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MM-W1A立式万能摩擦磨损试验机双显双控的研制
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作者 魏书明 《工程与试验》 2008年第B12期61-62,70,共3页
MM-W1A立式万能摩擦磨损试验机是时代试金集团摩擦磨损研究所最新研制的-种摩擦磨损试验机,它集机械、电子、微机控制于一体,外观新颖,功能齐全。本文介绍了如何用微电子技术和计算机数据处理技术对MM-W1A立式方能摩擦磨损试验机实现数... MM-W1A立式万能摩擦磨损试验机是时代试金集团摩擦磨损研究所最新研制的-种摩擦磨损试验机,它集机械、电子、微机控制于一体,外观新颖,功能齐全。本文介绍了如何用微电子技术和计算机数据处理技术对MM-W1A立式方能摩擦磨损试验机实现数据采集与双显双控,使其试验精度和控制技术达到一个新的高度。 展开更多
关键词 摩擦 磨损 数据采集 双显双控 C++ BUILDER 6.0 串行通讯
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MM-W1B 立式万能摩擦磨损试验机双显双控系统的研发
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作者 张立 张富强 《工程与试验》 2013年第B03期44-46,共3页
MM-W1B立式万能摩擦磨损试验机是济南时代试金试验机有限公司摩擦磨损研发部最新研制的一种全部电气自主知识产权的高端摩擦磨损试验机,该系统响应快,控制精度高,集机械、电子、微机控制于一体,外观新颖,功能齐全。本文介绍了如何用ARM... MM-W1B立式万能摩擦磨损试验机是济南时代试金试验机有限公司摩擦磨损研发部最新研制的一种全部电气自主知识产权的高端摩擦磨损试验机,该系统响应快,控制精度高,集机械、电子、微机控制于一体,外观新颖,功能齐全。本文介绍了如何用ARM微电子技术和PC计算机数据处理技术对MM-W1B立式万能摩擦磨损试验机实现数据采集与双显双控,使该试验机测控技术达到一个新的高度。 展开更多
关键词 双显双控 液晶屏 ARM 串口通讯
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基于上下位机结构的四球摩擦试验机测控系统的研究 被引量:4
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作者 陈召宝 刘莹 王宗斌 《试验技术与试验机》 2008年第1期35-38,共4页
四球摩擦试验机是国际上普遍使用的润滑剂模拟评定试验设备,本文通过分析国内外四球摩擦试验机测控技术特点与现状,提出了"基于上下位机结构的四球摩擦试验机测量控制系统"方案,并详细的阐述了上下位机测控系统的实现原理及过... 四球摩擦试验机是国际上普遍使用的润滑剂模拟评定试验设备,本文通过分析国内外四球摩擦试验机测控技术特点与现状,提出了"基于上下位机结构的四球摩擦试验机测量控制系统"方案,并详细的阐述了上下位机测控系统的实现原理及过程,同时简述了利用该方案设计制造的MRS-10D微机控制四球摩擦试验机的结构特点及工作原理。 展开更多
关键词 四球机 微机控制 电液伺服 上下位机通讯 双显
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准确判断遗传规律,提高解题效率
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作者 曹琪 《克拉玛依学刊》 1997年第1期89-90,共2页
本文主要介绍如何准确而快速的判断,在遗传学中,两对或两对以上相对性状的杂交遗传,是遵循的什么样的遗传规律.
