热处理工艺对累积叠轧Ti/Ni多层复合材料界面结构的影响  

Effect of Heat Treatment on the Interfacial Microstructure of Ti/Ni Multi-layered Composites

作　　者：张志娟 张兵[1] 张诗林 杨晓康 赵田丽[1] 程健 王快社[1] Zhang Zhijuan;Zhang Bing;Zhang Shilin;Yang Xiaokang;Zhao Tianli;Cheng Jian;Wang Kuaishe(College of Metallurgy Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;School of Optoelectronic Engineering,Xi'an Technological University,Xi'an 710021,China;Xi'an Saite Metal Material Development Co.,Ltd,Xi’an 710018,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]西安工业大学光电工程学院,陕西西安710021 [3]西安赛特金属材料开发有限公司,陕西西安710018

出　　处：《稀有金属材料与工程》2020年第9期3153-3162,共10页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51874226);西安科技计划项目(201805033YD11CG17(8));西安建筑科技大学项目(JC1507)。

摘　　要：研究了热处理对累积叠轧6道次Ti/Ni多层复合箔材界面结构演变的影响。利用扫描电镜(SEM)、能谱分析(EDS)、透射电镜(TEM)、X射线衍射(XRD)及差示扫描量热分析(DSC)对热处理后复合材料的界面结构、相组成、相结构及相变温度等进行测试分析。结果表明:随保温时间的增加,Ti/Ni界面扩散形成的不稳定化合物向稳定态转变,界面Ti、Ni两元素成分曲线由交叉陡变的阶梯状逐渐转为两条近平直的平行线。富Ti的Ti/Ni复合箔材在720℃经热处理后,随时间延长,材料组织从原始的层状结构最终转变为由稳态TiNi和Ti2Ni两相组成的混合组织。保温时间小于10 h时,材料中的TiNi是由具有复杂单斜结构的B19’和CsCl型结构的B2两种物相组成,大于10 h时仅存在B19’相。在冷却/加热过程中,材料内部均发生马氏体(A→M/M→A)的可逆相变,并随保温时间的增加,其相变滞后(Ap-Mp)从1 h的22.4℃增加到30 h的31.9℃。The interface evolution of Ti/Ni multi-layered composites produced by six-cycle accumulative roll bonding after heat treatment was investigated.And the interfacial structure,chemical composition and phase transition temperature of Ti/Ni multi-layered composites with different heat treatments were studied by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD)and differential scanning calorimeter(DSC).With the annealing time increasing,the compounds formed by Ti/Ni interface diffusion transform from unstable state to stable state,and the composition curves of Ti and Ni elements in the interface gradually changes from a cross-steep ladder to two nearly straight parallel lines.With time prolonging,the micro structure of Ti-rich Ti/Ni composites treated at 720℃transforms from a regular layered structure to a mixture structure with alternating TiNi and Ti2 Ni layers.When the holding time is less than 10 h,the structure of TiNi phase is composed of B19’with complex monoclinal structure and B2 with CsCl structure,while when the time is more than 10 h,only B19’phase exists.In the process of cooling/heating,a good martensitic and reversible phase transition of A→M/M→A occurs in each sample.With the increase of time,the phase transition hysteresis(Ap-Mp)increases from 22.4℃of the 1 h heat treatment sample to 31.9℃of the 30 h sample.

关 键 词：Ti/Ni多层复合材料 热处理时间 界面结构 相变行为 

分 类 号：TB331[一般工业技术—材料科学与工程]