C对CoFe2NiV0.5Mo0.2高熵合金结构和力学性能的影响

doi:10.11896/cldb.21010131

材料导报

2021, Vol. 35

Issue (17): 17026-17030 https://doi.org/10.11896/cldb.21010131

高熵合金

C对CoFe₂NiV_0.5Mo_0.2高熵合金结构和力学性能的影响

张国家¹, 李忍¹, 刘德华², 卢一平¹, 王同敏¹, 李廷举¹

1 大连理工大学材料科学与工程学院,辽宁省凝固控制与数字化制备技术重点实验室,大连 116024
2 大连理工大学,辽宁省高熵合金材料工程研究中心,大连 116024

Effect of C on Microstructure and Mechanical Properties of CoFe₂NiV_0.5Mo_0.2 High Entropy Alloy

ZHANG Guojia¹, LI Ren¹, LIU Dehua², LU Yiping¹, WANG Tongmin¹, LI Tingju¹

1 Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
2 Material Engineering Research Center of High Entropy Alloy (Liaoning Province), Dalian 116024, China

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摘要研究添加0%～10%(原子分数,下同) C对CoFe₂NiV_0.5Mo_0.2高熵合金显微组织、相结构和室温力学性能的影响。研究结果表明,随着C含量的增加,合金的微观组织由单一面心立方结构(FCC)转变为FCC基体+V₈C₇碳化物纤维的共晶组织,再转变为FCC基体+粗大V₈C₇+针状MoC组织,在转变过程中合金的压缩屈服强度明显提升,并保持较高的塑性。其中添加6%C时,合金的屈服强度和硬度可达到900 MPa、270HV。研究结果显示,以C为代表的小原子半径元素可以作为间隙固溶元素或与金属元素相结合形成碳化物第二相来提高FCC结构高熵合金的强度,改善合金的综合力学性能。

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	张国家
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	李廷举

关键词: 高熵合金间隙固溶强化碳化物强化微观组织力学性能

Abstract: Effects of the addition of C with different molar fraction (0%—10%) on microstructure, phase structure and mechanical properties at room temperature of the CoFe₂NiV_0.5Mo_0.2 high entropy alloy were investigated. The results show that with the increase of C content, the microstructure of alloy changed from a single face centered cubic structure (FCC) to eutectic structure (FCC matrix+V₈C₇ carbide fiber) and then to (FCC matrix+coarse V₈C₇+acicular MoC). The compressive yield strength of the alloy was improved significantly and remained good ductility simultaneously. When C content is 6%, the yield strength and hardness of the alloy can reach 900 MPa and 270HV respectively. The research results show that elements with small atomic radius represented by C can solubilize as interstitial element or combined with metal element to form carbide second phase, which can improve the FCC-structured high entropy alloy strength, thus optimizing its comprehensive mechanical properties.

Key words: high entropy alloy interstice solution strengthening carbide strengthening microstructure mechanical property

发布日期: 2021-09-26

ZTFLH:

TG132.3

基金资助: 国家重点研发计划项目(2019YFA0209901; 2018YFA0702901);国家自然科学基金(51822402; U20A20278);辽宁省“兴辽英才计划”项目(XLYC1807047);西北工业大学凝固技术国家重点实验室资助项目(SKLSP201902)

通讯作者: luyiping@dlut.edu.cn

作者简介: 张国家,2019年6月毕业于沈阳工业大学,获得硕士学位,目前在卢一平教授指导下攻读大连理工大学博士学位,主要从事高熵合金的成分设计、变形机制以及强韧化研究。
卢一平,大连理工大学材料科学与工程学院副院长,入选国家高端人才计划(2020)、科技部中青年科技创新领军人才(2020)、国家优青(2018)、首届“兴辽英才计划”辽宁省青年拔尖人才(2018)、大连市杰出青年基金获得者(2019)、大连市青年科技之星(2016)、中国材料研究学会凝固科学与技术分会理事/副秘书长、空间材料科学与技术分会理事,中国材料研究学会青年工作委员会常务理事,Acta Metallurgica Sinica (英文)期刊、《材料导报》《中国材料进展》《特种铸造及有色合金》期刊编委等。近5年谷歌学术总引用近3 000次,H指数28,高被引文章3篇,授权发明专利8项。获2018年度辽宁省自然成果学术成果奖(论文)一等奖、中国物理学会同步辐射分会“青年之光”论文奖;2019武汉中国材料学会“新材料国际趋势会”青年科学家论坛“优秀青年科学家奖”;2019中国材料大会 “非晶与高熵合金”分会“Outstanding Young Scientist”奖;获2015年度教育部技术发明一等奖(排4)、国家技术发明二等奖(排4)。目前主要从事高熵合金的成分设计理论以及工业化制备技术研究。

引用本文:

张国家, 李忍, 刘德华, 卢一平, 王同敏, 李廷举. C对CoFe₂NiV_0.5Mo_0.2高熵合金结构和力学性能的影响[J]. 材料导报, 2021, 35(17): 17026-17030.
ZHANG Guojia, LI Ren, LIU Dehua, LU Yiping, WANG Tongmin, LI Tingju. Effect of C on Microstructure and Mechanical Properties of CoFe₂NiV_0.5Mo_0.2 High Entropy Alloy. Materials Reports, 2021, 35(17): 17026-17030.

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http://www.mater-rep.com/CN/10.11896/cldb.21010131 或 http://www.mater-rep.com/CN/Y2021/V35/I17/17026

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