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材料导报  2022, Vol. 36 Issue (14): 22030309-5    https://doi.org/10.11896/cldb.22030309
  高熵合金* |
谐波异质结构AlCoCrFeNi高熵合金的制备、组织演化与力学性能
修明清1,2, 李天昕1, 张国家1, 邹龙江3, 卢一平1,2
1 大连理工大学材料科学与工程学院,辽宁 大连 116024
2 辽宁省高熵合金材料工程研究中心,辽宁 大连 116024
3 大连理工大学材料科学与工程学院,材料测试分析中心,辽宁 大连 116024
Preparation, Microstructure Evolution and Mechanical Properties of AlCoCrFeNi High-entropy Alloys with Harmonic Heterostructure
XIU Mingqing1,2, LI Tianxin1, ZHANG Guojia1, ZOU Longjiang3, LU Yiping1,2
1 School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
2 High Entropy Alloys Materials Engineering Research Center (Liaoning Province), Dalian 116024, Liaoning, China
3 Material Test and Analysis Center, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
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摘要 结合机械球磨与放电等离子烧结工艺制备了一种由外层细小晶粒与内层粗大晶粒构成的谐波异质结构AlCoCrFeNi高熵合金(High-entropy alloys, HEAs),测试了其准静态压缩力学性能,并对该合金的相结构与微观组织进行了表征。结果表明,球磨后烧结的AlCoCrFeNi高熵合金的屈服强度为1 686 MPa,压缩应变率为16.5%;未球磨直接进行烧结的AlCoCrFeNi高熵合金的屈服强度仅为1 371 MPa,压缩应变率为16.2%;铸态AlCoCrFeNi高熵合金的屈服强度为1 363 MPa,压缩应变率为18.7%。与其他两种制备方法相比,球磨和烧结工艺制备的AlCoCrFeNi高熵合金的综合力学性能最佳。烧结制备的AlCoCrFeNi高熵合金在相组成上与原始粉末一致,未发生变化,均由BCC+B2+FCC相构成;机械球磨细化了AlCoCrFeNi高熵合金粉末外层的晶粒,外层小晶粒与内层大晶粒形成谐波异质结构,这种特殊的结构在变形时起到背应力强化作用,显著提高了AlCoCrFeNi高熵合金的屈服强度。
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修明清
李天昕
张国家
邹龙江
卢一平
关键词:  高熵合金  谐波异质结构  力学性能  背应力强化    
Abstract: Akind of AlCoCrFeNi high-entropy alloy (HEA) with harmonic heterostructure composed of outer fine grains and inner coarse grains was prepared by mechanical ball milling and spark plasma sintering. The quasi-static compressive mechanical properties of the alloy were tes-ted, and the phase structure and microstructure of the alloy were characterized. The results show that the yield strength of sintered AlCoCrFeNi HEA after ball milling is 1 686 MPa and the compressive strain rate is 16.5%. The yield strength and the compressive strain rate of the sintered AlCoCrFeNi HEA without ball milling are only 1 371 MPa and 16.2%, respectively. The yield strength and the compressive strain rate of the as-cast AlCoCrFeNi HEA are 1 363 MPa and 18.7%, respectively. Compared with the other two methods, the AlCoCrFeNi HEA prepared by ball milling and sintering has the best comprehensive mechanical property. The phase composition of the AlCoCrFeNi HEA prepared by sintering is consistent with that of the original powder, both composed of BCC+B2+FCC phase. The outer grains of the AlCoCrFeNi HEA powder were refined by mechanical ball milling, and formed harmonic heterostructure with the inner large grains. This special structure plays a role of back stress strengthening, and significantly improves the yield strength of the AlCoCrFeNi HEA.
Key words:  high-entropy alloy    harmonic heterostructure    mechanical property    back stress strengthening
发布日期:  2022-07-26
ZTFLH:  TG135.1  
基金资助: 国家重点研发计划项目(2019YFA0209901;2018YFA0702901);辽宁省“兴辽英才计划”项目(XLYC1807047);宁波市“科技创新2025”重大专项(2019B10086)
通讯作者:  zoulong@dlut.edu.cn   
作者简介:  修明清,2019年6月毕业于山东理工大学,获得工学学士学位,现为大连理工大学在读硕士研究生,在卢一平教授和邹龙江教授的指导下进行研究。目前主要研究领域为高熵合金的成分和结构设计以及强韧化研究。
邹龙江,教授级高级工程师,大连理工大学材料测试分析中心主任、硕士研究生导师,1987年大连理工大学铸造专业本科毕业,2002年大连理工大学内燃机专业硕士毕业留校工作至今,发表文章60余篇,主要从事金属与非金属材料微纳结构形态研究、材料微纳结构研究与性能分析、工程材料的断裂机理研究与工程失效分析、功能复合材料制备与性能分析。
引用本文:    
修明清, 李天昕, 张国家, 邹龙江, 卢一平. 谐波异质结构AlCoCrFeNi高熵合金的制备、组织演化与力学性能[J]. 材料导报, 2022, 36(14): 22030309-5.
XIU Mingqing, LI Tianxin, ZHANG Guojia, ZOU Longjiang, LU Yiping. Preparation, Microstructure Evolution and Mechanical Properties of AlCoCrFeNi High-entropy Alloys with Harmonic Heterostructure. Materials Reports, 2022, 36(14): 22030309-5.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.22030309  或          http://www.mater-rep.com/CN/Y2022/V36/I14/22030309
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