Refining Mechanism of Rare Earth Gd on Primary α Phase in Semisolid A356 Alloy

Liu Zheng; Chen Qingchun

doi:10.15980/j.tzzz.2013.09.008

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Refining Mechanism of Rare Earth Gd on Primary α Phase in Semisolid A356 Alloy
Vol. 33, Issue 9, Pages: 793-796(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.09.008

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[1]刘政,谌庆春.Gd对半固态A356合金初生α相的细化机制[J].特种铸造及有色合金,2013,33(09):793-796.

Liu Zheng, Chen Qingchun. Refining Mechanism of Rare Earth Gd on Primary α Phase in Semisolid A356 Alloy. [J]. Special Casting & Nonferrous Alloys 33(9):793-796(2013)
[1]刘政,谌庆春.Gd对半固态A356合金初生α相的细化机制[J].特种铸造及有色合金,2013,33(09):793-796. DOI： 10.15980/j.tzzz.2013.09.008.

Liu Zheng, Chen Qingchun. Refining Mechanism of Rare Earth Gd on Primary α Phase in Semisolid A356 Alloy. [J]. Special Casting & Nonferrous Alloys 33(9):793-796(2013) DOI： 10.15980/j.tzzz.2013.09.008.

摘要

选用稀土Gd作为A356合金的细化剂

合金熔体分别在Al-Gd共晶温度之上和共晶温度之下保温若干时间

研究了稀土-铝共晶反应对A356合金初生α相形貌和晶粒尺寸的影响。结果表明

A356-Gd合金在Al-Gd共晶温度之下保温

可获得较理想的初生α相形貌和较小的晶粒尺寸。通过计算二维错配度

发现共晶反应产物GdAl3可作为α-Al的异质形核质点而起到细化晶粒的作用。

Abstract

The rare earth Gd was selected as the refiner for A356 alloy

and the alloy melt was held with 10℃ up and below the eutectic temperature for several minutes before the pouring to observe effects of RE-Al eutectic temperature on the morphology and size of the primaryαphase in A356 alloy.The results indicate that the desirable morphology and smaller grain size of primaryαphase can be obtained with holding below the eutectic temperature of Al-Gd for the A356-Gd alloy.By calculating the planar disregistry

it is found that the eutectic reaction GdAl3 can be used as the heterogeneous nuclei of α-Al to refine grain size.