等离子熔注AlCoCrFeNi(TiB2)x高熵合金涂层的硬度及热疲劳性能

doi:10.13251/j.issn.0254-6051.2026.01.045

金属热处理 ›› 2026, Vol. 51 ›› Issue (1): 297-301.DOI: 10.13251/j.issn.0254-6051.2026.01.045

等离子熔注AlCoCrFeNi(TiB₂)_x高熵合金涂层的硬度及热疲劳性能

黄志强, 王华君, 赵小雨, 潘伟, 白江鸿

武汉理工大学材料科学与工程学院, 湖北武汉 430070

收稿日期:2025-08-04 修回日期:2025-11-10 出版日期:2026-01-25 发布日期:2026-01-27
通讯作者: 王华君,副教授,博士,E-mail: wanghuajunhb@163.com
作者简介:黄志强(1999—),男,硕士研究生,主要研究方向为等离子喷焊与功能结构热锻模,E-mail: 3279437102@qq.com。
基金资助:
国家自然科学基金(51475346)

Hardness and thermal fatigue property of AlCoCrFeNi(TiB₂)_x high entropy alloy coating by plasma melting injection

Huang Zhiqiang, Wang Huajun, Zhao Xiaoyu, Pan Wei, Bai Jianghong

School of Materials Science and Engineering, Wuhan University of Technology, Wuhan Hubei 430070, China

Received:2025-08-04 Revised:2025-11-10 Online:2026-01-25 Published:2026-01-27

摘要/Abstract

摘要： 采用等离子熔注工艺在H13钢基体上制备了不同TiB₂添加量的AlCoCrFeNi(TiB₂)_x(x=5,10,15,20)高熵合金涂层,对其硬度和热疲劳性能进行了测试。结果表明,不同TiB₂添加量下,AlCoCrFeNi(TiB₂)_x高熵合金涂层硬度差异显著,x=5时涂层中生成硬质硼化物组织,硬度达到最大值750.04 HV0.1,x=10时硼化物消失,此后随x增大,涂层中BCC相含量增加,硬度呈逐步上升趋势。经1500次热循环后,各涂层抗热疲劳性能均优于H13钢基体:x=0时涂层预置裂纹尖端无明显裂纹,仅出现轻微氧化剥落,抗热疲劳性能最优;x=5时涂层熔合线附近因元素偏聚形成脆性组织,诱发主裂纹向基体延伸,抗热疲劳性能最差;x=10时涂层熔合线两端产生长裂纹,x=15时仅预置裂纹尖端出现少量交织微裂纹并伴随轻微氧化剥落,x=20时因TiB₂粉末结团导致涂层致密性下降。

关键词: 等离子熔注, 高熵合金涂层, 硬度, 热疲劳性能

Abstract: AlCoCrFeNi(TiB₂)_x (x =5, 10, 15, 20) high-entropy alloy coatings with different TiB₂ addition amounts were prepared on H13 steel substrate by plasma melt injection (PMI) process, and the hardness and thermal fatigue properties of the coatings were investigated. The results show that the hardness of the AlCoCrFeNi(TiB₂)_x high-entropy alloy coatings exhibits significant difference under different TiB₂additions. When x=5, the hardness achieves the maximum value (750.04 HV0.1) due to the formation of hard boride structures. When x=10, the borides disappears. Subsequently, as x increases, the BCC phase content in the coating increases, and the hardness shows a gradual upward trend. After 1500 thermal cycles, all the coatings demonstrate superior thermal fatigue resistance compared to the H13 substrate. When x=0, no significant cracks are observed at the prefabricated crack tip of coating, with only minor oxidation spalling, indicating the best thermal fatigue resistance. When x=5, brittle structures form near the fusion line due to element segregation, inducing primary cracks to propagate into the substrate, resulting in the worst thermal fatigue resistance. When x=10, long cracks develop at both ends of the fusion line. When x=15, only a few interlaced microcracks appear at the prefabricated crack tip, accompanied by slight oxidation spalling. When x=20, the TiB₂ powder agglomeration reduces the coating compactness.

Key words: plasma melt injection, high entropy alloy coating, hardness, thermal fatigue property

中图分类号:

TG404

黄志强, 王华君, 赵小雨, 潘伟, 白江鸿. 等离子熔注AlCoCrFeNi(TiB₂)_x高熵合金涂层的硬度及热疲劳性能[J]. 金属热处理, 2026, 51(1): 297-301.

Huang Zhiqiang, Wang Huajun, Zhao Xiaoyu, Pan Wei, Bai Jianghong. Hardness and thermal fatigue property of AlCoCrFeNi(TiB₂)_x high entropy alloy coating by plasma melting injection[J]. Heat Treatment of Metals, 2026, 51(1): 297-301.

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等离子熔注AlCoCrFeNi(TiB₂)_x高熵合金涂层的硬度及热疲劳性能

Hardness and thermal fatigue property of AlCoCrFeNi(TiB₂)_x high entropy alloy coating by plasma melting injection

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