Al含量对粉末冶金CoCrFeMnNi高熵合金组织结构与性能的影响

doi:10.3901/JME.2024.20.134

机械工程学报 ›› 2024, Vol. 60 ›› Issue (20): 134-143.doi: 10.3901/JME.2024.20.134

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Al含量对粉末冶金CoCrFeMnNi高熵合金组织结构与性能的影响

冒爱琴^1,2, 陈诗洁², 贾洋刚², 邵霞², 权峰², 张晖^1,2, 张义伟², 金莹³, 金霞³

1. 安徽工业大学先进金属材料绿色制备与表面技术教育部重点实验室马鞍山 243000;
2. 安徽工业大学材料科学与工程学院马鞍山 243032;
3. 浙江省钎焊材料与技术重点实验室杭州 310030

收稿日期:2023-10-11 修回日期:2024-05-12 出版日期:2024-10-20 发布日期:2024-11-30
通讯作者: 张义伟,男,1981年出生,博士,副教授。主要研究方向为功能金属材料制备及应用。E-mail:zhyw126@ahut.edu.cn
作者简介:冒爱琴,女,1978年出生,博士,副教授。主要研究方向为功能高熵材料制备及应用。E-mail:maoaiqinmaq@163.com
基金资助:
国家自然科学基金(51971001);安徽省自然科学基金(2008085ME125);先进金属材料绿色制备与表面技术教育部重点实验室主任基金(GFST2022ZR08)和浙江省公益技术研究计划(LGG20E010002)资助项目。

Effect of Aluminum Content on Microstructure and Properties of Powder Metallurgy CoCrFeMnNi High-entropy Alloy

MAO Aiqin^1,2, CHEN Shijie², JIA Yanggang², SHAO Xia², QUAN Feng², ZHANG Hui^1,2, ZHANG Yiwei², JIN Ying³, JIN Xia³

1. Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Ma'anshan 243000;
2. School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan 243032;
3. Zhejiang Province Key Laboratory of Soldering &Brazing Materials and Technology, Hangzhou 310030

Received:2023-10-11 Revised:2024-05-12 Online:2024-10-20 Published:2024-11-30

摘要/Abstract

摘要： CoCrFeMnNi高熵合金具有优异的延展性和断裂韧性，但是其较低的强度和硬度使其在结构材料领域的应用潜力受到很大限制。目前关于Al粉添加对粉末冶金CoCrFeMnNi组织结构和性能的报道较少。以CoCrFeMnNi高熵合金粉体和Al粉为原料，采用真空热压烧结法制备了不同Al含量的CoCrFeMnNi高熵合金，借助于X射线衍射、扫描电子显微镜/能量散射光谱、纳米压痕、显微硬度、室温压缩性能和极化曲线等测试方法，研究了Al含量对CoCrFeMnNi高熵合金组织结构和性能的影响。结果表明：随着Al含量从0增加到5 wt.%，高熵合金致密度提高，在FCC基体中析出的网状富Cr的BCC相体积分数增大。当Al含量增加至5 wt.%，高熵合金FCC相的纳米压痕硬度和弹性模量略有增加且BCC相明显高于FCC相，维氏硬度由248.4 HV增加到508.3 HV，室温压缩强度也大幅度提高，而析出强化效应是硬度和强度提高的主要原因；同时高熵合金具有最小腐蚀电流密度，耐腐蚀性明显提高。但是，过量Al含量使得Al元素产生偏析、BCC结构体积分数和微观组织结构不均匀性急剧增大，导致材料硬度、弹性模量以及耐腐蚀性能降低。

关键词: CoCrFeMnNi高熵合金, 粉末冶金, Al含量, 微观组织, 纳米/维氏硬度, 耐腐蚀性

Abstract: CoCrFeNiMn high-entropy alloy (HEA) generally exhibits outstanding ductility and fracture toughness properties, however its low strength and hardness limit its application potential in the field of structural materials. There are few reports on the effect of Al content on microstructure and properties of CoCrFeMnNi HEA fabricated by powder metallurgy at present. CoCrFeMnNi HEAs with different Al content were prepared by hot-pressing sintering method using gas-atomized HEA powder and Al powder as raw materials. The effect of Al content on microstructure and properties of HEAs was investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM)/energy dispersive spectroscopy (EDS), nanoindentation experiment, vickers hardness, compression at room temperature and polarization curves. The results show that with the increase of Al content from 0 to 5 wt.%, the relative density and the volume fraction of reticular Cr-rich BCC phase precipitated in the FCC matrix of as-prepared HEAs increase. When the Al content increases to 5 wt.%, the nano-indentation hardness and elastic modulus of the FCC phase in fabricated HEA increase slightly and the mentioned performance of BCC phase is significantly higher than that of FCC phase, the vickers hardness increases from 248.4 to 508.3 HV and the compression strength at room temperature is also greatly improved mainly due to the precipitation strengthening effect; At the same time, the minimum corrosion current density is obtained, confirming the improved corrosion resistance. However, the addition of excessive Al leads to the segregation of Al element, and a sharp increase in the volume fraction of BCC structure and microstructural heterogeneity of as-fabricated HEA, which deteriorates the hardness, elastic modulus and corrosion resistance.

Key words: CoCrFeMnNi high-entropy alloy, powder metallurgy, Al content, microstructure, nanoindentation/vickers hardness, corrosion resistance

中图分类号:

TG132

冒爱琴, 陈诗洁, 贾洋刚, 邵霞, 权峰, 张晖, 张义伟, 金莹, 金霞. Al含量对粉末冶金CoCrFeMnNi高熵合金组织结构与性能的影响[J]. 机械工程学报, 2024, 60(20): 134-143.

MAO Aiqin, CHEN Shijie, JIA Yanggang, SHAO Xia, QUAN Feng, ZHANG Hui, ZHANG Yiwei, JIN Ying, JIN Xia. Effect of Aluminum Content on Microstructure and Properties of Powder Metallurgy CoCrFeMnNi High-entropy Alloy[J]. Journal of Mechanical Engineering, 2024, 60(20): 134-143.

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Al含量对粉末冶金CoCrFeMnNi高熵合金组织结构与性能的影响

Effect of Aluminum Content on Microstructure and Properties of Powder Metallurgy CoCrFeMnNi High-entropy Alloy

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