular docking analysis showed that the 17 key active components of Angelicae Sinensis Radix and Astragali Radix had strong binding activity with 13 IS key targets.Conclusion:Through the application of network pharmacology methods,it was found that the use of Angelicae Sinensis Radix and Astragali Radix for treating ischemic stroke mainly targets the MAPK and PI3K-AKT signaling pathways,involving several crucial compounds and genes.Nevertheless,additional in vitro and in vivo studies are needed to verify these findings. 展开更多
关键词 Angelicae Sinensis Radix Astragali Radix ischemic stroke network pharmacology molecular docking
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型壳加热温度对单晶高温合金显微组织及“雀斑”形成的影响
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作者 王志成 李嘉荣 +2 位作者 刘世忠 杨万鹏 王效光 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第4期1191-1203,共13页
利用所设计的阶梯试样进行定向凝固试验和模拟,研究定向凝固过程型壳加热温度对单晶高温合金铸件显微组织和“雀斑”形成的影响。分析糊状区的温度场及形貌。结果表明,升高型壳加热温度,一次和二次枝晶间距减小,糊状区液相的渗透率和对... 利用所设计的阶梯试样进行定向凝固试验和模拟,研究定向凝固过程型壳加热温度对单晶高温合金铸件显微组织和“雀斑”形成的影响。分析糊状区的温度场及形貌。结果表明,升高型壳加热温度,一次和二次枝晶间距减小,糊状区液相的渗透率和对流通道的宽度降低,“雀斑”形成倾向性降低,“雀斑”宽度减小,“雀斑”区域枝晶碎片减少。此外,随着型壳加热温度的升高,糊状区液相冷却速率增加,糊状区熔体的冷却时间减少,液体流动对枝晶的破碎程度得到削弱,这进一步降低单晶高温合金铸件“雀斑”形成的倾向性。 展开更多
关键词 单晶高温合金 “雀斑”形成 型壳加热温度 定向凝固 数值模拟
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Polyneuropathy, organomegaly, endocrinopathy, M-protein, skin changes syndrome with dilated cardiomyopathy: A case report
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作者 jia-rong li Lei-Yu Feng +2 位作者 Jian-Wei li Yu liao Fei-Qi liu 《World Journal of Clinical Cases》 SCIE 2024年第3期601-606,共6页
BACKGROUND Polyneuropathy,organomegaly,endocrinopathy,M-protein,skin changes(POEMS)syndrome is a rare paraneoplastic syndrome that encompass multiple systems.The most common clinical symptoms of POEMS syndrome are pro... BACKGROUND Polyneuropathy,organomegaly,endocrinopathy,M-protein,skin changes(POEMS)syndrome is a rare paraneoplastic syndrome that encompass multiple systems.The most common clinical symptoms of POEMS syndrome are pro-gressive sensorimotor polyneuropathy,organ enlargement,endocrine disorders,darkening skin,a monoclonal plasma cell proliferative disorder,and lymph node hyperplasia.The organomegaly consists of hepatosplenomegaly and/or lym-phadenopathy;cases of cardiomyopathy are rare.Diagnoses are often delayed because of the atypical nature of the syndrome,exposing patients to possibly severe disability.Therefore,identifying atypical symptoms can improve the prognosis and quality of life among POEMS syndrome patients.lenalidomide and dexamethasone.CONCLUSION When patients with cardiomyopathy have systemic manifestations such as numb limbs and darkening skin,the POEMS syndrome is the most possible diagnosis. 展开更多
关键词 POLYNEUROPATHY organomegaly ENDOCRINOPATHY M-PROTEIN skin changes syndrome Dilated cardiomyopathy LENALIDOMIDE Dexamethasone Case report
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Orientation dependence of transverse tensile properties of nickel-based third generation single crystal superalloy DD9 from 760 to 1100 ℃ 被引量:17
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作者 Wan-peng YANG jia-rong li +3 位作者 Shi-zhong liU Zhen-xue SHI Jin-qian ZHAO Xiao-guang WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第3期558-568,共11页
At temperatures ranging from 760 to 1100 °C, the tensile properties of a nickel-based third generation single crystal superalloy DD9 with [100],[120] and [110] orientations were studied. The microstructures and f... At temperatures ranging from 760 to 1100 °C, the tensile properties of a nickel-based third generation single crystal superalloy DD9 with [100],[120] and [110] orientations were studied. The microstructures and fracture surfaces were observed by OM, SEM and TEM. Results show that the tensile strength of [100] specimen is higher than that of [120] and [110] specimens at 760 and 850 °C;while at the temperatures higher than 980 °C, the tensile strength of all specimens has little difference. The fracture mechanisms of [100],[120] and [110] specimens are the same at 760 and 980 °C. At 1100 °C, the fracture surfaces of [100] and [120] specimens are characterized by dimple features;while [110] specimen shows mixed quasi-cleavage and dimple featured fracture surfaces. At 760 °C, obvious superlattice stacking faults (SSFs) are observed only in [100] specimen;while at 1100 °C, the dislocation configurations of all specimens are similar. The difference in the number of potential active slip systems in [100],[120] and [110] specimens during the tensile deformation process is the main reason for the transverse tensile anisotropy. 展开更多
关键词 third generation single crystal superalloy DD9 transverse tensile properties ANISOTROPY fracture surface
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Study on mechanisms and molecular verification of Buyang Huanwu decoction in treating ischemic stroke from the perspective of cuproptosis
