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《材料表界面》教学中的多元教学模式设计 被引量:2
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作者 赵雪伶 陈立飞 朱志刚 《才智》 2019年第32期165-165,共1页
《材料表界面》课程内容复杂多样,这些内容理论性和实践性比较突出,在课程内容教学的时候,需要和表面工程实际问题结合在一起实施教学,这就需要利用多元化教学模式,对课程实施一系列改革,推动教学效果更加显著。
关键词 《材料表界面》 多元教学模式 设计
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Characterization and evaluation of interface in SiC_p/2024 Al composite 被引量:8
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作者 柳培 王爱琴 +1 位作者 谢敬佩 郝世明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第5期1410-1418,共9页
35% SiCp/2024 Al(volume fraction) composite was prepared by powder metallurgy method. The microstructures of Si Cp/Al interfaces and precipitate phase/Al interfaces were characterized by HRTEM, and the interface con... 35% SiCp/2024 Al(volume fraction) composite was prepared by powder metallurgy method. The microstructures of Si Cp/Al interfaces and precipitate phase/Al interfaces were characterized by HRTEM, and the interface conditions were evaluated by tensile modules of elasticity and Brinell hardness measurement. The results show that the overall Si Cp/Al interface condition in this experiment is good and three kinds of Si Cp/Al interfaces are present in the composites, which include vast majority of clean planer interfaces, few slight reaction interfaces and tiny amorphous interfaces. The combination mechanism of Si C and Al in the clean planer interface is the formation of a semi-coherent interface by closely matching of atoms and there are no fixed or preferential crystallographic orientation relationships between Si C and Al. MgAl2O4 spinel particles act as an intermediate to form semi-coherent interface with SiC and Al respectively at the slight reaction interfaces. When the composite is aged at 190 °C for 9 h after being solution-treated at 510 °C for 2 h, numerous discoid-shaped and needle-shaped nanosized precipitates dispersively exist in the composite and are semi-coherent of low mismatch with Al matrix. The Brinell hardness of composites arrives peak value at this time. 展开更多
关键词 SiCp/2024 Al composite INTERFACE precipitate phase CHARACTERIZATION
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Microstructures and mechanical properties of Ni-coated SiC particles reinforced AZ61 alloy composites 被引量:5
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作者 Su-qing GUO Ri-chu WANG +2 位作者 Chao-qun PENG Zhi-yong CAI Cui-ge DONG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第9期1854-1863,共10页
In order to improve the interface bonding of SiCp/AZ61 composites prepared by powder metallurgy followed by hot extrusion, the electroless plating of Ni-P coating on SiCp was carried out. The influence of Ni coating o... In order to improve the interface bonding of SiCp/AZ61 composites prepared by powder metallurgy followed by hot extrusion, the electroless plating of Ni-P coating on SiCp was carried out. The influence of Ni coating on microstructure and mechanical properties of the composites was analyzed. The results show that SiC particles distribute more uniformly in the composites after surface Ni plating and there are fewer defects in Ni-coated composite. The Ni coating reacts with the magnesium matrix forming the Mg2Ni interfacial compound layer during the sintering process. The relative density of the composite increases from 97.9% to 98.4% compared with uncoated one and the hardness of the Ni-coated composite increases more rapidly as the volume fraction of SiCp increases. The tensile test results show that the tensile strength increases from 320 to 336 MPa when the volume friction of SiC particle is 9% and the Ni-coated composites have larger elongation, indicating that Ni coating improves the interfacial bonding strength and the performance of the composites. In addition, the fracture properties of SiCp/AZ61 composites were analyzed. 展开更多
关键词 AZ61 matrix composites Ni-coated SiCp interface bonding mechanical properties surface modification
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Interface microstructure and mechanical properties of selective laser melted multilayer functionally graded materials 被引量:6
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作者 WANG Di DENG Guo-wei +4 位作者 YANG Yong-qiang CHEN Jie WU Wei-hui WANG Hao-liang TAN Chao-lin 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第4期1155-1169,共15页
Functionally graded material(FGM)can tailor properties of components such as wear resistance,corrosion resistance,and functionality to enhance the overall performance.The selective laser melting(SLM)additive manufactu... Functionally graded material(FGM)can tailor properties of components such as wear resistance,corrosion resistance,and functionality to enhance the overall performance.The selective laser melting(SLM)additive manufacturing highlights the capability in manufacturing FGMs with a high geometrical complexity and manufacture flexibility.In this work,the 316L/CuSn10/18Ni300/CoCr four-type materials FGMs were fabricated using SLM.The microstructure and properties of the FGMs were investigated to reveal the effects of SLM processing parameters on the defects.A large number of microcracks were found at the 316L/CuSn10 interface,which initiated from the fusion boundary of 316L region and extended along the building direction.The elastic modulus and nano-hardness in the 18Ni300/CoCr fusion zone decreased significantly,less than those in the 18Ni300 region or the CoCr region.The iron and copper elements were well diffused in the 316L/CuSn10 fusion zone,while elements in the CuSn10/18Ni300 and the 18Ni300/CoCr fusion zones showed significantly gradient transitions.Compared with other regions,the width of the CuSn10/18Ni300 interface and the CuSn10 region expand significantly.The mechanisms of materials fusion and crack generation at the 316L/CuSn10 interface were discussed.In addition,FGM structures without macro-crack were built by only altering the deposition subsequence of 316L and CuSn10,which provides a guide for the additive manufacturing of FGM structures. 展开更多
关键词 selective laser melting multilayer functionally graded material interfacial characterization crack defects mechanical properties
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Preparation and characterization of different surface modified SiCp reinforced Al-matrix composites 被引量:10
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作者 LÜ Pin-hui WANG Xiao-feng +2 位作者 DONG Cui-ge PENG Chao-qun WANG Ri-chu 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第9期2567-2577,共11页
