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Slip behavior of Bi-modal structure in a metastable β titanium alloy during tensile deformation

Journal of Materials Science & Technology 2020年第22期54卷 188-196页

作者： Wenguang Zhu Changsheng Tan Ruoyu Xiao qiaoyan sun Jun sun State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an.710049China School of Materials Science&Engineering Xi'an University of TechnologyXi'an710048China

β titanium alloys with bi-modal structure which exhibit improved strength-ductility combination and fatigue property are widely used in aviation and aerospace ***,owing to the small size of primary α(αp) and nano-scaled multi variant distribution of secondary α platelets(αs),investigating the deformation behavior is really a challenging *** this work,by applying transmission electron microscopy(TEM),the slip behavior in αp and transformed β matrix with different tensile strain was *** α/β solution treatment,the initial dislocation slips on {110} plane with direction in β *** furtherdeformation,(110),(101) and(1 1 2) multi slip is generated which shows a long straight cro s sing *** cell is exhibited in β matrix at tensile strain above 20 %.Diffe rent from the solid solution treated sample,high density wavy dislocations are generated in transformedβ *** fraction fine as hinders dislocation motion in β matrix effectively which in turn dominates the strength of the *** primary α phase(αp),a core-shell structure is formed during *** pyramidal a+c slip and prismatic/basal a slip are generated in the shell *** core region,plastic deformation is governed by prismatic/basal a *** of the core-shell structure is the physical origin of the improved *** one hand,the work hardening layer(shell) improves the strength of αp,which could deform compatibly with the hard transformed β ***,the center area(core) deforms homogeneously which will sustain plastic strain effectively and increase the *** paper studies the slip behavior and reveals the origin of the improved strength-ductility combination in Bi-modal structure on a microscopic way,which will give theoretical advises for developing the next generation high strength β titanium alloys.

关键词： βTitanium alloy Plastic deformation Slip behavior Bi-modal structure Core-shell structure

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A novel pairing-free certificateless authenticated key agreement protocol with provable security

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Frontiers of Computer Science 2013年第4期7卷 544-557页

作者： Haiyan sun qiaoyan WEN Hua ZHANG Zhengping JIN State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

Recently, He et al. （Computers and Mathematics with Applications, 2012） proposed an efficient pairing-free certificateless authenticated key agreement （CL-AKA） protocol and claimed their protocol was provably secure in the extended Canetti-Krawczyk （eCK） model. By giving concrete attacks, we indicate that their protocol is not secure in the eCK model. We propose an improved protocol and show our improvement is secure in the eCK model under the gap DiffieHellman （GDH） assumption. Furthermore, the proposed protocol is very efficient.

关键词： attacks pairings eCK model provable security,certificateless authenticated key agreement

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In situ scanning electron microscopy observation of deformation and fracture behavior of Ti-3Zr-2Sn-3Mo-25Nb alloy

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Rare Metals 2012年第4期31卷 318-322页

作者： Ma, Xiqun Yu, Zhentao Han, Yong Song, Xiping sun, qiaoyan Northwest Institute for Nonferrous Metal Research Xi'an 710016China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeiiing 100083China

The plastic deformation and fracture processes of Ti-3Zr-2Sn-3Mo-25Nb alloy for surgical implants were directly observed by in situ scanning electron microscopy(SEM).The effect of phase transformations on deformation-induced martensitic transformation accompanying the cyclic tensile fracture processes was *** results reveal that the metastable alpha martensites(α″) promotes deformation-induced martensitic transformation to ductile fracture,whereas the omega(ω) and alpha(α) phases drastically prevent slip dislocation and deformation-induced martensitic transformation to brittle fracture.

关键词： titanium alloys metastable phases martensitic phase transformation deformation

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Deformation mechanisms in aβ-quenched Ti-5321 alloy:In-situ investigation related to slip activity,orientation evolution and stress induced martensite

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Journal of Materials Science & Technology 2022年第17期112卷 36-48页

作者： Cong Wu Qinyang Zhao Shixing Huang Yongqing Zhao Lei Lei Junqiang Ren qiaoyan sun Lian Zhou State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi’an 710049China School of Material Science and Engineering Chang'an UniversityXi’an 710064China Northwest Institute for Non-ferrous Metal Research Xi’an 710016China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China