关键词 判断 遗传规律 双显性个体≠双隐性个体数 如果双显=双隐 则有A显=B显显=B显
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基于实时混合试验误差累积规律的时滞影响修正方法 被引量:3
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作者 周子豪 李宁 李忠献 《工程力学》 EI CSCD 北大核心 2021年第6期121-132,共12页
为减小实时混合试验中的时滞影响,通常要对数值子结构计算得到的控制指令进行在线时滞补偿。为了保障实时性,要求作动器的负载不宜过大并处于最佳的性能区间。由于大比尺实时混合试验中物理子结构负载较大,对控制系统和作动器性能都提... 为减小实时混合试验中的时滞影响,通常要对数值子结构计算得到的控制指令进行在线时滞补偿。为了保障实时性,要求作动器的负载不宜过大并处于最佳的性能区间。由于大比尺实时混合试验中物理子结构负载较大,对控制系统和作动器性能都提出较高的要求。此外,目前时滞补偿算法是无法完全消除时滞影响的,也即,时滞普遍存在于实时混合试验中且无法避免。针对上述问题,基于双显式数值积分算法的误差累积规律,该文提出了一种可以在试验后对试验结果进行修正以消除时滞不利效应的方法。分析了时滞对于实时混合试验结果的影响,对较大时滞情况下,尽管系统稳定,但可能得到“错误”的试验结果;通过理论推导,证明提出方法的合理性和适用性;通过4种实时混合试验工况的模拟,验证物理子结构分别为线性刚度、线性阻尼、非线性刚度及非线性阻尼构件的时滞修正效果。结果表明:所提出的方法可以显著降低时滞对于试验结果的影响;该方法对试验中时滞补偿效果不理想的情况,可以对位移、速度和加速度结果进行修正。 展开更多
关键词 实时混合试验 时滞 误差累积 双显式积分算法 后处理
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我们能为DVR的发展做什么
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《微计算机信息》 北大核心 2005年第09X期190-190,共1页
DVR是Digital Video Recorder的缩写。中文意思是数字影像录像系统。近年来,DVR因性能稳定、数据查找迅速、交换方便、价格相对较低等优势迅速替代了以模拟技术为主导的传统监控系统(摄像机,录像机,磁带等),并广泛地应用于智能楼... DVR是Digital Video Recorder的缩写。中文意思是数字影像录像系统。近年来,DVR因性能稳定、数据查找迅速、交换方便、价格相对较低等优势迅速替代了以模拟技术为主导的传统监控系统(摄像机,录像机,磁带等),并广泛地应用于智能楼宇、金融机构、居民住宅、公共设施、大型超市、工业生产现场、以及道路交通、海关等监控领域。 展开更多
关键词 DVR 数字影像录像系统 实时监控系统 远程控制 双显功能 数据传输
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太阳系形成的猜想
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作者 金文龙 《科学之友》 2001年第7期13-13,共1页
太阳系是如何形成的?迄今各类假说有30多个,其中有星云说,也有双星说.拉普拉斯于18世纪末所提出的星云说被认为太阳系起源的问题已被解决,但是后来又被证明是错误的,由于角动量问题的无法解决,英国天文学家兼科普作家金斯于20世纪初提... 太阳系是如何形成的?迄今各类假说有30多个,其中有星云说,也有双星说.拉普拉斯于18世纪末所提出的星云说被认为太阳系起源的问题已被解决,但是后来又被证明是错误的,由于角动量问题的无法解决,英国天文学家兼科普作家金斯于20世纪初提出有关太阳系起源的双星假说,太阳系是由于另一颗星的作用而形成的,这个假说很好地解决了太阳系角动量的问题,但是由于找不到更多的证据和太阳系现状的同一性问题,人们又转而认为太阳系是由一团星云形成的,这就是目前的普遍看法,但是太阳系起源的问题仍然没有最终得到解决. 展开更多
关键词 太阳系 起源 双显假说 角动量 科里奥利效应
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Tailoring phase fractions of T'and η' phases in dual-phase strengthened Al−Zn−Mg−Cu alloy via ageing treatment 被引量:2
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作者 Yan ZOU Xiao-dong WU +2 位作者 Song-bai TANG Kai ZHAO Ling-fei CAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第10期3182-3196,共15页
Hardness tests and transmission electron microscopy were used to investigate the strategy of tailoring the phase fraction of precipitates in an Al-Zn-Mg-Cu alloy strengthened by T’ and η’ phases. Different phase fr... Hardness tests and transmission electron microscopy were used to investigate the strategy of tailoring the phase fraction of precipitates in an Al-Zn-Mg-Cu alloy strengthened by T’ and η’ phases. Different phase fractions of T’ and η’ phases are presented in samples subjected to either single or two stages of ageing treatments at 120 and 150 ℃.For both types of ageing, the precipitation of η’ phase is found to be promoted by ageing at lower temperature and its phase fraction increases with prolonging ageing time at 120 ℃;whereas the phase fractions of T’ and η’ phases almost remain constant during ageing at 150 ℃. Besides, the strain fields produced by T’ and η’ phases were analyzed by using the geometric phase analysis technique, and on a macroscale the contributions of T’ and η’ phases to precipitation strengthening have been quantitatively predicted by combining the size, phase fraction and number density of precipitates. 展开更多
关键词 Al−Zn−Mg−Cu alloy ageing behavior microstructure dual-phase strengthening
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Butt joining of Al-Cu bilayer sheet through friction stir welding 被引量:2
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作者 R.BEYGI M.KAZEMINEZHAD A.H.KOKABI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第12期2925-2929,共5页
Butt joining of Al–Cu bilayer sheet produced by cold roll bonding was studied through friction stir welding (FSW). A defect free joint was obtained. Flow patterns and mixing of two layers during FSW were investigated... Butt joining of Al–Cu bilayer sheet produced by cold roll bonding was studied through friction stir welding (FSW). A defect free joint was obtained. Flow patterns and mixing of two layers during FSW were investigated. Microstructural investigations and hardness profile measurements were carried out. It is shown that material flow in stir zone leads to the formation of banding structure in Cu layer at advancing side. Traces of Al particles along with Al–Cu intermetallic compounds exist in the fined grain region of this banding structure which leads to higher hardness values. 展开更多
关键词 bilayer sheet Al-Cu sheet friction stir welding MICROSTRUCTURE
