半固态ZA96镁合金部分重熔过程中的组织演变

李春; 董晓刚; 袁训锋; 刘彦峰; 张美丽; 周春生; 李元东

doi:10.15980/j.tzzz.2015.03.013

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半固态ZA96镁合金部分重熔过程中的组织演变
Microstructure Evolution of Semi-Solid ZA96 Magnesium Alloy During Partial Remelting Process
2015年35卷第3期页码：268-271
纸质出版日期： 2015 ，
DOI： 10.15980/j.tzzz.2015.03.013

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[1]李春,董晓刚,袁训锋,刘彦峰,张美丽,周春生,李元东.半固态ZA96镁合金部分重熔过程中的组织演变[J].特种铸造及有色合金,2015,35(03):268-271.

Li Chun, Dong Xiaogang, Yuan Xunfeng, et al. Microstructure Evolution of Semi-Solid ZA96 Magnesium Alloy During Partial Remelting Process[J]. Special Casting & Nonferrous Alloys, 2015,35(3):268-271.
[1]李春,董晓刚,袁训锋,刘彦峰,张美丽,周春生,李元东.半固态ZA96镁合金部分重熔过程中的组织演变[J].特种铸造及有色合金,2015,35(03):268-271. DOI： 10.15980/j.tzzz.2015.03.013.

Li Chun, Dong Xiaogang, Yuan Xunfeng, et al. Microstructure Evolution of Semi-Solid ZA96 Magnesium Alloy During Partial Remelting Process[J]. Special Casting & Nonferrous Alloys, 2015,35(3):268-271. DOI： 10.15980/j.tzzz.2015.03.013.

摘要

对自孕育法制备ZA96镁合金半固态坯料进行了部分重熔

研究了等温温度和保温时间对微观组织演变的影响。结果表明

随着等温温度增加和保温时间延长

半固态组织中固相率降低

其晶粒尺寸和圆整度呈先减小后增大的变化趋势。在530℃保温20min可获得理想的半固态组织

其平均晶粒尺寸、圆整度和固相率分别为75.69μm、1.45和58%。保温10min左右

其晶粒的粗化、枝晶臂合并及分离基本结束

其后晶粒发生球化、吞并和长大

其长大规律符合Ostwald熟化理论。

Abstract

The semi-solid billets of ZA96 magnesium alloy prepared by self-inoculation method were remelted partially

and effects of microstructure on remelting temperature and holdingl time were investigated.The result shows that with increasing in partial temperature and holding time

solid phase fraction is decreased

and the grain size and roundness are decreased firstly

and then increased.With partial temperature of 530 ℃for 20 min

the grain size

roundness and solid fraction reach 75.69μm、1.45and58%

respectively.Grain coarsening

merge of dendrite arm and grain separation are nearly completely with holding for 10 min.After 10 min

the microstructure evolution follows by the Ostwald ripening mechansim.