Effect of the Solidification Rate on the Microstructure of Directionally Solidified Al-17.5wt%In Alloy In High Temperature Gradient

CUI Hongbao1; LI Changyun1; WANG Kuangfei1; MI Guofa1; GUO Jingjie2; SU Yanqing2

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Effect of the Solidification Rate on the Microstructure of Directionally Solidified Al-17.5wt%In Alloy In High Temperature Gradient
Issue S1, Pages: 81-84(2008)
Published： 2008 ，
DOI：

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[1]崔红保,历长云,王狂飞,米国发,郭景杰,苏彦庆,傅恒志.凝固速度对高温度梯度定向凝固Al-17.5In合金组织的影响[J].特种铸造及有色合金,2008(S1):81-84.

CUI Hongbao1, LI Changyun1, WANG Kuangfei1, et al. Effect of the Solidification Rate on the Microstructure of Directionally Solidified Al-17.5wt%In Alloy In High Temperature Gradient. [J]. Special Casting & Nonferrous Alloys (S1):81-84(2008)
[1]崔红保,历长云,王狂飞,米国发,郭景杰,苏彦庆,傅恒志.凝固速度对高温度梯度定向凝固Al-17.5In合金组织的影响[J].特种铸造及有色合金,2008(S1):81-84. DOI：

CUI Hongbao1, LI Changyun1, WANG Kuangfei1, et al. Effect of the Solidification Rate on the Microstructure of Directionally Solidified Al-17.5wt%In Alloy In High Temperature Gradient. [J]. Special Casting & Nonferrous Alloys (S1):81-84(2008) DOI：

摘要

在高温度梯度下对Al-17.5In偏晶合金进行定向凝固

分析了其定向凝固组织形成机制

考察了不同凝固速度对Al-17.5In偏晶合金凝固组织的影响

获得了高温度梯度定向凝固条件下微观组织的演化规律

即在固定的高温度梯度下

随着抽拉速度的增大

第二相形态演化的过程依次为:规则的纤维状

发生颈缩的纺锤状

粗化的球状

均匀弥散分布于基体中。纤维间距随着凝固速度的增大而减小。

Abstract

In the condition of high temperature gradient

the formation mechanism of microstructure of directionally solidified Al-17.5wt%In monotectic alloy is analyzed. The effect of the solidification rate on the microstructure of directionally solidified Al-17.5wt%In monotectic alloy is examined. The results show that the regular fibre of L2 phase of the directionally solidified Al-17.5wt% In alloy changes from fibre

spindle fibre

periodical and regular array of In droplets to random dispersion of In droplets in the aluminum matrix with increasing growth rate. At the same time

the fibre spacing decreases with the increasing solidification rate.