Mg-Gd-Y-Zr镁合金高速激光熔覆Al-Si涂层的组织与性能

doi:10.13251/j.issn.0254-6051.2023.01.038

金属热处理 ›› 2023, Vol. 48 ›› Issue (1): 217-223.DOI: 10.13251/j.issn.0254-6051.2023.01.038

Mg-Gd-Y-Zr镁合金高速激光熔覆Al-Si涂层的组织与性能

杨胶溪¹, 黄凯¹, 武飞宇¹, 孙宏波², 阳代军², 李曙光², 葛学元^3,4, 王淼辉^3,4

1.北京工业大学材料与制造学部激光工程研究院, 北京 100124;
2.首都航天机械有限公司, 北京 100076;
3.北京机科国创轻量化科学研究院有限公司, 北京 100083;
4.中国机械科学研究总院先进成形技术与装备国家重点实验室, 北京 100083

收稿日期:2022-08-10 修回日期:2022-11-07 出版日期:2023-01-25 发布日期:2023-02-03
通讯作者: 黄凯,硕士研究生,E-mail:HuangKai@emails.bjut.edu.cn
作者简介:杨胶溪(1971—),男,副研究员,博士,主要研究方向为激光增材制造技术,E-mail:yangjiaoxi@bjut.edu.cn。
基金资助:
国家自然科学基金(52075011);先进成形技术与装备国家重点实验室开放基金(SKL202003)

Microstructure and properties of high speed laser clad Al-Si coating on Mg-Gd-Y-Zr magnesium alloy

Yang Jiaoxi¹, Huang Kai¹, Wu Feiyu¹, Sun Hongbo², Yang Daijun², Li Shuguang², Ge Xueyuan^3,4, Wang Miaohui^3,4

1. Institute of Laser Engineering, Faculty of Material and Manufacturing, Beijing University of Technology, Beijing 100124, China;
2. Capital Aerospace Machinery Co., Ltd., Beijing 100076, China;
3. Beijing National Innovation Institute of Lightweight Ltd., Beijing 100083, China;
4. State Key Laboratory for Advanced Forming Technology and Equipment, China Academy of Machinery and Technology, Beijing 100083, China

Received:2022-08-10 Revised:2022-11-07 Online:2023-01-25 Published:2023-02-03

摘要/Abstract

摘要： 采用高速激光熔覆技术在Mg-Gd-Y-Zr镁合金表面制备Al-Si涂层。通过光学显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)以及电化学分析测试、摩擦磨损测试对熔覆层的微观组织及性能进行表征,研究了基体与Al-Si涂层的冶金机理以及耐磨耐蚀能力。结果表明,熔覆层组织包括树枝状α-Mg固溶体、不规则块状Mg₂Si、α-Mg+Al₁₂Mg₁₇共晶以及花瓣状组织Al₃Mg₂。由于细晶强化和第二相强化等原因,Al-Si涂层的硬度达到160 HV0.1。此外,与镁合金基体相比,Al-Si涂层的耐腐蚀性能显著提高,自腐蚀电位相比基体提高约200 mV,自腐蚀电流密度降低2个数量级,抗磨损效果提高30.7%,因此Al-Si涂层有望成为稀土镁合金更有前景的耐磨耐蚀防护涂层。

关键词: 稀土镁合金, 激光熔覆, Al-Si涂层, 显微组织, 耐腐蚀性, 耐磨性能

Abstract: Microstructure and properties of Al-Si coating prepared on the surface of Mg-Gd-Y-Zr magnesium alloy by high-speed laser cladding process were characterized by means of optical microscope (OM), X-ray diffractometer (XRD), scanning electron microscope (SEM) and electrochemical test and wear test, and the metallurgical mechanism and wear and corrosion resistance of the substrate and Al-Si coating were analyzed. The results show than the microstructure of clad coating consists of dendritic α-Mg solid solution, irregular massive Mg₂Si, α-Mg+Mg₁₇Al₁₂ eutectic and petal-like Mg₂Al₃. Due to grain refinement strengthening and secondary phase strengthening, the hardness of the Al-Si coating reaches 160 HV0.1. In addition, compared with the magnesium alloy substrate, the corrosion resistance of the Al-Si coating is significantly improved, the self-corrosion potential is increased by about 200 mV, the self-corrosion current density is reduced by 2 orders of magnitude, and the anti-wear effect is increased by 30.7%, which indicate that the Al-Si coating is expected to become a more promising wear and corrosion resistant protective coatings for rare earth magnesium alloys.

Key words: rare earth magnesium alloy, laser cladding, Al-Si coating, microstructure, corrosion resistance, wear resistance

中图分类号:

TG174.4

杨胶溪, 黄凯, 武飞宇, 孙宏波, 阳代军, 李曙光, 葛学元, 王淼辉. Mg-Gd-Y-Zr镁合金高速激光熔覆Al-Si涂层的组织与性能[J]. 金属热处理, 2023, 48(1): 217-223.

Yang Jiaoxi, Huang Kai, Wu Feiyu, Sun Hongbo, Yang Daijun, Li Shuguang, Ge Xueyuan, Wang Miaohui. Microstructure and properties of high speed laser clad Al-Si coating on Mg-Gd-Y-Zr magnesium alloy[J]. Heat Treatment of Metals, 2023, 48(1): 217-223.

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Mg-Gd-Y-Zr镁合金高速激光熔覆Al-Si涂层的组织与性能

Microstructure and properties of high speed laser clad Al-Si coating on Mg-Gd-Y-Zr magnesium alloy

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