稀土镁合金 Mg-10.5Gd-5Y-1.0Ag-0.5Zr的微观组织调控工艺

doi:10.13251/j.issn.0254-6051.2025.11.018

金属热处理 ›› 2025, Vol. 50 ›› Issue (11): 126-132.DOI: 10.13251/j.issn.0254-6051.2025.11.018

稀土镁合金 Mg-10.5Gd-5Y-1.0Ag-0.5Zr的微观组织调控工艺

杨晓冬¹, 王民旗¹, 吴佩鸿¹, 兰永强¹, 陈明锐¹, 黄永博¹, 刘明旗², 翟又文³

1.国家能源集团新疆能源有限责任公司, 新疆乌鲁木齐 830000;
2.北京许继数字电力技术有限公司, 北京 100085;
3.昆明学院, 云南昆明 650214

收稿日期:2025-06-09 修回日期:2025-09-24 发布日期:2025-12-16
通讯作者: 翟又文,副教授,博士,E-mail:mattech1112@163.com
作者简介:杨晓冬(1984—),男,工程师,主要研究方向为稀土镁合金,E-mail:365589941@qq.com。
基金资助:
云南省科技厅基础研究计划(202101BA070001-002);云南省智能物流装备与系统重点实验室(202449CE340008);云南省沈卫明院士工作站(202505AF350084)

Microstructural control process of rare earth magnesium alloy Mg-10.5Gd-5Y-1.0Ag-0.5Zr

Yang Xiaodong¹, Wang Minqi¹, Wu Peihong¹, Lan Yongqiang¹, Chen Mingrui¹, Huang Yongbo¹, Liu Mingqi², Zhai Youwen³

1. Xinjiang Energy Group Co., Ltd, Urumqi Xinjiang 830000, China;
2. Beijing Xuji Digital Power Technology Co., Ltd., Beijing 100085, China;
3. Kunming University, Kunming Yunnan 650214, China

Received:2025-06-09 Revised:2025-09-24 Published:2025-12-16

摘要/Abstract

摘要： 研究了均匀化处理时间(2~24 h)对稀土镁合金Mg-10.5Gd-5Y-1.0Ag-0.5Zr组织演变行为的影响,并进一步探究了热挤压态稀土镁合金的微结构特征、动态再结晶机理以及强化机制。结果表明:在均匀化处理温度510 ℃下,经过6 h的均匀化处理,晶界析出相Mg₅(GdY)通过原子扩散的方式基本溶入基体中;随着均匀化处理时间的继续增加,晶粒出现逐渐长大的趋势且晶粒内部也会形成析出相。对510 ℃×6 h均匀化处理后的稀土镁合金试样进行400 ℃热挤压变形,稀土镁合金在热挤压过程中通过颗粒诱导形核机制发生连续动态再结晶并形成大量的细小动态再结晶晶粒,与铸态试样相比,动态再结晶晶粒的平均晶粒尺寸从约90.0 μm降至16.2 μm,表现出显著的细晶强化效应。基于颗粒诱导形核机制和溶质拖曳机制,挤压态稀土镁合金的强基面织构弱化,并表现出取向随机化趋势,有利于稀土镁合金的强韧化。

关键词: 稀土镁合金, 颗粒诱导形核, 细晶强化, 动态再结晶, 随机取向

Abstract: Effect of homogenization treatment time (2-24 h) on microstructural evolution of rare earth magnesium alloy Mg-10.5Gd-5Y-1.0Ag-0.5Zr was studied. And the microstructural characteristics, dynamic recrystallization mechanism, and strengthening mechanism of the hot-extruded rare earth magnesium alloy were further explored. The results show that after a homogenization treatment at 510 ℃ for 6 h, the precipitated phase Mg₅(GdY) at the grain boundaries is essentially dissolved into the substrate through atomic diffusion, and prolonged homogenization time leads to the further grain growth and the formation of new precipitates. During hot extrusion at 400 ℃ of rare earth magnesium alloy, following a 510 ℃×6 h homogenization treatment, continuous dynamic recrystallization occurs via the particle stimulated nucleation(PSN) mechanism, and a large number of fine dynamic recrystallized grains are formed, significantly refining grain size from about 90.0 μm (as-cast) to 16.2 μm, exhibiting a significant grain refinement strengthening effect. The extrusion process, influenced by the PSN mechanism and the solute drag mechanism, weakens the strong basal plane texture of the rare earth magnesium alloy, promoting orientation randomization and contributing to the strengthening and toughness of the alloy.

Key words: rare earth magnesium alloy, particle stimulated nucleation, grain refinement strengthening, dynamic recrystallization, random texture

中图分类号:

TG146.22

杨晓冬, 王民旗, 吴佩鸿, 兰永强, 陈明锐, 黄永博, 刘明旗, 翟又文. 稀土镁合金 Mg-10.5Gd-5Y-1.0Ag-0.5Zr的微观组织调控工艺[J]. 金属热处理, 2025, 50(11): 126-132.

Yang Xiaodong, Wang Minqi, Wu Peihong, Lan Yongqiang, Chen Mingrui, Huang Yongbo, Liu Mingqi, Zhai Youwen. Microstructural control process of rare earth magnesium alloy Mg-10.5Gd-5Y-1.0Ag-0.5Zr[J]. Heat Treatment of Metals, 2025, 50(11): 126-132.

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稀土镁合金 Mg-10.5Gd-5Y-1.0Ag-0.5Zr的微观组织调控工艺

Microstructural control process of rare earth magnesium alloy Mg-10.5Gd-5Y-1.0Ag-0.5Zr

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