固溶处理对Mg-6Gd-3Y-1.5Zn-0.6Zr稀土镁合金组织的影响

doi:10.13251/j.issn.0254-6051.2025.07.011

金属热处理 ›› 2025, Vol. 50 ›› Issue (7): 73-80.DOI: 10.13251/j.issn.0254-6051.2025.07.011

固溶处理对Mg-6Gd-3Y-1.5Zn-0.6Zr稀土镁合金组织的影响

甘婵¹, 陈懿², 张义飞³, 臧千昊¹, 陈洪美¹

1.江苏科技大学材料科学与工程学院, 江苏镇江 212003;
2.中国机械总院集团北京机电研究所有限公司, 北京 100083;
3.中冶焦耐(大连)工程技术有限公司, 辽宁大连 116085

收稿日期:2025-02-10 修回日期:2025-05-15 出版日期:2025-07-25 发布日期:2025-07-28
通讯作者: 臧千昊,副教授,博士,E-mail:qhzang@just.edu.cn
作者简介:甘婵(2003—),女,主要研究方向为稀土镁合金,E-mail:2083335860@qq.com。
基金资助:
江苏省高校自然科学基金面上项目(22KJB0003);广东省基础与应用基础研究基金(2020A1515110394)

Effect of solution treatment on microstructure of Mg-6Gd-3Y-1.5Zn-0.6Zr rare earth magnesium alloy

Gan Chan¹, Chen Yi², Zhang Yifei³, Zang Qianhao¹, Chen Hongmei¹

1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang Jiangsu 212003, China;
2. China Academy of Machinery Beijing Research Institute of Mechanical & Electrical Technology Co., Ltd., Beijing 100083, China;
3. ACRE Coking and Refractory Engineering Consulting Corporation, MCC, Dalian Liaoning 116085, China

Received:2025-02-10 Revised:2025-05-15 Online:2025-07-25 Published:2025-07-28

摘要/Abstract

摘要： 研究了铸态Mg-6Gd-3Y-1.5Zn-0.6Zr稀土镁合金在不同固溶处理工艺下的显微组织和长周期堆垛有序(LPSO)相的结构变化规律。结果表明,Mg-6Gd-3Y-1.5Zn-0.6Zr合金的铸态组织主要由α-Mg基体、LPSO相和稀土富集相组成,其中LPSO相具有18R型结构。固溶处理可以减少合金中共晶化合物含量,改变第二相的形态、结构和分布。冷却方式对层片状LPSO相的析出有重要影响,缓慢冷却有助于层片状LPSO相的形成。不同热处理工艺可调控出不同形态LPSO相的合金组织,经500 ℃×12 h炉冷至420 ℃×3 h,水冷后的合金能够形成大量密集层片状14H-LPSO相。

关键词: 镁合金, 热处理, LPSO相, 固溶处理

Abstract: Microstructure of as-cast Mg-6Gd-3Y-1.5Zn-0.6Zr rare earth magnesium alloy under different heat treatment was studied, and the structure change of long-period stacking ordered (LPSO) phase was investigated. The results show that the as-cast microstructure of the tested Mg-6Gd-3Y-1.5Zn-0.6Zr alloy is primarily composed of α-Mg matrix, LPSO phase, and rare earth-rich phases, with the LPSO phase exhibiting an 18R-type structure. Solution treatment can reduce the amount of eutectic compounds in the alloy and change the morphology, structure, and distribution of the secondary phases. The precipitation of lamellar LPSO phases is significantly influenced by the cooling rate, with the formation of lamellar LPSO phases being facilitated by slow cooling. Different LPSO phase morphologies are produced by different heat treatment processes, with a dense lamellar 14H-LPSO structure being formed by treating at 500 ℃ for 12 h followed by furnace cooling to 420 ℃ for 3 h and water cooling.

Key words: magnesium alloy, heat treatment, LPSO phase, solution treatment

中图分类号:

TG146.2

甘婵, 陈懿, 张义飞, 臧千昊, 陈洪美. 固溶处理对Mg-6Gd-3Y-1.5Zn-0.6Zr稀土镁合金组织的影响[J]. 金属热处理, 2025, 50(7): 73-80.

Gan Chan, Chen Yi, Zhang Yifei, Zang Qianhao, Chen Hongmei. Effect of solution treatment on microstructure of Mg-6Gd-3Y-1.5Zn-0.6Zr rare earth magnesium alloy[J]. Heat Treatment of Metals, 2025, 50(7): 73-80.

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固溶处理对Mg-6Gd-3Y-1.5Zn-0.6Zr稀土镁合金组织的影响

Effect of solution treatment on microstructure of Mg-6Gd-3Y-1.5Zn-0.6Zr rare earth magnesium alloy

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