Influence of Zr content on phase formation, transition and mechanical behavior of Ni-Ti-Hf-Zr high temperature shape memory alloys
Influence of Zr content on phase formation, transition and mechanical behavior of Ni-Ti-Hf-Zr high temperature shape memory alloys
复制标题
DOI：
10.1016/j.jallcom.2016.09.023
复制
发表时间：
2017-01-25
影响因子：
6.2
通讯作者：
Kim, Ki Buem
中科院分区：
文献类型：
--
作者：
Hong, Sung Hwan;Kim, Jeong Tae;Kim, Ki Buem
含不同Zr含量（0-15 at.%）的四元Ni-Ti-Hf-Zr高温形状记忆合金采用电弧熔炼和真空吸铸法制备。Zr的加入使B19'马氏体相的晶格常数和单斜角发生变化。随着Zr含量的增加，合金的相变温度和屈服强度逐渐升高。此外，合金的相变和变形行为也发生了显著的变化。当Zr的添加量达到7at.%时，合金表现出双屈服和两步相变行为。相比之下，含有10和15原子%的合金，Zr表现出单一屈服和一步相变行为。这些合金相变和屈服行为的差异主要与铸态合金马氏体相变时晶格畸变随Zr含量的增加而发生的马氏体相变中孪晶模式的结构演变有关。通过对Ni-Ti-Hf-Zr高温形状记忆合金的组织特征、热性能、力学性能及变形过程中的组织演变进行详细研究，阐明了Zr含量对Ni-Ti-Hf-Zr高温形状记忆合金的相形成、相变及变形行为的影响。(C)© 2016 Elsevier B. V.版权所有。
Quaternary Ni-Ti-Hf-Zr high temperature shape memory alloys containing different Zr content (0-15 at.%) were prepared by arc melting and suction casting. The addition of Zr led to change in lattice parameters and monoclinic angle of B19' martensite phase. The phase transformation temperature as well as yield strength of the alloys gradually increased with increasing the Zr content. Moreover, the alloys exhibited significant changes in phase transition and deformation behaviors. With the addition of Zr up to 7 at.%, the alloys exhibited double yielding and two-step phase transition behaviors. In contrast, alloys containing 10 and 15 at.% Zr revealed single yielding and one-step phase transition behaviors. These distinctions on phase transition and yielding behaviors of the alloys were mainly related to the structural evolution related to twinning mode in martensite phase of as-cast alloys originated from the change of lattice distortion during martensitic transformation by increasing of Zr content. Through detailed investigations on the microstructural features, thermal characteristics, mechanical properties and structural evolution on deformation of the alloys, the influence of Zr content on phase formation, phase transition and deformation behavior of Ni-Ti-Hf-Zr high temperature shape memory alloys was elucidated. (C) 2016 Elsevier B.V. All rights reserved.