Effect of Semi-Solid Isothermal Heat Treatment on the Microstructure andPerformance of In-Situ Mg<sub>2</sub>Si/AZ91 Composites

ZHAO Qiqiang; GAO Yimin; YANG Shasha; XIAO Peng

doi:10.7652/xjtuxb202210019

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Effect of Semi-Solid Isothermal Heat Treatment on the Microstructure andPerformance of In-Situ Mg₂Si/AZ91 Composites

更新时间：2025-07-09

- Effect of Semi-Solid Isothermal Heat Treatment on the Microstructure andPerformance of In-Situ Mg₂Si/AZ91 Composites
- Vol. 56, Issue 10, Pages: 190-200(2022)
- 作者机构：
  
  1. 西安交通大学金属材料强度国家重点实验室,西安,710049
  2. 西安交通大学铸造及耐磨材料研究所,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202210019
  CLC： TB333
- Online First：10 October 2022，
  
  Published：2022
- 稿件说明：
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ZHAO Qiqiang, GAO Yimin, YANG Shasha, et al. Effect of Semi-Solid Isothermal Heat Treatment on the Microstructure andPerformance of In-Situ Mg₂Si/AZ91 Composites[J]. 2022, 56(10): 190-200. DOI: 10.7652/xjtuxb202210019.
DOI：

ZHAO Qiqiang, GAO Yimin, YANG Shasha, et al. Effect of Semi-Solid Isothermal Heat Treatment on the Microstructure andPerformance of In-Situ Mg₂Si/AZ91 Composites[J]. 2022, 56(10): 190-200. DOI: 10.7652/xjtuxb202210019. DOI：

摘要

为解决高体积分数Mg

Si增强镁基复合材料中初生Mg

Si相尺寸粗大导致的复合材料力学性能不佳的问题

提出了等温热处理细化Mg

Si形貌的方法。研究了等温热处理对体积分数为10%的Mg

Si/AZ91复合材料中Mg

Si形貌、基体组织及硬度的影响规律

并揭示其演化机理。结果表明:在等温热处理过程中

初生Mg

Si相曲率较小处优先溶解

导致初生Mg

Si相在枝晶壁处熔断形成独立的颗粒

随后转变为具有最低表面能的球状

随着保温时间的延长

发生合并长大。对复合材料进行不同参数的等温热处理后发现

在510 ℃保温60 min后

初生Mg

Si相的细化效果最好

颗粒尺寸达到30.6 μm

较原始试样减小了58.6%。在热处理过程中

α-Mg枝晶与沿晶界分布的Mg

相发生成分均匀化

α-Mg晶界圆整化并且晶粒尺寸减小; 复合材料硬度在等温热处理后显著降低

但随着初生Mg

Si相和的α-Mg晶粒的细化

硬度有所回升

其硬度变化的主要机制是固溶强化、硬质相消失、细晶强化的共同作用。该研究为Mg

Si/AZ91复合材料形貌改善以及性能提升提供了实验基础和理论依据。

Abstract

An isothermal heat treatment method is proposed to refine Mg

Si size

so as to solve the problem of poor mechanical properties caused by coarse size of primary Mg

Si phase in Mg matrix composites reinforced with high volume fraction Mg

Si. In this paper

the effects of semi-solid isoth

ermal heat treatment on the morphology of Mg

matrix microstructure and hardness of Mg

Si/AZ91 composites with 10% volume fraction are studied

and its evolution mechanism is revealed. The results show that the primary Mg

Si phase with low curvature dissolves preferentially during the isothermal heat treatment process

resulting in the fusing and forming independent particles at the dendrite wall

and then transforms into spherules with the lowest surface energy. With the extension of holding time

the primary Mg

Si phase grows by merging. After isothermal treatment with different parameters

the primary Mg

Si phase has the best refinement effect with a particle size of 30.6 μm after being kept at 510 ℃ for 60 min

reduced by 58.6%. During the heat treatment

α-Mg dendrite homogenizes with Mg

phase distributed along grain boundary

and α-Mg grains are spheroidizing and the grains size decreases. At the same time

it is found that the hardness of the composite decreases obviously after the isothermal heat treatment

but increases with the refinement of the primary Mg

Si and the α-Mg grains. The hardness change is ascribed to the interaction of solution strengthening

hard phase disappearing and grain refinement strengthening. This paper provides experimental and theoretical basis for improving the morphology and properties of Mg

Si/AZ91 composites.

关键词

Keywords

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Effect of Semi-Solid Isothermal Heat Treatment on the Microstructure andPerformance of In-Situ Mg2Si/AZ91 Composites

DOI：10.7652/xjtuxb202210019

摘要

Abstract

关键词

Keywords

references

Effect of Semi-Solid Isothermal Heat Treatment on the Microstructure andPerformance of In-Situ Mg₂Si/AZ91 Composites