金属热处理 ›› 2024, Vol. 49 ›› Issue (5): 36-39.DOI: 10.13251/j.issn.0254-6051.2024.05.006

• 材料研究 • 上一篇    下一篇

多次闭模压缩对不同Si含量AZ31合金显微组织和耐磨性能的影响

郭炜, 管博, 陈威, 吴丹   

  1. 江西省科学院应用物理研究所 铜基新材料江西省重点实验室, 江西 南昌 330096
  • 收稿日期:2023-11-21 修回日期:2024-03-14 出版日期:2024-05-25 发布日期:2024-06-28
  • 作者简介:郭 炜(1981—),男,副研究员,博士,主要研究方向为有色金属塑性加工,E-mail:guowei66@sohu.com。
  • 基金资助:
    江西省科学院省级科技计划包干制项目(2021YSBG22007)

Effect of multi-cycle closed die compression on microstructure and wear resistance of AZ31 alloy with different Si contents

Guo Wei, Guan Bo, Chen Wei, Wu Dan   

  1. Jiangxi Key Laboratory of Advanced Copper-based Materials, Institute of Applied Physics, Jiangxi Academy of Sciences, Nanchang Jiangxi 330096, China
  • Received:2023-11-21 Revised:2024-03-14 Online:2024-05-25 Published:2024-06-28

摘要: 将Si添加到AZ31熔体制备AZ31-2%Si合金,采用高温多次闭模压缩加工AZ31和AZ31-2%Si合金,研究其微观组织和耐磨性能。结果表明,铸态AZ31合金相组成为Mg与Mg17Al12,而铸态AZ31-2%Si合金相组成为Mg、Mg17Al12与Mg2Si。400 ℃五次压缩后,AZ31合金晶粒由粗大等轴晶转变为细小再结晶,Mg17Al12相溶解,AZ31-2%Si合金中Mg17Al12相绝大部分溶解到基体中,粗大Mg2Si相破碎成细小的颗粒并弥散分布在晶界周围。滑动摩擦2500 m后,铸态、五次压缩态AZ31合金的磨损量分别为26.4、22.1 mg,铸态、五次压缩态AZ31-2%Si合金的磨损量分别为22.7、21.0 mg,AZ31合金耐磨性能提高的主要因素是晶粒细化,AZ31-2%Si合金耐磨性能提高的主要因素是晶粒细化、Mg2Si相细化及其弥散分布。

关键词: 镁合金, 闭模压缩, 微观组织, Mg2Si相, 耐磨性

Abstract: AZ31-2%Si alloy was prepared by adding Si to the AZ31 melt. AZ31 and AZ31-2%Si alloy were processed by multi-cycle closed die compression at high temperature, and the microstructure and wear resistance were studied. The results show that the as-cast AZ31 alloy is composed of Mg and Mg17Al12, while the as-cast AZ31-2%Si alloy is composed of Mg, Mg17Al12 and Mg2Si. After five cycles compression at 400 ℃, grain of the AZ31 alloy is transformed from coarse equiaxed grain to fine recrystallized grain and Mg17Al12 phase is dissolved, and the vast majority of Mg17Al12 phase in the AZ31-2%Si alloy is dissolved into the matrix, the coarse Mg2Si phase is broken into fine particles and dispersed around grain boundaries. After sliding friction for 2500 m, the wear loss of the as-cast and five cycles compressed AZ31 alloy is 26.4 mg and 22.1 mg, respectively. The wear loss of the as-cast and five cycles compressed AZ31-2%Si alloy is 22.7 mg and 21.0 mg, respectively. The main factor for improving of wear resistance of the AZ31 alloy after compression is grain refinement. The main factors for improving of wear resistance of the AZ31-2%Si alloy after compression are grain refinement, Mg2Si phase refinement and its dispersive distribution.

Key words: Mg alloy, closed die compression, microstructure, Mg2Si phase, wear resistance

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