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Microstructure and mechanical properties of rutile-reinforced AA6061 matrix composites produced via stir casting process 被引量:2
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作者 Subramanya R.PRABHU Arun K.SHETTIGAR +1 位作者 Mervin A.HERBERT Shrikantha S.RAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第11期2229-2236,共8页
A novel process of fabricating aluminium matrix composites(AMCs)with requisite properties by dispersing rutile particles in the aluminum matrix was studied.A novel bi-stage stir casting method was employed to prepare ... A novel process of fabricating aluminium matrix composites(AMCs)with requisite properties by dispersing rutile particles in the aluminum matrix was studied.A novel bi-stage stir casting method was employed to prepare composites,by varying the mass fractions of the rutile particles as 1%,2%,3%and 4%in AA6061 matrix.The density,tensile strength,hardness and microstructures of composites were investigated.Bi-stage stir casting method engendered AMCs with uniform distribution of the reinforced rutile particles in the AA6061 matrix.This was confirmed by the enhancement of the properties of AMCs over the parent base material.Rutile-reinforced AMCs exhibited higher tensile strength and hardness as compared with unreinforced parent material.The properties of the composites were enhanced with the increase in the mass fraction of the rutile particles.However,beyond 3 wt.%of rutile particles,the tensile strength decreased.The hardness and tensile strength of the AMCs reinforced with 3 wt.%of rutile were improved by 36%and 14%respectively in comparison with those of matrix alone. 展开更多
关键词 AA6061-rutile composite bi-stage stir casting microstructure mechanical properties FRACTOGRAPHY
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Experimental research on electromagnetic continuous casting high-speed steel composite roll 被引量:4
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作者 李国军 冯明杰 《Journal of Central South University》 SCIE EI CAS 2014年第3期849-856,共8页
A high speed steel composite roll billet was fabricated, which is regular in shape, smooth in surface, slight in trace, compact in internal structure, free of slag inclusion, shrinkage cavity, cracks and other flaws, ... A high speed steel composite roll billet was fabricated, which is regular in shape, smooth in surface, slight in trace, compact in internal structure, free of slag inclusion, shrinkage cavity, cracks and other flaws, and good in macro quality of junction surface using a vertical continuous casting machine. The interface zone microstructure of bimetallic in billet of high speed steel composite roll was analyzed by metallurgical microscope(OM), X-ray diffractmeter(XRD), scanning electron microscopy(SEM) and energy-dispersive X-ray analysis(EDS). The results indicate that the microstructure of roll billet is composed of chilled solidified layer, dendrite zone, interfacial zone of bimetal and core material zone. The microstructure of outer shell material is composed of martensite + bainite + residual austenite + some small labyrinth-shape, small-short lath-shape, or dollop-shape eutectic carbides. The microstructure of core material is slice-shape pearlite and a little ferrite along boundary of cells. The interface region microstructure of bimetallic composite roll consists of diffusion region, chilled solidified layer and columnar grain region. 展开更多
关键词 high speed steel composite roll continuous casting interface of bimetal composite CARBIDE
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Theoretical and experimental studies on fabrication of two-layer aluminum−copper pipe by friction stir additive manufacturing
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作者 Mehdi FALAHATI NAQIBI Majid ELYASI +1 位作者 Hamed JAMSHIDI AVAL Mohammad Javad MIRNIA 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第12期3643-3658,共16页
