Mg2Si强化相对AZ31镁合金挤压组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2020.04.008

金属热处理 ›› 2020, Vol. 45 ›› Issue (4): 40-44.DOI: 10.13251/j.issn.0254-6051.2020.04.008

Mg₂Si强化相对AZ31镁合金挤压组织与力学性能的影响

郑留伟^1,2, 梁伟^1,2,3, 张慧云^2,3, 聂慧慧^2,3, 郝欣为^2,3

1. 太原理工大学分析测试中心, 山西太原 030024;
2. 先进镁基材料山西省重点实验室, 山西太原 030024;
3. 太原理工大学材料科学与工程学院, 山西太原 030024

收稿日期:2019-09-27 出版日期:2020-04-25 发布日期:2020-05-08
通讯作者: 梁伟,教授,博士生导师,E-mail:liangwei@tyut.edu.cn
作者简介:郑留伟(1982—),男,副教授,博士,主要从事镁合金材料开发与塑性成形研究,E-mail:zlwsmco@163.com
基金资助:
国家自然科学基金(U1810208);山西省科技重大专项(20181101008);山西省高等学校科技创新项目(201804033)

Effect of Mg₂Si phase on microstructure and mechanical properties of as-extruded AZ31 magnesium alloy

Zheng Liuwei^1,2, Liang Wei^1,2,3, Zhang Huiyun^2,3, Nie Huihui^2,3, Hao Xinwei^2,3

1. Instrumental Analysis Center of Taiyuan University of Technology, Taiyuan Shanxi 030024, China;
2. Shanxi Key Laboratory of Advanced Magnesium-based Materials, Taiyuan Shanxi 030024, China;
3. School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan Shanxi 030024, China

Received:2019-09-27 Online:2020-04-25 Published:2020-05-08

摘要/Abstract

摘要： 通过Al-Si中间合金取代Al添加,并经热挤压成形,在AZ31镁合金中引入Mg₂Si强化相。采用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射分析(XRD)、电子万能试验机等研究了Mg₂Si强化相对AZ31镁合金挤压组织与力学性能的影响。结果表明,添加Al-Si中间合金后的Mg-3(Al-Si)-Zn挤压组织呈现明显的双峰分布特征,Mg₂Si颗粒相可通过粒子激发形核(PSN)作用促进动态再结晶,在碎化的Mg₂Si颗粒相周围,合金组织显著细化,形成明显异于其他正常尺寸晶粒的细晶区。引入Mg₂Si强化相后,Mg-3(Al-Si)-Zn挤压态合金的屈服强度和抗拉强度都得到提高,分别达到175和269 MPa,同时伸长率略有降低。

关键词: AZ31镁合金, Mg₂Si强化相, 微观组织, 力学性能

Abstract: Mg₂Si phase was introduced into AZ31 magnesium alloy by replacing Al with Al-Si master alloy combined with hot extrusion. Effect of Mg₂Si phase on the microstructure and mechanical properties of AZ31 magnesium alloy was studied by optical microscope (OM), scanning electron microscopy (SEM), X-ray diffraction analysis (XRD) and electronic universal testing machine.The results show that the Mg-3(Al-Si)-Zn extrusion microstructure presents obvious bimodal distribution, and the Mg₂Si particle phase can promote dynamic recrystallization by particle stimulated nucleation (PSN), and the microstructure is refined dramatically around Mg₂Si particles. The yield and tensile strength of Mg-3(Al-Si)-Zn alloy are improved to 175 MPa and 269 MPa, respectively, while the elongation decreases slightly after the introduction of Mg₂Si strengthening phase.

Key words: AZ31 magnesium alloy, Mg₂Si strengthening phase, microstructure, mechanical properties

中图分类号:

TG146.2

郑留伟, 梁伟, 张慧云, 聂慧慧, 郝欣为. Mg₂Si强化相对AZ31镁合金挤压组织与力学性能的影响[J]. 金属热处理, 2020, 45(4): 40-44.

Zheng Liuwei, Liang Wei, Zhang Huiyun, Nie Huihui, Hao Xinwei. Effect of Mg₂Si phase on microstructure and mechanical properties of as-extruded AZ31 magnesium alloy[J]. Heat Treatment of Metals, 2020, 45(4): 40-44.

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Mg₂Si强化相对AZ31镁合金挤压组织与力学性能的影响

Effect of Mg₂Si phase on microstructure and mechanical properties of as-extruded AZ31 magnesium alloy

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