原位自生碳化物增强CoCrFeNi高熵合金的显微组织与力学性能

doi:10.11896/cldb.22050073

材料导报

2022, Vol. 36

Issue (14): 22050073-6 https://doi.org/10.11896/cldb.22050073

高熵合金*

原位自生碳化物增强CoCrFeNi高熵合金的显微组织与力学性能

陈瑞润^1,2, 陈秀刚¹, 高雪峰², 秦刚², 宋强¹, 崔洪芝¹

1 山东科技大学材料科学与工程学院,山东青岛 266500
2 哈尔滨工业大学材料科学与工程学院,哈尔滨 150001

Microstructure and Mechanical Properties of In-situ Carbides Reinforced CoCrFeNi High-entropy Alloys

CHEN Ruirun^1,2, CHEN Xiugang¹, GAO Xuefeng², QIN Gang², SONG Qiang¹, CUI Hongzhi¹

1 School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266500, Shandong, China
2 School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

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摘要为了提高面心立方(FCC)相高熵合金的强度,将Ti和C元素添加到FCC单相CoCrFeNi高熵合金中以实现强化效应。利用真空电弧熔炼法制备(CoCrFeNi)_100-x(TiC)_x (x=0、2、4、6、8(原子分数,%))高熵合金,研究了不同含量的Ti和C元素对CoCrFeNi合金显微组织和力学性能的影响。结果表明,添加Ti和C元素后,合金的微观结构由单一的FCC相转变为FCC基体相和原位自生富Ti碳化物,富Ti碳化物的形成并未改变基体相类型。富Ti碳化物沿着枝晶间凝固,呈片层状并相互连接形成网状组织。随着Ti和C含量的增加,FCC基体相含量逐渐降低,富Ti碳化物体积分数逐渐增大至12%。拉伸测试结果表明,随着富Ti碳化物含量的增加,合金的屈服强度和抗拉强度不断提高,延伸率呈下降趋势,当x=8时,抗拉强度从409 MPa(x=0)提升到618 MPa,同时合金能维持可应用的塑性,延伸率可达15.7%。硬度测试结果表明,随着富Ti碳化物含量的增加,合金的硬度呈上升趋势,当x=8时,硬度值为253HV_0.2。原位自生富Ti碳化物产生的第二相强化、固溶强化和枝晶间片层状、网状组织的协同效应使合金强度得到提升,同时合金还保持了较好的塑性。

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	陈瑞润
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关键词: 高熵合金碳化物微观组织力学性能固溶强化

Abstract: In order to strengthen FCC-type high-entropy alloy (HEA), Ti and C were added to FCC single-phase CoCrFeNi HEA to realize the strengthening effect. (CoCrFeNi)_100-x(TiC)_x(x=0, 2, 4, 6, 8(atomic fraction,%)) was prepared by vacuum arc melting. Effects of different contents of Ti and C on the microstructure and mechanical properties of CoCrFeNi HEA were studied. The results show that after adding Ti and C, the microstructure of (CoCrFeNi)_100-x(TiC)_x changes from single FCC phase to FCC matrix phase and in-situ Ti-rich carbides. The formation of Ti-rich carbides does not change the type of matrix phase. Ti-rich carbides solidify along the interdendrite, which is lamellar and connected with each other to form a network structure. With the increase of Ti and C content, the content of FCC matrix phase gradually decreases, and the vo-lume fraction of Ti-rich carbides gradually increases to 12%. The tensile test results show that with the increase of Ti-rich carbides content, the yield strength and tensile strength of the alloy increase continuously, while the elongation decreases; with x=8, the tensile strength can be increased from 409 MPa (x=0) to 618 MPa, with the applicable plasticity maintained, and the elongation can still reach 15.7%. The hardness test results show that the hardness of the alloy increases with the increase of Ti rich carbides content; with x=8, the hardness value is 253HV_{0 2}. The second phase strengthening of in-situ Ti-rich carbides, solid solution strengthening and the synergistic effect of dendritic lamellar and network structure improve the strength of the alloy and ensures its good plasticity.

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

发布日期: 2022-07-26

ZTFLH:

TG139

基金资助: 国家自然科学基金(51825401)

通讯作者: ruirunchen@hit.edu.cn; xiaoao7730@163.com

作者简介: 陈瑞润,哈尔滨工业大学材料加工工程专业教授、博士研究生导师,国家杰出青年基金获得者,万人计划科技创新领军人才,教育部新世纪优秀人才。1995—1999年,获山东工业大学(现山东大学)铸造学士学位。1999—2001年,获哈尔滨工业大学材料加工工程硕士学位。2001—2005年,获哈尔滨工业大学材料加工工程博士学位。2005—2007年,西北工业大学材料科学与工程博士后。2008—2009年,英国伯明翰学冶金与材料学院博士后。研究方向为电磁冷坩埚优化设计与制备(电磁效率优化以及坩埚内电磁场、温度场和流场的耦合与规律)、钛铝基合金定向凝固工艺与理论(电磁冷坩埚定向凝固、陶瓷坩埚定向、籽晶法定向)、钛铝基合金组织性能优化(合金化、超声细化、固态置氢、快速凝固、复合材料等)、铸造工艺与理论。
宋强,博士,副教授,硕士研究生导师。1999年毕业于山东工业大学焊接工艺与设备专业,获得学士学位;2002年毕业于兰州理工大学材料加工工程专业,获得工学硕士学位;2003年进入山东科技大学工作,期间就读于中国石油大学(华东)化工过程机械专业,并获得工学博士学位。主要从事金属材料表面改性、先进材料焊接等教学和科研工作。

引用本文:

陈瑞润, 陈秀刚, 高雪峰, 秦刚, 宋强, 崔洪芝. 原位自生碳化物增强CoCrFeNi高熵合金的显微组织与力学性能[J]. 材料导报, 2022, 36(14): 22050073-6.
CHEN Ruirun, CHEN Xiugang, GAO Xuefeng, QIN Gang, SONG Qiang, CUI Hongzhi. Microstructure and Mechanical Properties of In-situ Carbides Reinforced CoCrFeNi High-entropy Alloys. Materials Reports, 2022, 36(14): 22050073-6.

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http://www.mater-rep.com/CN/10.11896/cldb.22050073 或 http://www.mater-rep.com/CN/Y2022/V36/I14/22050073

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