Using a friction stir additive manufacturing(FSAM)process,the fabrication of a two-layer aluminum−copper pipe was studied experimentally and numerically.For this purpose,by presenting a 3D thermo-mechanical model in A... Using a friction stir additive manufacturing(FSAM)process,the fabrication of a two-layer aluminum−copper pipe was studied experimentally and numerically.For this purpose,by presenting a 3D thermo-mechanical model in ABAQUS software,the temperature and strain distributions during the process were studied.The simulation results show that,although the rotational-to-traverse speed ratio with a good approximation can predict the heat input during welding,it is not a precise measure to predict the occurrence of defects in the weld cross-section.There is a good agreement between the predicted and experimental thermal results,and the maximum relative error is 4.1%in estimating the maximum temperature during welding.Due to heat and severe plastic deformation in the stir zone,the aluminum−copper intermetallic compounds(CuAl_(2) and Cu_(9)Al_(4))are formed.The maximum hardness in the stir zone is 301.4 HV_(0.1) in sample welded with an overlap of−0.5 mm.The ultimate tensile strength and elongation of the two-layer pipe fabricated by friction stir additive manufacturing are(319.52±2.31)MPa and 19.47%,respectively. 展开更多
关键词 friction stir welding thermo-mechanical simulation two-layer Al−Cu pipes microstructure mechanical properties
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A case of small bowel adenocarcinoma in a patient with Crohn’s disease detected by PET/CT and double-balloon enteroscopy 被引量:3
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作者 Chise Kodaira Satoshi Osawa +9 位作者 Chihiro Mochizuki Yoshihiko Sato Masafumi Nishino Takanori Yamada Yasuhiro Takayanagi Kosuke Takagaki Ken Sugimoto Shigeru Kanaoka Takahisa Furuta Mutsuhiro Ikuma 《World Journal of Gastroenterology》 SCIE CAS CSCD 2009年第14期1774-1778,共5页
Small bowel adenocarcinoma (SBA) in patients with Crohn’s disease (CD) is quite rare, difficult to diagnose without surgery, and has a poor prognosis. Here, we report a 48-year-old man with SBA and a 21-year history ... Small bowel adenocarcinoma (SBA) in patients with Crohn’s disease (CD) is quite rare, difficult to diagnose without surgery, and has a poor prognosis. Here, we report a 48-year-old man with SBA and a 21-year history of CD who was diagnosed by a combination of positron emission tomography/computed tomography (PET/CT) and double-balloon enteroscopy (DBE). Since the age of 27 years, the patient had been treated for ileal CD and was referred to our hospital with persistent melena. Multiple hepatic tumors were found by CT. PET/CT detected an accumulation spot in the small bowel. DBE revealed an ulcerative tumor in the ileum about 100 cm from the ileocecal valve. An endoscopic forceps biopsy specimen showed poorly differentiated adenocarcinoma. There were some longitudinal ulcer scars near the tumor, and the chronic inflammation inthe small bowel appeared to be associated with the cancer development. Previous reports suggest the risk of SBA in patients with CD is higher than in the overall population. Since early diagnosis is extremely difficult in these cases, novel techniques, such as PET/CT and DBE, may be expected to help in making a preoperative diagnosis of the development of SBA in CD. 展开更多
关键词 Crohn's disease Double-balloon enteroscopy Positron emission tomography Small bowel adeno-carcinoma SURVEILLANCE
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Hydrophobic intensification flotation:Comparison of collector containing two minerophilic groups with conventional collectors 被引量:14
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作者 Sheng LIU Guang-yi LIU +1 位作者 Yao-guo HUANG Hong ZHONG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第9期2536-2546,共11页
The surface hydrophobization and flotation of a xanthate−hydroxamate collector toward copper oxide mineral were compared with the combined collectors of xanthate and hydroxamate through water contact angle(WCA)and mic... The surface hydrophobization and flotation of a xanthate−hydroxamate collector toward copper oxide mineral were compared with the combined collectors of xanthate and hydroxamate through water contact angle(WCA)and micro-flotation experiments.The results showed that S-[(2-hydroxyamino)-2-oxoethyl]-O-octyl-dithiocarbonate ester(HAOODE)exhibited stronger hydrophobization and better flotation performance to malachite(Cu2(OH)2CO3)than octyl-hydroxamic acid(OHA)and its combination with S-allyl-O-ethyl xanthate ester(AEXE).To understand the hydrophobic intensification mechanism of HAOODE to malachite,zeta potential,atomic force microscopy(AFM)and XPS measurements were carried out.The results recommended that malachite chemisorbed HAOODE to form Cu—HAOODE complexes in which the hydroxamate—(O,O)—Cu and—O—C(—S—Cu)—S—configurations co-existed.The co-adsorption of HAOODE’s hetero-difunctional groups was more stable than the single-functionalgroup adsorption of OHA and AEXE,which produced the“loop”structure and intensified the self-assembly alignment of HAOODE on malachite surfaces.In addition,the“h”shape steric orientation of the double hydrophobic groups in HAOODE facilitated stronger hydrophobization toward malachite than the“line”or“V”hydrophobic carbon chains of OHA or AEXE.Thus,HAOODE achieved the preferable flotation recovery of malachite particles in comparison with OHA and AEXE. 展开更多