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作者 Da-Yuan Zhong Hui Cheng +11 位作者 Hong-Sheng Luo Quan li Lan li Huan-Jie li Chun-Guang Guan De-liang liu Ping-Wen liu jia-rong li Xiang-Bo Kong Jia-Qi Chen Yi-Hui Deng Xue-Ming Ou 《TMR Integrative Medicine》 2023年第13期1-10,共10页
Background:Ischemic stroke(IS)is a global health issue and the current treatment options for IS are inadequate.Buyang Huanwu decoction(BHD)has demonstrated effectiveness in treating IS.However,the mechanisms by which ... Background:Ischemic stroke(IS)is a global health issue and the current treatment options for IS are inadequate.Buyang Huanwu decoction(BHD)has demonstrated effectiveness in treating IS.However,the mechanisms by which BHD treats IS remain unclear,and no studies have been conducted to analyze these mechanisms from the perspective of Cuproptosis.In order to investigate the potential of BHD to intervene in IS through Cuproptosis,this study employed a systematic pharmacological approach and molecular docking verification.Methods:To investigate the mechanism of BHD in treating IS through Cuproptosis,relevant information on the structure,targets,and major biological functions and pathways of compounds related to BHD was collected from databases such as PubChem,PharmMapper,UniProt,and GeneCards.The results were then visualized using Cytoscape3.6.1,Ledock,and pymol software.Results:BHD is composed of 7 Chinese medicines,which contain 82 compounds,including 10 core compounds.These compounds are associated with 241 genes,of which 97 are common to BHD,IS,and Cuproptosis.The 97 common genes,including 10 core genes,are involved in biological processes such as proteolysis,regulation of apoptosis and cholesterol storage,as well as cellular components and molecular functions.The common genes among BHD,IS,and Cuproptosis,including 10 core genes,participate mainly in Kyoto Encyclopedia of Genes and Genomes pathways such as pathways in cancer,PI3K-Akt signaling pathway,and Estrogen signaling pathway.According to molecular docking results,linolenic acid showed good docking scores with 9 out of 10 core genes,except for SRC.13-hydroxy-9,11-octadecadienoic acid also demonstrated good docking scores with EGFR,MAPK14,and F2.Similarly,senkyunone also had good docking scores with EGFR,MAPK14,and F2,all of which had docking energy greater than−5 kcal.Conclusion:In this study,the potential of BHD for treating IS through Cuproptosis and its underlying mechanisms were explored and partially validated through molecular docking.However,due to the limitations of the systems pharmacology research method,further validation through cell experiments,animal experiments,and clinical trials may be necessary to confirm these findings. 展开更多
关键词 Buyang Huanwu decoction ischemic stroke network pharmacology molecular docking
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Effect of cellular recrystallization on tensile properties of a nickel-based single crystal superalloy containing Re and Ru 被引量:2
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作者 Zhen-xue Shi Shi-zhong liu +4 位作者 Xiao-dai Yue li-jie Hu Wan-peng Yang Xiao-guang Wang jia-rong li 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2017年第10期1059-1064,共6页
A nickel-based single crystal superalloy containing Re and Ru was cast in a directional solidification furnace.The single crystal specimens after standard heat treatment were grit blasted with different pressures and ... A nickel-based single crystal superalloy containing Re and Ru was cast in a directional solidification furnace.The single crystal specimens after standard heat treatment were grit blasted with different pressures and then heat treated at 1100°C for 4 hunder vacuum condition.The evolution of recrystallized microstructure and its effect on the tensile properties at 850 and 980°C were investigated.After heat treatment,the cellular microstructure was observed,and the thickness of the cellular recrystallization zone increases with the increase in grit blasting pressure.The appearance of the cellular structure undermines the tensile properties.Both the tensile strength and elongation decrease with increasing the thickness of the cellular structure.The recrystallized grain boundaries can act as the channels for the crack initiation and propagation during tensile test.The low bearing capacity of recrystallized layers and the local stress concentration resulting from the notch effect of cracking were the main reasons for the decrease of tensile properties. 展开更多
关键词 Single crystal superalloy Cellular recrystallization Tensile property MICROSTRUCTURE Fracture morphology
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Effects of Heat Treatment on Surface Recrystallization and Stress Rupture Properties of a Fourth-Generation Single-Crystal Superalloy after Grit Blasting 被引量:5
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作者 Zhen-Xue Shi Shi-Zhong liu +1 位作者 Xiao-Guang Wang jia-rong li 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2017年第7期614-620,共7页
