Evolution of Primary Phase in A357 Semi-solid Aluminum Alloy During Reheating and Forming Process

Wang Jianfu; Yang Yitao; Zhang Henghua; Shao Guangjie

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Evolution of Primary Phase in A357 Semi-solid Aluminum Alloy During Reheating and Forming Process
Issue 3, Pages: 189-192(2008)
Published： 2008 ，
DOI：

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[1]王建甫,杨弋涛,张恒华,邵光杰.A357半固态初生相在二次加热和成形过程中的演变行为[J].特种铸造及有色合金,2008(03):189-192+161.

Wang Jianfu, Yang Yitao, Zhang Henghua, et al. Evolution of Primary Phase in A357 Semi-solid Aluminum Alloy During Reheating and Forming Process. [J]. Special Casting & Nonferrous Alloys (3):189-192(2008)
[1]王建甫,杨弋涛,张恒华,邵光杰.A357半固态初生相在二次加热和成形过程中的演变行为[J].特种铸造及有色合金,2008(03):189-192+161. DOI：

Wang Jianfu, Yang Yitao, Zhang Henghua, et al. Evolution of Primary Phase in A357 Semi-solid Aluminum Alloy During Reheating and Forming Process. [J]. Special Casting & Nonferrous Alloys (3):189-192(2008) DOI：

摘要

为了认识半固态成形微观组织形貌的演变规律

较为系统地了解初生α相的演变和充型行为

对A357半固态铝合金坯料进行了二次加热和压铸成形试验

用量化的方法分析了它们的组织特征。发现二次加热过程中

初生相随着加热温度的上升和时间的延长

出现了合并、长大和球化;在充型过程中

粗大的α相晶粒容易在拐角和浇口处发生聚集

液相较多的地方容易产生比较多的细小α晶粒。

Abstract

The microstructure of reheated semi-solid A357 alloy billets in die casting was systematically analyzed by the quantitative method to understand the evolution and filling behavior of primary α phase.The results indicate that the primary α phase is coalesced and grown and spheroidized during reheating process with the increase of temperature and time.Coarse primary α phase is aggregated at the corner and at pouring position during filling process

while fine primary α phase appeares in the place with much liquid phase.