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V含量对等原子比NiTi形状记忆合金微观组织、相变行为和显微硬度的影响
作者:
作者单位:

1.广东省科学院新材料研究所，广东 广州 510650;2.安徽工业大学 冶金工程学院，安徽 马鞍山 243002;3.广东省金属强韧化技术与应用重点实验室，广东 广州 510650

基金项目:

Guangdong province science and technology plan project (Grant No. 2019B090905009); Guangzhou science and technology plan project (Grant No. 201704030067)


Effect of V Content on Microstructure, Phase Transforma-tion Behavior and Microhardness of Equiatomic NiTi Shape Memory Alloy
Author:
Affiliation:

1.Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China;2.College of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, China;3.Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Guangzhou 510650, China

Fund Project:

Guangdong Province Science and Technology Plan Project (2019B090905009); Guangzhou Science and Technology Plan Project (201704030067)

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    摘要:

    采用光学显微镜、扫描电子显微镜、X射线衍射仪、差示扫描量热仪和显微硬度计等测试手段，研究了V含量对等原子比NiTi形状记忆合金微观组织、相变行为和显微硬度的影响规律。结果表明：当V含量为0.5at%时，具有等轴晶组织的NiTiV形状记忆合金包含B19' 和 Ti2Ni相；当V 含量大于0.5at%时，NiTiV形状记忆合金形成B19'相、Ti2Ni相和V的富集相，并且随着V含量增加，V的富集相越来越多聚集于晶界。进一步分析表明，Ni49.75Ti49.75V0.5和Ni49.25Ti49.25V1.5 形状记忆合金发生了B2?B19'的一级相变，而Ni48.75Ti48.75V2.5和Ni48.25Ti48.25V3.5形状记忆合金发生了B2?R?B19'的二级相变，尽管降温过程中同时发生了部分的R相变与B19'马氏体相变。随着V含量增加，相变温度随着V含量增加逐渐降低，其主要原因是Ni/Ti比例的增加。此外，随着V含量增加，合金的显微硬度值呈现先降低然后几乎保持不变的变化规律。

    Abstract:

    The effect of vanadium (V) content on the microstructure, phase transformation behavior, and microhardness of the as-cast equiatomic NiTi shape memory alloy was investigated by optical microscope (OM), scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and Vickers microhardness tester. Results indicate that the as-cast Ni50-x/2Ti50-x/2Vx alloys with equiaxed grains consist mainly of B19' and Ti2Ni phases when V content is 0.5at%, above which Ni50-x/2Ti50-x/2Vx (x=1.5~3.5, at%) alloys exhibit a three-phase structure consisting of B19', Ti2Ni and V-rich phases, and the V-rich phases are more segregated at grain boundaries with the increase of V content. Further analysis reveals that both Ni49.75Ti49.75V0.5 and Ni49.25Ti49.25V1.5 alloys show a one-stage B2?B19' transformation. However, a two-stage B2?R?B19' transformation occurs in Ni48.75Ti48.75V2.5 and Ni48.25Ti48.25V3.5 alloys although R-phase transformation partially overlaps B19' martensitic transformation upon cooling. The transformation temperatures drop down with increasing the V content, which is attributed to the increase of Ni/Ti ratio in the matrix. In addition, as V element increases from 0.5at% to 3.5at%, the microhardness of the alloys first decreases and then remains almost unchanged.

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甘春雷,陈志伟,黎小辉,周楠,钱健清,郑开宏,李继林.V含量对等原子比NiTi形状记忆合金微观组织、相变行为和显微硬度的影响[J].稀有金属材料与工程,2021,50(12):4245~4250.[Gan Chunlei, Chen Zhiwei, Li Xiaohui, Zhou Nan, Qian Jianqing, Zheng Kaihong, Li Jilin. Effect of V Content on Microstructure, Phase Transforma-tion Behavior and Microhardness of Equiatomic NiTi Shape Memory Alloy[J]. Rare Metal Materials and Engineering,2021,50(12):4245~4250.]
DOI：10.12442/j. issn.1002-185X. E20210015

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  • 收稿日期:2021-05-19
  • 最后修改日期:2021-06-22
  • 录用日期:2021-07-09
  • 在线发布日期: 2021-12-30
  • 出版日期: 2021-12-24

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