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

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作者：
Zhang, Zhijuan [1 ]
Zhang, Bing [1 ]
Zhang, Shilin [2 ]
Yang, Xiaokang [3 ]
Zhao, Tianli [1 ]
Cheng, Jian [1 ]
Wang, Kuaishe [1 ]
机构：
[1] College of Metallurgy Engineering, Xi'an University of Architecture and Technology, Xi'an,710055, China
[2] School of Optoelectronic Engineering, Xi'an Technological University, Xi'an,710021, China
[3] Xi'an Saite Metal Material Development Co., Ltd, Xi'an,710018, China
来源：
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | 2020年 / 49卷 / 09期
关键词：
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 microstructure of Ti-rich Ti/Ni composites treated at 720 °C transforms from a regular layered structure to a mixture structure with alternating TiNi and Ti2Ni 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. © 2020; Science Press. All right reserved;
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页码：3153 / 3162
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