The effects of SiCp surface modifications(Cu coating,Ni coating and Ni/Cu coating)on the microstructures and mechanical properties of Al matrix composites were investigated.Surface modification of SiC particles with C... The effects of SiCp surface modifications(Cu coating,Ni coating and Ni/Cu coating)on the microstructures and mechanical properties of Al matrix composites were investigated.Surface modification of SiC particles with Cu,Ni and Cu/Ni,respectively,was carried out by electroless plating method.SiCp/Al composites were prepared by hot pressed sintering followed by hot extrusion.The results show that the surface modification of SiC particles plays an effective role,which is relative to the type of surface coating,and the interfacial bonding become stronger in the following order:untreated SiCp<Ni(Cu)-coated SiCp<Ni/Cu-coated SiCp.The Ni/Cu-coated SiCp/Al composites exhibit the best comprehensive mechanical properties,with ultimate tensile strength(σUTS)and fracture strain(εf)of 389 MPa and 6.3%,respectively.Compared with that of untreated-SiCp/Al composites,theσUTS andεf are enhanced by 19.3%and 57.5%. 展开更多
关键词 SiCp/Al composite surface modification electroless plating mechanical properties interfacial bonding
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Synthesis and Characterization of Aluminum/Carbon Nanotubes Composites: Study of Interfacial Interaction
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作者 Mananna Barbeno Pasquale Barone +3 位作者 Valentino Pingitore Assunta Bonanno Mariano Davoli FangXu 《Journal of Chemistry and Chemical Engineering》 2013年第4期313-318,共6页
Abstract: In this work, the authors present a study of growth and characterization of composite based on AI and CNT (carbon nanotubes. The composites were prepared by a chemical mixing method and characterized by SE... Abstract: In this work, the authors present a study of growth and characterization of composite based on AI and CNT (carbon nanotubes. The composites were prepared by a chemical mixing method and characterized by SEM analysis, energy dispersed X-ray measurements, X-ray photoelectron spectroscopy and cathodoluminescence spectroscopy. The analysis showed that the composites are formed by macro-cluster of aluminum oxide on a network of CNT without formation of chemical bonds at interface between particles. The results are compared with those obtained for a sample of CNT with AI traces (〈 0.5%). They show that only the presence of metal traces changes the nanotubes optical properties, with a luminescence signal centered at about 380 nm. These luminescence signals are caused by the adhesion between CNT and AI micro-clusters that promote the formation of band gap with some local energy levels. 展开更多
关键词 Carbon nanotubes ALUMINUM interface structure metal-CNT composite.
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Inorganic material passivation of defects toward efficient perovskite solar cells 被引量:4
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作者 Wenjing Qi Xin Zhou +5 位作者 Jiale Li Jian Cheng Yuelong Li Min Jae Ko Ying Zhao Xiaodan Zhang 《Science Bulletin》 SCIE EI CSCD 2020年第23期2022-2032,M0004,共12页
Surface passivation with organic materials is one of the most effective and popular strategies to improve the stability and efficiency of perovskite solar cells(PSCs). However, the secondary bonding formed between org... Surface passivation with organic materials is one of the most effective and popular strategies to improve the stability and efficiency of perovskite solar cells(PSCs). However, the secondary bonding formed between organic molecules and perovskite layers is still not strong enough to protect the perovskite absorber from degradation initialized by oxygen and water attacking at defects. Recently, passivation with inorganic materials has gradually been favored by researchers due to the effectiveness of chemical and mechanical passivation. Lead-containing substances, alkali metal halides, transition elements, oxides,hydrophobic substances, etc. have already been applied to the surface and interfacial passivation of PSCs.These inorganic substances mainly manipulate the nucleation and crystallization process of perovskite absorbers by chemically passivating defects along grain boundaries and surface or forming a mechanically protective layer simultaneously to prevent the penetration of moisture and oxygen, thereby improving the stability and efficiency of the PSCs. Herein, we mainly summarize inorganic passivating materials and their individual passivation principles and methods. Finally, this review offers a personal perspective for future research trends in the development of passivation strategies through inorganic materials. 展开更多
关键词 Perovskite solar cells Inorganic materials passivation Defect healing Stability
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A 3D bounding surface model for rockfill materials 被引量:16
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作者 XIAO Yang LIU HanLong +2 位作者 ZHU JunGao SHI WeiCheng LIU MengCheng 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第11期2904-2915,共12页
A 3D bounding surface model is established for rockfill materials,which can be applied to appropriately predict the deformation and the stabilization of rockfill dams.Firstly,an associated plastic flow rule for rockfi... A 3D bounding surface model is established for rockfill materials,which can be applied to appropriately predict the deformation and the stabilization of rockfill dams.Firstly,an associated plastic flow rule for rockfill materials is investigated based on the elaborate data from the large-style triaxial compression tests and the true triaxial tests.Secondly,the constitutive equations of the 3D bounding surface model are established by several steps.These steps include the bounding surface incorporating the general nonlinear strength criterion,stress-dilatancy equations,the evolution of the bounding surface and the bounding surface plasticity.Finally,the 3D bounding surface model is used to predict the mechanical behaviors of rockfill materials from the large-style triaxial compression tests and the true triaxial tests.Consequently,the proposed 3D bounding surface model can well capture such behaviors of rockfill materials as the strain hardening,the post-peak strain softening,and the volumetric strain contraction and expansion in both two-and three-dimensional stress spaces. 展开更多
关键词 rockf'di material STRENGTH DILATANCY 3D bounding surface constitutive model
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