The deformation behavior ofβ-quenched nearβTi-5321(Ti-5Al-3Mo-3V-2Cr-2Zr-1Nb-1Fe)alloy was systematically studied using in-situ tensile test monitored by the scanning electron microscopy(SEM).Besides,the electron backscatter diffraction(EBSD)was performed to thoroughly discuss the deformation *** results indicated that slip activities,crystal rotation and stress induced martensite transformation were the major deformation mechanisms in theβ-quenched Ti-5321 alloy during in-situ tensile *** slip activities were investigated by using the EBSD-trace analysis,which demonstrated that{110},{112}and{123}slip systems were activated and the{110}slip system ***,βgrains rotated about 7.8°to accommodate the increased ***,the stress induced martensiteα″which was related to the double yielding behavior during tensile process exhibited multiple *** differentα″variants divided theβmatrix into smallerβblocks with a typical zigzag morphology,in which oneα″variant passed through another one by deflecting its initial growth ***,the deformation twinning in martensiteα″and slip bands cutting through martensiteα″effectively accommodated the local *** systematically analysis can provide insightful information about the deformation mechanisms in nearβtitanium alloys.

关键词： In-situ tensile test Slip activity Stress induced martensite Titanium alloys

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New insights in the development ofαphase during continuously heating in aβ-quenched Ti-5321 alloy

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Journal of Materials Science & Technology 2022年第8期103卷 29-33页

作者： Cong Wu Qinyang Zhao Shixing Huang Yongqing Zhao Lei Lei qiaoyan sun Lian Zhou State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Northwest Institute for Non-ferrous Metal Research Xi’an 710016China School of Material Science and Engineering Chang’an UniversityXi’an 710064China

Near β titanium alloys are attractive materials for aeronautical applications due to their high specific strength,excellent damage tolerance performance and good *** mechanical properties are strongly governed by the microstructural characteristics,especially the morphology,volume fraction,orientation and distribution of theαphase.

关键词： αphase alloy alloys

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Heterogeneous precipitate microstructure in titanium alloys for simultaneous improvement of strength and ductility

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Journal of Materials Science & Technology 2022年第29期124卷 150-163页

作者： Mengyuan Hao Pei Li Xuexiong Li Tianlong Zhang Dong Wang qiaoyan sun Libin Liu Jinshan Li Yuyou Cui Rui Yang Dongsheng Xu Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Thermal Power Research Institute Co.Ltd. Xi’an 710032China

The design of alloys with simultaneous high strength and high ductility is still a difficult ***,we propose a new approach to designing multi-phase alloys with a synergistic combination of strength and ductility by engineering heterogeneous precipitate microstructures through the activation of different transformation *** a two-phase titanium alloy as an example,phase field simulations are carried out firstly to design heat treatment schedules that involve both conventional nucleation and growth and non-conventional pseudospinodal decomposition mechanisms,and the calculated microstructures have been evaluated by crystal plasticity finite element *** to simulations,we then set a two-step heat treatment to produce bimodalα+βmicrostructure in *** mechanical testing shows that the ductility of the alloy is increased by~50%and the strength is increased by~10%as compared to its unimodal *** work may provide a general way to improve the mechanical properties of alloys through multiscale microstructure design.

关键词： Titanium alloys Phase field simulation Crystal plasticity finite element Two-step aging Pseudospinodal decomposition mechanisms Multiscale heterogeneous microstructure

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施密特因子分布图预测锆的变形行为（英文）

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稀有金属材料与工程 2019年第8期48卷 2400-2405页

作者：辛超孙巧艳肖林孙军西安交通大学金属材料强度国家重点实验室

由拉伸应力方向与c轴夹角及拉伸应力方向在基面投影与基面a轴夹角为自变量绘制了锆及锆合金中不同变形方式的施密特因子分布图并做了分析和研究。变形方式包括基面滑移,柱面滑移和锥面滑移的和滑移系和{1012},{1121},{1122}和{1011}4组... 详细信息

由拉伸应力方向与c轴夹角及拉伸应力方向在基面投影与基面a轴夹角为自变量绘制了锆及锆合金中不同变形方式的施密特因子分布图并做了分析和研究。变形方式包括基面滑移,柱面滑移和锥面滑移的和滑移系和{1012},{1121},{1122}和{1011}4组孪晶系。每个独立变形方式下的软取向和硬取向被确定。施密特因子分布图结合实验中每种变形方式的临界剪切应力可以有效预测每种变形方式的相对活性并能够很好地吻合现有的实验结果。

