金属热处理 ›› 2025, Vol. 50 ›› Issue (9): 156-160.DOI: 10.13251/j.issn.0254-6051.2025.09.024

• 工艺研究 • 上一篇    下一篇

时效时间对Mg-10Gd-2Sm-1Y-0.5Zr合金组织与性能的影响

李佳傲1, 黄硕1, 李瑞红1,2,3, 赵莉萍1,2,3, 王海燕1,2,3, 杨礼林1,2,3, 金自力1,2,3   

  1. 1.内蒙古科技大学 材料科学与工程学院, 内蒙古 包头 014010;
    2.内蒙古自治区新金属材料重点实验室, 内蒙古 包头 014010;
    3.内蒙古科技大学 轻稀土资源绿色提取与高效利用教育部重点实验室, 内蒙古 包头 014010
  • 收稿日期:2025-03-09 修回日期:2025-07-15 出版日期:2025-09-25 发布日期:2025-10-13
  • 通讯作者: 李瑞红,副教授,博士,E-mail: liruihong@imust.edu.cn
  • 作者简介:李佳傲(2000—),男,硕士研究生,主要研究方向为稀土镁合金材料,E-mail: 15243457885@163.com。
  • 基金资助:
    国家自然科学基金(52461027);内蒙古自治区直属高校基本科研业务费(2022-153);内蒙古自治区自然科学基金(2023MS05038,2024LHMS05054);内蒙古自治区军民融合重点科研项目及软科学研究项目(JMZD202304)

Effect of aging time on microstructure and mechanical properties of Mg-10Gd-2Sm-1Y-0.5Zr alloy

Li Jiaao1, Huang Shuo1, Li Ruihong1,2,3, Zhao Liping1,2,3, Wang Haiyan1,2,3, Yang Lilin1,2,3, Jin Zili1,2,3   

  1. 1. School of Materials Science and Engineering, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
    2. Key Laboratory of Advanced Metal Materials of Inner Mongolia Autonomous Region, Baotou Inner Mongolia 014010, China;
    3. Key Laboratory of Green Extraction & Efficient Utilization of Light Rare-Earth Resources, Ministry of Education, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China
  • Received:2025-03-09 Revised:2025-07-15 Online:2025-09-25 Published:2025-10-13

摘要: 对Mg-10Gd-2Sm-1Y-0.5Zr合金进行460 ℃×4 h固溶处理,随后在200 ℃下进行不同时间(4、6、8、12 h)的时效处理。采用金相显微镜、扫描电镜对合金组织进行观察,并对其硬度和拉伸性能进行测试。结果表明,随着时效时间的延长,合金晶粒逐渐长大,合金中第二相不断增多,但当时效时间过长时,晶粒异常长大。时效态Mg-10Gd-2Sm-1Y-0.5Zr合金中第二相为Mg5Gd和MgGd3,同时合金中还存在团簇的富Zr粒子,分布在晶界上。当时效处理6 h时,第二相颗粒细小且弥散分布,合金综合性能最佳,硬度为90 HV,抗拉强度为266 MPa,屈服强度为205 MPa,伸长率为11%。

关键词: 稀土镁合金, 时效处理, 组织, 力学性能

Abstract: Mg-10Gd-2Sm-1Y-0.5Zr alloy was solution treated at 460 ℃ for 4 h, and then aged at 200 ℃ for different time (4, 6, 8, and 12 h). The microstructure of the alloy was observed by using metallographic microscope and scanning electron microscope, and the hardness and tensile properties were tested. The results show that with the extension of aging time, the grain of the alloy gradually increases, and the second phase in the alloy increases continuously. However, when the aging time is too long, the grain increases abnormally. In the aged Mg-10Gd-2Sm-1Y-0.5Zr alloy, the second phases are Mg5Gd and MgGd3. Meanwhile, there are also clustered Zr-rich particles in the alloy, which are distributed at the grain boundaries. When aged for 6 h, the second-phase particles are fine and dispersedly distributed, and the alloy exhibits the best comprehensive properties, with hardness of 90 HV, tensile strength of 266 MPa, yield strength of 205 MPa and elongation of 11%.

Key words: rare earth magnesium alloy, aging treatment, microstructure, mechanical properties

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