Effects of Weak Stirring Power on Microstructure of Semi-solid AlSi7Mg Alloy Slurry

Zhao Zhenduo; Mao Weimin; Liu Zheng

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Effects of Weak Stirring Power on Microstructure of Semi-solid AlSi7Mg Alloy Slurry
Issue 1, Pages: 31-33(2008)
Published： 2008 ，
DOI：

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[1]赵振铎,毛卫民,刘政.弱搅拌功率对半固态AlSi7Mg合金浆料组织的影响[J].特种铸造及有色合金,2008(01):31-33+3.

Zhao Zhenduo, Mao Weimin, Liu Zheng. Effects of Weak Stirring Power on Microstructure of Semi-solid AlSi7Mg Alloy Slurry. [J]. Special Casting & Nonferrous Alloys (1):31-33(2008)
[1]赵振铎,毛卫民,刘政.弱搅拌功率对半固态AlSi7Mg合金浆料组织的影响[J].特种铸造及有色合金,2008(01):31-33+3. DOI：

Zhao Zhenduo, Mao Weimin, Liu Zheng. Effects of Weak Stirring Power on Microstructure of Semi-solid AlSi7Mg Alloy Slurry. [J]. Special Casting & Nonferrous Alloys (1):31-33(2008) DOI：

摘要

采用低过热度浇注和弱电磁搅拌制备浆料技术制备半固态AlSi7Mg合金浆料

研究了弱搅拌功率对合金浆料初生相α-Al形貌的影响以及浆料组织的径向分布。研究结果表明

在低过热度浇注和弱电磁搅拌条件下

当AlSi7Mg合金液在浇注温度为630℃、搅拌功率为0.36kW时可制备出初生α-Al相形貌呈小而圆整的球状晶粒、组织分布均匀、直径为127mm的AlSi7Mg合金浆料;在低过热度浇注和弱电磁搅拌条件下

适当提高搅拌功率可改善初生α-Al相形貌

但当搅拌功率提高到一定程度

再增大搅拌功率

初生α-Al相形貌并没有得到进一步改善;从半固态AlSi7Mg合金浆料组织的径向分布看

由边部到心部

浆料的组织形貌从枝晶组织向蔷薇状组织再向球状组织演化。

Abstract

The effects of weak power on the morphology of α-Al phase in slurry and radial distribution of microstructure of slurry which was prepared by low super-heating pouring and weak electromagnetic stirring have been observed.The results indicate that the AlSi7Mg alloy slurry with 127 μm in diameters and uniformly distributed microstructure in which fine spherical primary α-Al phase is generated can be prepared successfully with pouring at 630 ℃ and stirring power of 0.36 kW in the condition of low super-heating pouring and weak electromagnetic stirring.Meanwhile

the morphology of primary α-Al phase can be further spheroidized with the increase of stirring power

however

it has been little improved with the stirring power increase to a certain value.The microstructure of semi-solid AlSi7Mg alloy slurry is converted from dendrite into rosette-like structure into spherical structure from edge to center of slurry in radial direction.