关键词：施密特定律滑移孪晶变体选择各向异性锆

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百万千瓦级核电厂超设计基准事故对策分析

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核动力工程 2017年第3期38卷 154-157页

作者：陈巧艳孙婧中国核电工程有限公司北京100840

以小破口失水事故(SBLOCA)为例,使用RELAP5和MAAP程序,计算超设计基准事故不同情况下操纵员操作时间窗口。计算结果表明:堆芯未熔化情况下,SBLOCA时执行充-排操作的时间窗口为1800 s,安全壳喷淋手动开启时间窗口为5400 s。严重事故情况... 详细信息

以小破口失水事故(SBLOCA)为例,使用RELAP5和MAAP程序,计算超设计基准事故不同情况下操纵员操作时间窗口。计算结果表明:堆芯未熔化情况下,SBLOCA时执行充-排操作的时间窗口为1800 s,安全壳喷淋手动开启时间窗口为5400 s。严重事故情况下,操纵员需要对一回路卸压,针对二代改进型压水堆核电厂,避免堆芯熔化的时间窗口为300 s,避免压力容器损坏的时间窗口为3000 s。通过计算分析,给出设计扩展工况不同情况下安全设施需求及操纵员操作时间窗口。

关键词：小破口超设计基准事故一级PSA 事故规程

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双重时效对Ti1023合金低周疲劳行为的影响

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稀有金属材料与工程 2012年第11期41卷 1911-1916页

作者：陈威孙巧艳肖林孙军西安交通大学强度与振动教育部重点实验室陕西西安710049 西安交通大学金属材料强度国家重点实验室陕西西安710049

研究了双重时效对Ti-10V-2Fe-3Al合金低周疲劳行为的影响。结果显示,高应变幅(△εt/2=1.5%,1.2%,1.0%)下,合金表现为循环软化;低应变幅(△εt/2=0.8%,0.6%)下,则表现为循环应力饱和。疲劳寿命测试结果表明,双重时效疲劳寿命和直接时效... 详细信息

研究了双重时效对Ti-10V-2Fe-3Al合金低周疲劳行为的影响。结果显示,高应变幅(△εt/2=1.5%,1.2%,1.0%)下,合金表现为循环软化;低应变幅(△εt/2=0.8%,0.6%)下,则表现为循环应力饱和。疲劳寿命测试结果表明,双重时效疲劳寿命和直接时效疲劳寿命相当,疲劳总应变幅和疲劳寿命满足Coffin-Manson方程。SEM断口形貌显示,双重时效后疲劳裂纹稳定扩展区有明显的疲劳条纹,疲劳裂纹以穿晶方式扩展,并伴随着撕裂棱和二次裂纹,但二次裂纹较直接时效大量减少。TEM形貌显示,不论是双重时效还是直接时效,疲劳后变形组织都很均匀。虽然双重时效和直接时效具有相当的疲劳寿命,但是这种工艺缩短了时效时间,节约了能源,能更好地满足实际工业生产需求。

关键词： Ti-10V-2Fe-3Al合金时效低周疲劳微观组织

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表面机械滚压对Zr-4合金组织和力学性能的影响

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稀有金属材料与工程 2017年第7期46卷 1954-1960页

作者：辛超徐巍孙巧艳肖林孙军西安交通大学金属材料强度国家重点实验室陕西西安710049

采用表面机械滚压对退火态Zr-4合金进行表面纳米化处理并对其微观组织和力学性能开展了系统研究。滚压处理在Zr-4合金表面形成纳米/超细晶及变形层的厚度与滚压道次、每道次滚压深度有关;对Zr-4合金优化后的滚压参数为每道次滚压深度40... 详细信息

采用表面机械滚压对退火态Zr-4合金进行表面纳米化处理并对其微观组织和力学性能开展了系统研究。滚压处理在Zr-4合金表面形成纳米/超细晶及变形层的厚度与滚压道次、每道次滚压深度有关;对Zr-4合金优化后的滚压参数为每道次滚压深度40μm、滚压8道次,获得从表面到心部由纳米晶、超细晶、变形组织和心部原始粗晶连续梯度变化的组织形貌,其纳米/超细晶层的厚度约为100μm,变形层的厚度约为300μm。Zr-4合金经滚压处理后,表层显微硬度显著提高;屈服强度和抗拉强度分别为352和600 MPa,各提高了7%和9%,延伸率略有降低。用混合法则计算了Zr-4合金表面滚压处理后的屈服强度,与实验值吻合。

关键词： Zr-4合金表面纳米化力学性能表面机械滚压

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