Effect of Solution Heat Treatment on Microstructure and Hardness of AZ91D Magnesium Alloys with SiC Particles

Chen Shengna; Yang Wei; Yu Huan; Xu Zhifeng; Yan Qingsong; Cai Changchun

doi:10.15980/j.tzzz.2014.02.032

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Effect of Solution Heat Treatment on Microstructure and Hardness of AZ91D Magnesium Alloys with SiC Particles
Vol. 34, Issue 2, Pages: 201-204(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.02.032

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[1]陈胜娜,杨伟,余欢,徐志锋,严青松,蔡长春.固溶处理对SiC_p增强AZ91D镁合金组织及硬度的影响[J].特种铸造及有色合金,2014,34(02):201-204.

Chen Shengna, Yang Wei, Yu Huan, et al. Effect of Solution Heat Treatment on Microstructure and Hardness of AZ91D Magnesium Alloys with SiC Particles. [J]. Special Casting & Nonferrous Alloys 34(2):201-204(2014)
[1]陈胜娜,杨伟,余欢,徐志锋,严青松,蔡长春.固溶处理对SiC_p增强AZ91D镁合金组织及硬度的影响[J].特种铸造及有色合金,2014,34(02):201-204. DOI： 10.15980/j.tzzz.2014.02.032.

Chen Shengna, Yang Wei, Yu Huan, et al. Effect of Solution Heat Treatment on Microstructure and Hardness of AZ91D Magnesium Alloys with SiC Particles. [J]. Special Casting & Nonferrous Alloys 34(2):201-204(2014) DOI： 10.15980/j.tzzz.2014.02.032.

摘要

采用不同固溶温度及保温时间

研究了SiC p增强AZ91D镁合金组织演变及硬度变化行为。结果表明

随固溶温度提高

铸态组织中连续网状β相逐渐消失

汉字状Mg2Si相发生熔断

球化速度加快

400℃时晶界清晰。400℃×16h固溶时

不稳定β相几乎完全固溶至基体中

汉字状Mg2Si球化效果最佳

Al8Mn5相未发生明显变化。400℃×20h固溶后

Mg2Si球化趋势开始减弱

晶粒尺寸出现显著增加。结果表明

β相的消失和Mg2Si相的球化导致合金硬度发生连续下降。400℃×16h后由于固溶强化效果的增加

合金硬度有所提高。

Abstract

With different solution temperature and holding time

the microstructure evolution and microhardness of AZ91D magnesium alloys containing SiC particles were investigated.The results show that the continuous net-likeβphase in initial as-cast ingot disappears gradually with the increase of solution temperature

accompanying with the fragmentation of Mg2Si phase with Chinese script morphology

and spheroidization rate is increased.The grain boundary becomes distinct with the solution temperature of 400 ℃.With solid solution treatment at 400 ℃ for 16h

the unstableβphase is almost dissolved into the matrix phase and the spheroidization of Mg2Si phase exhibits desirable.However

the change of morphology of Al8Mn5 phase can not be observed due to its high decomposition temperature.After solid solution at 400 ℃ for 20h

the spheroidization trend is weakened and the primary grain is coarsened greatly.The value of micro-hardness is decreased continuously as a result of the disappearance ofβphase and spheroidization of Mg2Si phase

while a slight increase of the micro-hardness for the sample at 400℃ for 16h can be observed due to solution strengthening.