The specimens of a fourth-generation single-crystal superalloy were grit-blasted and heat-treated in vacuum at 1100, 1150, 1200, 1250 and 1300 °C for 4 h, respectively. Then, the microstructure and the stress rup... The specimens of a fourth-generation single-crystal superalloy were grit-blasted and heat-treated in vacuum at 1100, 1150, 1200, 1250 and 1300 °C for 4 h, respectively. Then, the microstructure and the stress rupture properties of the recrystallized alloy were investigated at 1150 °C/120 MPa. The results showed that a cellular recrystallization occurred in the surface layer after heating at 1100, 1150 and 1200 °C for 4 h. An equiaxed recrystallization formed as the specimen was heat-treated at 1300 °C for 4 h, while a mixed recrystallization occurred in the specimen heat-treated at 1250 °C for 4 h. The recrystallized depth clearly increased with a rise of the heat treatment temperature. The stress rupture life continuously decreased with a rise of the heat treatment temperature up to 1250 °C. Although the overall stress rupture life reduced to different degrees, the stress rupture life of specimen after heat treatment at 1300 °C was relatively high and intermediate between those of specimens treated at 1150 and 1200 °C. The fact that the stress rupture life reduced to different degrees after heat treatment can be attributed to the recrystallization of the surface layer and to the microstructure evolution of the interior of the specimen. The small γ’ phase precipitated again after heat treatment at 1300 °C for 4 h. So,the stress rupture life was relatively longer than that after heat treatment at 1200 or 1250 °C although the equiaxed recrystallization formed in the surface layer. 展开更多
关键词 Single-crystal superalloy Heat treatment Recrystallization Stress rupture properties
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Sub-solvus Cellular Recrystallization and P Phase Formation in a Single-Crystal Superalloy Containing Re
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作者 Long-Chao Zhuo Ming Huang +2 位作者 Ji-Chun Xiong jia-rong li Jing Zhu 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2015年第1期72-76,共5页
Sub-solvus recrystallization behavior of a second-generation single-crystal superalloy has been studied by transmission electron microcopy and scanning transmission electron microcopy. Surface local stress facilitated... Sub-solvus recrystallization behavior of a second-generation single-crystal superalloy has been studied by transmission electron microcopy and scanning transmission electron microcopy. Surface local stress facilitated cellular recrystallization accompanied with formation of twin structure and TCP phase of P during annealing at sub-solvus temperature of 1,100 °C. The precipitation of P phase is considered to be attributed to the coarsening of c0 phase in the recrystallized aggregates which lower the activation energy for atomic migration. 展开更多
关键词 Nickel-based single-crystal superalloys Interfaces Recrystallization Twin boundary STEM
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Forming and growing mechanisms of homogenization-solution pores in a single crystal superalloy 被引量:3
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作者 Xiao-Dai Yue jia-rong li +1 位作者 Xiao-Guang Wang Zhen-Xue Shi 《Rare Metals》 SCIE EI CAS CSCD 2018年第5期399-406,共8页
The forming and growing mechanisms of homogenization-solution pores in a single crystal superalloy were investigated. The microstructures were observed with optical microscope (OM) and field emission microscope (FE... The forming and growing mechanisms of homogenization-solution pores in a single crystal superalloy were investigated. The microstructures were observed with optical microscope (OM) and field emission microscope (FEM) after homogenization-solution heat treated at 1328℃ and 1350 ℃ for 2 h, 6 h and 9 h. Results indicate that when heat treated at 1328 ℃, pores appear at the interface of eutectic and matrix at first and then leave in the matrix with the shrink of eutectic. When heat treated at 1350 ℃, incipient melting happens at first, and some of them have a pore in the center. After that, with the homogenization-solution process, incipient melting microstructure fades away gradually. By analyzing the results with thermodynamics and kinetics methods, it is concluded that some pores nucleate during directional solidification and then become larger and visible during homogenization-solution heat treatments; some pores are generated by incipient melting, yet such pores are difficult to be distinguished from other pores; imbalanced elements cross-diffusion induces to the forming and growing of pores too, and such imbalanced diffusion also plays an important part on the growth of all preexisting pores. 展开更多
关键词 Single crystal superalloy PORE HOMOGENIZATION SOLUTION Heat treatment Incipient melting
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Rejuvenation Heat Treatment of the Second-Generation Single-Crystal Superalloy DD6 被引量:2
