Al0.3CoCrFeNi高熵合金与YG15硬质合金钎焊接头组织及力学性能研究

doi:10.3901/JME.2024.22.086

机械工程学报 ›› 2024, Vol. 60 ›› Issue (22): 86-93.doi: 10.3901/JME.2024.22.086

• 特邀专栏：异种材料焊接与连接 • 上一篇下一篇

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Al_0.3CoCrFeNi高熵合金与YG15硬质合金钎焊接头组织及力学性能研究

王鹏程^1,2, 李锦政^1,2, 刘维瀚^1,2, 陈海燕^1,2, 李文亚^1,2

1. 西北工业大学材料学院西安 710072;
2. 西北工业大学凝固技术国家重点实验室西安 710072

收稿日期:2024-05-06 修回日期:2024-09-09 出版日期:2024-11-20 发布日期:2025-01-02
作者简介:王鹏程,男,1996年出生,博士。主要研究方向为异种材料钎焊。E-mail:wangpc@nwpu.edu.cn;陈海燕(通信作者),男,1984年出生,博士,教授,博士研究生导师。主要研究方向为精密钎焊连接技术。
基金资助:
国家重点研发计划(2022YFB3402200)、国家自然科学基金(52374402)、中国博士后科学基金(2023TQ0271，2023M742831)、国家科技重大专项(J2022-VII-0003-0045)、宁波市首批重大科技攻关(2022Z109)和广东省基础与应用基础研究基金(2023A1515111150)资助项目。

Research on Microstructure and Mechanical Properties of Brazed Joint of Al_0.3CoCrFeNi High Entropy Alloy and YG15 Hard Alloy

WANG Pengcheng^1,2, LI Jinzheng^1,2, LIU Weihan^1,2, CHEN Haiyan^1,2, LI Wenya^1,2

1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072;
2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072

Received:2024-05-06 Revised:2024-09-09 Online:2024-11-20 Published:2025-01-02
About author:10.3901/JME.2024.22.086

摘要/Abstract

摘要： Al_xCoCrFeNi系高熵合金具有优异的韧性和耐腐蚀性，是深空探测、地质钻探等苛刻服役工况下的理想材料。但其硬度低、摩擦磨损性能差的缺点限制了进一步应用。硬质合金的突出特点是具有超高硬度和良好耐磨性。为使Al_xCoCrFeNi系高熵合金适应摩擦磨损等恶劣服役环境，获得兼具高韧性与高硬度的复合构件。本研究采用BNi2钎料钎焊连接YG15硬质合金与Al_0.3CoCrFeNi高熵合金，阐明了钎焊温度对YG15/Al_0.3CoCrFeNi钎焊接头的微观组织形貌及其力学性能影响。结果表明：焊缝中心组织以Ni(s,s)为主，高熵合金侧扩散区由BNi2与基体在钎焊过程中互扩散形成，硬质合金侧形成了W(s,s)相。典型接头微观组织结构为YG15/W(s,s)/Ni(s,s)+Cr_0.8Ni_0.2/HEA+Cr₅B₃/Al_0.3CoCrFeNi。当保温时间一定时，随着钎焊温度的升高，接头的剪切强度先增大后减小，接头的失效发生在焊缝靠近硬质合金母材处。在1 080 ℃/10 min的工艺参数下，接头的剪切强度最高可以达到354 MPa。研究实现了高熵合金与硬质合金的钎焊连接，获得了YG15/Al_0.3CoCrFeNi复合构件，为极端复杂服役环境下的高熵合金/硬质合金复合构件的制备提供了新的视野。

关键词: 钎焊, 硬质合金, 高熵合金, 界面组织, 力学性能

Abstract: The Al_xCoCrFeNi high-entropy alloy exhibits excellent toughness and corrosion resistance, making it an ideal material for demanding service conditions such as deep space exploration and geological drilling. However, the shortcomings of low hardness and poor friction and wear performance limit further applications. The outstanding features of cemented carbide are its ultra-high hardness and good wear resistance. To address the limitations of Al_xCoCrFeNi alloys and create components that combine high toughness with high hardness, this study employed BNi2 brazing material to join YG15 cemented carbide with Al_0.3CoCrFeNi high-entropy alloy. The investigation focused on the influence of brazing temperature on the microstructure and mechanical properties of the YG15/Al_0.3CoCrFeNi brazed joint. The results revealed the following microstructural features：The central region of the brazed joint is dominated by Ni(s,s). On the high-entropy alloy side, a diffusion zone formed due to mutual diffusion between BNi2 and the matrix during brazing. Furthermore, the W(s,s) are observed in the YG15 interface side. The typical microstructure of the joint is as follows：YG15/W(s,s) /Ni(s,s)+Cr_0.8Ni_0.2 / HEA+Cr₅B₃ / Al_0.3CoCrFeNi. Interestingly, as the brazing temperature increased, the shear strength of the joint initially increased and then decreased. Ultimately, joint failure occurred near the cemented carbide parent material within the brazed seam. Under the process parameters of 1 080 ℃ for 10 minutes, the joint achieved a maximum shear strength of 354 MPa. This study successfully achieved brazing connections between high-entropy alloys and cemented carbides, resulting in the YG15/Al_0.3CoCrFeNi composite component. These findings offer new perspectives for preparing composite components of high-entropy alloys and cemented carbides in extreme service environments.

Key words: brazing, hard alloy, high entropy alloy, interfacial microstructure, mechanical property

中图分类号:

TG454

王鹏程, 李锦政, 刘维瀚, 陈海燕, 李文亚. Al_0.3CoCrFeNi高熵合金与YG15硬质合金钎焊接头组织及力学性能研究[J]. 机械工程学报, 2024, 60(22): 86-93.

WANG Pengcheng, LI Jinzheng, LIU Weihan, CHEN Haiyan, LI Wenya. Research on Microstructure and Mechanical Properties of Brazed Joint of Al_0.3CoCrFeNi High Entropy Alloy and YG15 Hard Alloy[J]. Journal of Mechanical Engineering, 2024, 60(22): 86-93.

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Research on Microstructure and Mechanical Properties of Brazed Joint of Al_0.3CoCrFeNi High Entropy Alloy and YG15 Hard Alloy

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Al0.3CoCrFeNi高熵合金与YG15硬质合金钎焊接头组织及力学性能研究

Research on Microstructure and Mechanical Properties of Brazed Joint of Al0.3CoCrFeNi High Entropy Alloy and YG15 Hard Alloy

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Al_0.3CoCrFeNi高熵合金与YG15硬质合金钎焊接头组织及力学性能研究

Research on Microstructure and Mechanical Properties of Brazed Joint of Al_0.3CoCrFeNi High Entropy Alloy and YG15 Hard Alloy