Cr含量对CrxMoNbTiZr系高熵合金组织与性能的影响

doi:10.13251/j.issn.0254-6051.2023.01.004

金属热处理 ›› 2023, Vol. 48 ›› Issue (1): 18-22.DOI: 10.13251/j.issn.0254-6051.2023.01.004

Cr含量对Cr_xMoNbTiZr系高熵合金组织与性能的影响

郭景平¹, 肖逸锋^1,2,3, 吴靓¹, 张乾坤¹, 刘梓屹¹, 何鹏聪¹

1.湘潭大学机械工程与力学学院, 湖南湘潭 411105;
2.焊接机器人及应用技术湖南省重点实验室, 湖南湘潭 411105;
3.复杂轨迹加工工艺及装备教育部工程研究中心, 湖南湘潭 411105

收稿日期:2022-08-12 修回日期:2022-10-14 出版日期:2023-01-25 发布日期:2023-02-03
通讯作者: 肖逸锋,教授,博士,E-mail:xiaoyifeng@xtu.edu.cn
作者简介:郭景平(1997—),男,硕士研究生,主要研究方向为高熵合金制备与性能,E-mail:91234499@qq.com。
基金资助:
湖南省自然科学基金(2018JJ2395)

Effect of Cr content on microstructure and properties of Cr_xMoNbTiZr high-entropy alloys

Guo Jingping¹, Xiao Yifeng^1,2,3, Wu Liang¹, Zhang Qiankun¹, Liu Ziyi¹, He Pengcong¹

1. School of Mechanical Engineering and Mechanics, Xiangtan University, Xiangtan Hunan 411105, China;
2. Welding Robot and Application Technology Hunan Provincial Key Laboratory, Xiangtan Hunan 411105, China;
3. Engineering Research Center of Complex Trajectory Processing Technology and Equipment of Ministry of Education, Xiangtan Hunan 411105, China

Received:2022-08-12 Revised:2022-10-14 Online:2023-01-25 Published:2023-02-03

摘要/Abstract

摘要： 采用真空电弧熔炼的方法制备了Cr_xMoNbTiZr系高熵合金(x=0, 0.5, 1, 1.5)。利用X射线衍射仪(XRD)、扫描电镜(SEM)、能谱仪(EDS)、显微硬度计以及电化学工作站研究了Cr含量对该高熵合金结构、组织、硬度和耐蚀性能的影响。结果表明,Cr的添加使合金由单相BCC结构转变为富Zr相与富Mo-Nb相的双相BCC结构,随着Cr含量增加,在富Zr相中还有富Cr的Laves相析出;Cr_1.5MoNbTiZr合金具有最高硬度765.53 HV,这是由于第二相析出强化、固溶强化与高熵合金晶格畸变的共同作用;Cr的加入增加了Cr_xMoNbTiZr系高熵合金在质量分数为3.5%NaCl溶液中发生腐蚀倾向,但降低了该系高熵合金的腐蚀速率,同时发现Cr的添加存在一个临界值来保证合金的抗点蚀能力,超过这个临界值合金就会更容易发生点蚀现象。

关键词: 高熵合金, 真空电弧熔炼, 组织结构, 耐蚀性能

Abstract: Cr_xMoNbTiZr high-entropy alloys (x=0, 0.5, 1, 1.5) were prepared by vacuum arc melting. X-ray diffractometer (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), microhardness tester and electrochemical workstation were used to study the effect of Cr content on the crystallographic structure, microstructure, hardness and corrosion resistance of the high-entropy alloy. The results show that the addition of Cr makes the alloy change from a single-phase BCC structure to a dual-phase BCC structure of Zr-rich phase and Mo-Nb-rich phase. With the increase of Cr content, there is also a Cr-rich Laves phase precipitate in the Zr-rich phase. The Cr_1.5MoNbTiZr alloy has the highest hardness of 765.53 HV, which is due to the combined effect of the second phase precipitation strengthening, solution strengthening and high-entropy alloy lattice distortion. The addition of Cr increases the corrosion tendency of the Cr_xMoNbTiZr high entropy alloy in 3.5%NaCl solution (mass fraction), but reduces the corrosion rate of this high entropy alloy. Meanwhile, it is found that the addition of Cr has a critical value to ensure the pitting resistance of the alloy, beyond which the alloy is more prone to pitting.

Key words: high entropy alloy, vacuum arc melting, microstructure, corrosion resistance

中图分类号:

TG146

郭景平, 肖逸锋, 吴靓, 张乾坤, 刘梓屹, 何鹏聪. Cr含量对Cr_xMoNbTiZr系高熵合金组织与性能的影响[J]. 金属热处理, 2023, 48(1): 18-22.

Guo Jingping, Xiao Yifeng, Wu Liang, Zhang Qiankun, Liu Ziyi, He Pengcong. Effect of Cr content on microstructure and properties of Cr_xMoNbTiZr high-entropy alloys[J]. Heat Treatment of Metals, 2023, 48(1): 18-22.

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Cr含量对Cr_xMoNbTiZr系高熵合金组织与性能的影响

Effect of Cr content on microstructure and properties of Cr_xMoNbTiZr high-entropy alloys

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Cr含量对CrxMoNbTiZr系高熵合金组织与性能的影响

Effect of Cr content on microstructure and properties of CrxMoNbTiZr high-entropy alloys

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Cr含量对Cr_xMoNbTiZr系高熵合金组织与性能的影响

Effect of Cr content on microstructure and properties of Cr_xMoNbTiZr high-entropy alloys