Microstructural Evolution of Semi-Solid AZ61 Magnesium Alloy during Reheating Process

Q3 Materials Science
Yan Hong, Zhang Fayun
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引用次数: 4

Abstract

AZ31 magnesium semisolid billets were prepared by a self-designed wavelike vibration sloping plate device,and an ideal globular or near-globular microstructure can be obtained by wavelike vibration sloping plate technique.The results show that,with the increase of reheating temperature and the prolongation of holding time,the liquid fraction in semisolid microstructure increases,and the solid phase grows gradually and spheroidises.The reheating microstructures at 580 ℃ and 610 ℃ are not suitable for thixoforming.The optimum reheating process parameters suitable for thixoforming are 590 ℃ for 40-60min or 600 ℃ for 30 min,under which the average grain diameter is 58-61 μm and solid fraction is about 87%.The lattice diffusion resulting in the variation of grain size is the dominant atomic diffusion mechanism of reheating.The solid-liquid interfacial tension results in the variation of globular or near-globular shape.
半固态AZ61镁合金在再加热过程中的组织演变
采用自行设计的波状振动斜板装置制备AZ31镁合金半固态方坯,采用波状振动斜板技术可获得理想的球状或近球状组织。结果表明:随着再加热温度的升高和保温时间的延长,半固态组织中液相比例增大,固相逐渐增大并球化;580℃和610℃的再加热组织不适合触变成形。触变成形的最佳再加热工艺参数为590℃、40 ~ 60min或600℃、30min,平均晶粒直径为58 ~ 61 μm,固相分数为87%左右。导致晶粒尺寸变化的晶格扩散是再加热过程中主要的原子扩散机制。固液界面张力的作用使其呈球状或近球状。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
1.70
自引率
0.00%
发文量
1
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