关键词 S-[(2-hydroxyamino)-2-oxoethyl]-O-octyl-dithiocarbonate ester atomic force microscopy(AFM) heterodifunctional co-adsorption HYDROPHOBIZATION malachite flotation
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Process optimization,microstructures and mechanical/thermal properties of Cu/Invar bi-metal matrix composites fabricated by spark plasma sintering 被引量:8
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作者 Qiang-qiang NIE Guo-hong CHEN +2 位作者 Bing WANG Lei YANG Wen-ming TANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第10期3050-3062,共13页
An orthogonal experiment scheme was designed to investigate the effects of the Cu content,compaction pressure,and sintering temperature on the microstructures and mechanical and thermal properties of(30−50)wt.%Cu/Inva... An orthogonal experiment scheme was designed to investigate the effects of the Cu content,compaction pressure,and sintering temperature on the microstructures and mechanical and thermal properties of(30−50)wt.%Cu/Invar bi-metal matrix composites fabricated via spark plasma sintering(SPS).The results indicated that as the Cu content increased from 30 to 50 wt.%,a continuous Cu network gradually appeared,and the density,thermal conductivity(TC)and coefficient of thermal expansion of the composites noticeably increased,but the tensile strength decreased.The increase in the sintering temperature promoted the Cu/Invar interface diffusion,leading to a reduction in the TC but an enhancement in the tensile strength of the composites.The compaction pressure comprehensively affected the thermal properties of the composites.The 50wt.%Cu/Invar composite sintered at 700℃ and 60 MPa had the highest TC(90.7 W/(m·K)),which was significantly higher than the TCs obtained for most of the previously reported Cu/Invar composites. 展开更多
关键词 spark plasma sintering(SPS) Cu/Invar bi-metal composite microstructure interface diffusion mechanical property thermal property
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A Generalized Hirota Ansatz to Obtain Soliton-Like Solutions for a (3+l)-Dimensional Nonlinear Evolution Equation 被引量:1
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作者 吴建平 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第8期297-300,共4页
Instead of the usual Hirota ansatz,i.e.,the functions in bilinear equations being chosen as exponentialtypes,a generalized Hirota ansatz is proposed for a (3+1)-dimensional nonlinear evolution equation.Based on theres... Instead of the usual Hirota ansatz,i.e.,the functions in bilinear equations being chosen as exponentialtypes,a generalized Hirota ansatz is proposed for a (3+1)-dimensional nonlinear evolution equation.Based on theresulting generalized Hirota ansatz,a family of new explicit solutions for the equation are derived. 展开更多
关键词 (3+1)-dimensional nonlinear evolution equation bilinear method generalized Hirota ansatz exponential type functions soliton-like solutions
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Explicit Soliton and Periodic Solutions to Three-Wave System with Quadratic and Cubic Nonlinearities
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作者 林机 赵丽娜 李画眉 《Communications in Theoretical Physics》 SCIE CAS CSCD 2011年第4期676-680,共5页
Lie group theoretical method and the equation of the Jacobi elliptic function are used to study the three wave system that couples two fundamental frequency (FF) and a single second harmonic (SH) one by competing... Lie group theoretical method and the equation of the Jacobi elliptic function are used to study the three wave system that couples two fundamental frequency (FF) and a single second harmonic (SH) one by competing X^(2) (quadratic) and X^(3) (cubic) nonlinearities and birefringence. This system shares some of the nice properties of soliton system. On the phase-locked condition; we obtain large families of analytical solutions as the soliton, kink and periodic solutions of this system. 展开更多
关键词 optical soliton Lie group symmetry competing nonlinearity
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Malignant biphasic tumor of the uterus: A case report and review
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作者 Umesh Das Vishwanath Sathyanarayanan +2 位作者 Nagesh Taterao Sirsath Champaka G Lakshmaiah Kuntejowdahalli Channaviriappa 《The Chinese-German Journal of Clinical Oncology》 CAS 2013年第5期249-251,共3页