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作者 Zhen-Xue Shi Shi-Zhong liu jia-rong li 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2015年第10期1278-1285,共8页
The second-generation single-crystal superalloy DD6 with [001] orientation was prepared by screw selecting method in the directionally solidified furnace. The long-term aging of the alloy after full heat treatment was... The second-generation single-crystal superalloy DD6 with [001] orientation was prepared by screw selecting method in the directionally solidified furnace. The long-term aging of the alloy after full heat treatment was performed at1100 °C for 400 h. Then the rejuvenation heat treatment 1300 °C/4 h/AC ? 1120 °C/4 h/AC ? 870 °C/24 h/AC was carried out. The stress rupture properties were investigated at 760 °C/800 MPa, 850 °C/550 MPa, 980 °C/250 MPa and1100 °C/140 MPa after different heat treatments. The microstructures of the alloy at different conditions were studied by SEM. The results show that c0 phase of the alloy became very irregular and larger after long-term aging at 1100 °C for 400 h. A very small amount of needle-shaped TCP phase precipitated in the dendrite core. The coarsened c0 phase and TCP phase dissolved entirely after rejuvenation heat treatment. The microstructure was restored and almost same with the original microstructure. The stress rupture life of the alloy decreased in different degrees at various test conditions after long-term aging. The stress rupture life of the alloy after rejuvenation heat treatment all restores to the original specimen more than 80%at different conditions. The microstructure degradation of the alloy during long-term aging includes coarsening of the c0 phase,P-type raft and precipitation of TCP phase, which results in the degeneration of stress rupture property. The rejuvenation heat treatment succeeds in restoring the original microstructure and stress rupture properties of the alloy. 展开更多
关键词 Single-crystal superalioy DD6 Rejuvenation heat treatment Stress rupture properties
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The microstructure of a single crystal superalloy after different aging heat treatments 被引量:7
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作者 Xiao-Dai Yue jia-rong li Xiao-Guang Wang 《Rare Metals》 SCIE EI CAS CSCD 2018年第3期210-216,共7页
To study the influence of aging heat treatments on the microstructure of single crystal superalloys with high content of refractory elements and optimal the aging heat treatment regimes, a single crystal superalloy co... To study the influence of aging heat treatments on the microstructure of single crystal superalloys with high content of refractory elements and optimal the aging heat treatment regimes, a single crystal superalloy containing 22 wt% refractory elements was investigated.Results show that for the experimental alloy, even the homogenization-solution heat treatment for 25 h cannot homogenize the alloying elements completely. During primary aging heat treatment, γ' phase grows larger and turns to regular cubes. Higher aging temperature induces larger γ' cubes. For specimens with primary aging heat treated at 1120 ℃,γ' morphology does not change apparently during secondary aging heat treatment. For specimens with primary aging heat treatment at 1150 ℃,γ'phase in interdendrite grows obviously comparing with that in dendrites. By analyzing the precipitating kinetics of γ'phase, it is found that owning to the dendrite segregation and different aging heat treatment temperatures, γ' phase at different regions grows under the control of different factors at different aging heat treatment stages. The two controlling factors that are driving forces of phase transformation and element diffusion rate induce obviously different growth rates of γ' phase. As a result, the γ'-precipitating behaviors are variable based on different solute concentrations and aging temperatures. For advanced single crystal superalloys that are supposed to be used at relatively high temperatures, the final γ' size after aging heat treatment is suggested to be close to the crossing point of diffusion controlling curve and driving force controlling curve corresponding to the serving temperature. And then,high-temperature properties can be improved. 展开更多
关键词 Single crystal superalloy Aging heat treatment γ' precipitation Kinetics
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A novel synthesis of nitroform by the nitrolysis of cucurbituril 被引量:2
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作者 Hong-Yan Lu jia-rong li +2 位作者 De-li Yang Qi Zhang Da-Xin Shi 《Chinese Chemical Letters》 SCIE CAS CSCD 2015年第3期365-368,共4页
