固溶时间对触变成形AZ63镁合金组织和力学性能的影响

祁晔思; 陈体军; 李鸳宁; 张素卿

doi:10.15980/j.tzzz.2013.12.028

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固溶时间对触变成形AZ63镁合金组织和力学性能的影响
Effects of Solution Treatment Time on Microstructure and Mechanical Properties of Thixoformed AZ63 Magnesium Alloy
2013年33卷第12期页码：1127-1131
纸质出版日期： 2013 ，
DOI： 10.15980/j.tzzz.2013.12.028

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[1]祁晔思,陈体军,李鸳宁,张素卿.固溶时间对触变成形AZ63镁合金组织和力学性能的影响[J].特种铸造及有色合金,2013,33(12):1127-1131.

Qi Yesi, Chen Tijun, Li Yuanning, et al. Effects of Solution Treatment Time on Microstructure and Mechanical Properties of Thixoformed AZ63 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2013,33(12):1127-1131.
[1]祁晔思,陈体军,李鸳宁,张素卿.固溶时间对触变成形AZ63镁合金组织和力学性能的影响[J].特种铸造及有色合金,2013,33(12):1127-1131. DOI： 10.15980/j.tzzz.2013.12.028.

Qi Yesi, Chen Tijun, Li Yuanning, et al. Effects of Solution Treatment Time on Microstructure and Mechanical Properties of Thixoformed AZ63 Magnesium Alloy[J]. Special Casting & Nonferrous Alloys, 2013,33(12):1127-1131. DOI： 10.15980/j.tzzz.2013.12.028.

摘要

研究了在430℃固溶温度下不同固溶时间对触变成形AZ63镁合金组织和力学性能的影响。结果表明

固溶处理使得二次凝固组织中共晶β相逐渐溶解。固溶处理过程分为3个阶段:β相的溶解及颗粒的快速粗化阶段（固溶0.5h前）、颗粒的正常长大阶段（1

2h）和颗粒快速长大阶段（24

6h）。在固溶起始阶段

抗拉强度和伸长率快速提升;随着固溶的进行其增长速率减缓

然后降低。在430℃固溶12h时其抗拉强度和伸长率达到最大值

分别为341 MPa和17.8%。同时

金属型铸造相比于触变成形来说

其固溶进程更加缓慢。

Abstract

Effects of solution treatment time on microstructure and mechanical properties of thixoformed AZ63Magnesium alloy at 430℃ were investigated.The results indicate that the eutecticβphase in secondarily solidified structures is dissolved into the primaryαphase after solution treatment.The solution treatment of thixoformed AZ63magnesium alloy can be divided into three stages:dissolution of eutectic βphase and coarsening of the particles（

0.5h）

normal growth of the particles（1h

2h）

and rapid growth of the particles（24h

6h）.In the initial stage of solution treatment

the tensile strength and elongation of the alloy are increased rapidly.As increasing in the solution treatment time

the tensile strength and elongation of the thixo-formed AZ63are increased firstly and then decreased.The tensile strength and elongation reach the maximum values of 341MPa and 17.8%

respectively

with solid solution at 430℃for 12h.The solution treatment process of permanent mold casting is slower than that of thixoforming.