We present a rare case of a 50-year old lady who presented with pain abdomen and bleeding per vaginum of 3 months duration. Per vaginal examination revealed an exophytic growth arising from vault. Histopathological ex... We present a rare case of a 50-year old lady who presented with pain abdomen and bleeding per vaginum of 3 months duration. Per vaginal examination revealed an exophytic growth arising from vault. Histopathological examination of the vault biopsy showed malignant neoplasm with features suggestive of carcinosarcoma of vault with immunohistochemistry showing stromal cells positive for CD10 and negative for SMA. Ki67 index was 40%-50%. She received external beam radiotherapy to pelvis 50.4 Gy/25 fractions but did not respond to the same. The lesion was not surgically resectable and hence referred to the division of medical oncology for chemotherapy. She was started on ifosphamide with cisplatin with growth factor support. It was planned to do a reassessment after 3 cycles of chemotherapy, but patient succumbed to the illness. 展开更多
关键词 cercinosercome UTERUS VAULT
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Synthesis and biochemical properties of fluorescent/magnetic bifunctional starch particles 被引量:1
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作者 王凤华 刘俊 +6 位作者 唐冬英 薛昌刚 肖苏尧 郑元青 童春义 王玲玲 刘选明 《Journal of Central South University》 SCIE EI CAS 2010年第2期211-217,共7页
Magnetic starch particles (MSPs) were synthesized in water-in-oil mieroemulsion at room temperature. MSPs were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectrometry (FTI... Magnetic starch particles (MSPs) were synthesized in water-in-oil mieroemulsion at room temperature. MSPs were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectrometry (FTIR), zeta potential system, thermogravimetric analysis (TGA) and vibrating sample magnetometry (VSM). The average diameter of the MSPs was 220 nm, dispersed with well-proportioned size and magnetic resonance, the saturation magnetization was 3.64 A.mR/kg. MSP was coated with poly-L-lysine (PLL), and then the surface of PLL-MSP was combined with fluorescein isothiocynate (FITC). Results show that fluorescent/magnetic starch particles (FMSPs) are of stable photo-bleaching capability compared with free FITC, with low bio-toxicity and certain function of magnetic separation. It is expected that FMSPs are bifimctional nano-materials including fluorescence labelling and magnetic separation. 展开更多
关键词 starch-particles NANO-MATERIALS SYNTHESIS fluorescent properties magnetic properties biochemical properties
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Effect of duplex aging on microstructure and mechanical properties of near-βtitanium alloy processed by isothermal multidirectional forging 被引量:4
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作者 Chang-jiang ZHANG Xi JIANG +5 位作者 Zhi-dan LÜ Hong FENG Shu-zhi ZHANG Ying XU Muhammad Dilawer HAYAT Peng CAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第4期1159-1168,共10页
The effects of sub-transus(α+β)annealing treatment(ST),followed by single aging(SA)or duplex aging(DA)on the microstructural evolution and mechanical properties of near-βTi-4Al-1Sn-2Zr-5Mo-8V-2.5Cr(mass fraction,%)... The effects of sub-transus(α+β)annealing treatment(ST),followed by single aging(SA)or duplex aging(DA)on the microstructural evolution and mechanical properties of near-βTi-4Al-1Sn-2Zr-5Mo-8V-2.5Cr(mass fraction,%)alloy were investigated using optical microscopy,scanning electron microscopy,and transmission electron microscopy.The results show that the finer secondaryαphase precipitates in the alloy after DA than SA(e.g.,149 nm for SA and 69 nm for DA,both after ST at 720℃).The main reason is that the pre-aging step(300℃)in the DA process leads to the formation of intermediateωphase nanoparticles,which assist in the nucleation of the acicular secondaryαphase precipitates.In addition,the strength of the alloy after DA is higher than that of SA at the specific ST temperature.A good combination is achieved in the alloy subjected to ST at 750℃,followed by DA(UTS:1450 MPa,EL:3.87%),which is due to the precipitation of nanoscale secondaryαphase by DA.In conclusion,DA is a feasible process for this new near-βtitanium alloy. 展开更多
关键词 new near-βtitanium alloy multidirectional forging annealing treatment duplex aging ω-assistedαnucleation microstructure mechanical properties
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