Cucurbituril has a high symmetry and rigid structure.When cucurbit[6]uril(CB[6]) was nitrolyzed with the mixed solution of acetic anhydride in fuming nitric acid,nitroform(NF) was generated.NF also can be obtained... Cucurbituril has a high symmetry and rigid structure.When cucurbit[6]uril(CB[6]) was nitrolyzed with the mixed solution of acetic anhydride in fuming nitric acid,nitroform(NF) was generated.NF also can be obtained by the nitration of both CB[5,7,8].This nitration procedure provides a lower risk,inexpensive,new preparation of nitroform,and the reaction condition of this new method is very mild. 展开更多
关键词 anhydride inexpensive acetic symmetry rigid oligomer supramolecular hexane condensation solubility
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A phase-selective,bis-urea organogelator with a curved bis-naphthalene core 被引量:1
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作者 Huan Yao liu-Pan Yang +2 位作者 Zhen-feng He jia-rong li Wei Jiang 《Chinese Chemical Letters》 SCIE CAS CSCD 2017年第4期782-786,共5页
A phase-selective,bis-urea organogelator with a curved bis-naphthalene core was synthesized and characterized.This gelator is capable of gelating a variety of hydrocarbons and oils.The resulting gels have been charact... A phase-selective,bis-urea organogelator with a curved bis-naphthalene core was synthesized and characterized.This gelator is capable of gelating a variety of hydrocarbons and oils.The resulting gels have been characterized by rheology,SEM,and molecular modelling.The gelator can be applied in the powder form for the recovery of a thin layer of petrol oil spill in water. 展开更多
关键词 Organogelator Phase-selective Bis-naphthalene Supramolecular gel Oil spill recovery
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Tensile Behavior of the Second Generation Single Crystal Superalloy DD6
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作者 Zhen-xue SHI Shi-zhong liU +1 位作者 Jian YU jia-rong li 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2015年第8期738-742,共5页
Tensile properties of the second generation single crystal superalloy DD6 were investigated from 20 ℃ to 1 100 ℃. Microstructure evolution and fracture mechanism were examined by scanning electron microscopy (SEM)... Tensile properties of the second generation single crystal superalloy DD6 were investigated from 20 ℃ to 1 100 ℃. Microstructure evolution and fracture mechanism were examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the tensile strength decreases slightly with increasing temperature from 20 ℃ to 400 ℃. The tensile strength of the alloy increases with the increase of temperature from 400 ℃ to 800 ℃. Above 800 ℃, the yield strength of the alloy decreases greatly with increasing temperature. The elongation and contraction of area almost present opposite tendency in contrast to changes of the tensile strength. At lower and intermediate temperature (from 20 ℃ to 850 ℃), the tensile fracture mechanism shows quasi-cleavage mode, while at high temperature (980 ℃ and 1 100 ℃), it is dimple mode. The γ' precipitate morphology still maintains cubic after tensile fracture at lower and intermediate temperature. The γ' phase changes into rectangular solid at high temperature. The γ' phase is sheared by anti-phase boundary (APB) or stacking faults at lower and intermediate temperature. At high temperature, dislocations overcome γ' through by-passing mechanism. 展开更多
关键词 single crystal superalloy DD6 tensile behavior microstructure evolution
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Color-electric conductivity in a viscous quark-gluon plasma
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作者 Bing-feng Jiang Shao-wu Shi +1 位作者 De-fu Hou jia-rong li 《Chinese Physics C》 SCIE CAS CSCD 2021年第5期157-165,共9页
Several different transport processes, such as heat, momentum, and charge transports, may occur simultaneously in a thermal plasma system. The corresponding transport coefficients are heat conductivity, shear viscosit... Several different transport processes, such as heat, momentum, and charge transports, may occur simultaneously in a thermal plasma system. The corresponding transport coefficients are heat conductivity, shear viscosity, and electric conductivity. In the present study, we investigate the color-electric conductivity of the quark-gluon plasma(QGP) in the presence of shear viscosity, focusing on the connection between the charge transport and momentum transport. To achieve this goal, we solve the viscous chromohydrodynamic equations obtained from the QGP kinetic theory associated with the distribution function modified by shear viscosity. According to the solved color fluctuations of hydrodynamic quantities, we obtain the induced color current through which the color-electric conductivity is derived. Numerical analysis shows that the conductivity properties of the QGP are mainly demonstrated by the longitudinal part of the color-electric conductivity. Shear viscosity has an appreciable impact on real and imaginary parts of the color-electric conductivity in some frequency regions. 展开更多
关键词 color-electric conductivity quark-gluon plasma shear viscosity viscous chromohydro-dynamics
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