Larger strain recovery characteristics of Ti-Ni-Hf shape memory alloy composite under compression
Larger strain recovery characteristics of Ti-Ni-Hf shape memory alloy composite under compression
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Ti-Ni-Hf形状记忆合金复合材料压缩下较大应变恢复特性
DOI：
10.1016/j.scriptamat.2018.05.006
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发表时间：
2018-08-01
影响因子：
6
通讯作者：
Zhao, Liancheng
中科院分区：
文献类型：
--
作者：
Yi, Xiaoyang;Meng, Xianglong;Zhao, Liancheng
Ti-Ni-Hf合金复合材料中原位生成的HfC颗粒和TiB晶须构成了准连续网络结构。同时，由于基体中Ti和Hf的贫化，析出了细小且共格的H相。H析出物和准连续网络显微组织共同增强了基体强度，对应力诱发马氏体相变过程中相变应变或应力的调节没有严重的约束或阻碍。结果表明，该复合材料具有上级超弹性，可恢复应变为9.5%，进一步拓宽了其应用领域。(C)2018 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The quasi-continuous network microstructure was constructed by the in-situ HfC particles and TiB whiskers in the Ti-Ni-Hf alloy composite. Meanwhile, the fine and coherent H phase precipitated owing to the depletion of Ti and Hf in the matrix. Both the H precipitates and the quasi-continuous network microstructure jointly enhanced the matrix strength, and had no severe constraint or obstruction on the accommodation of transformation strain or stress during stress-induced martensitic transformation. Thus, the superior superelasticity with the recoverable strain of 9.5% can be obtained in the present Ti-Ni-Hf composite, which further widened their application fields. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.