Grain refinement of Mg-Al based alloys by a new Al-Al4C3-TiC master alloy

Han Guang; Liu Xiangfa; Ding Haimin

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Grain refinement of Mg-Al based alloys by a new Al-Al4C3-TiC master alloy
Issue S1, Pages: 247-249(2008)
Published： 2008 ，
DOI：

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[1]韩广,刘相法,丁海民.Al-Al_4C_3-TiC中间合金对Mg-Al系合金的晶粒细化[J].特种铸造及有色合金,2008(S1):247-249.

Han Guang, Liu Xiangfa, Ding Haimin. Grain refinement of Mg-Al based alloys by a new Al-Al4C3-TiC master alloy. [J]. Special Casting & Nonferrous Alloys (S1):247-249(2008)
[1]韩广,刘相法,丁海民.Al-Al_4C_3-TiC中间合金对Mg-Al系合金的晶粒细化[J].特种铸造及有色合金,2008(S1):247-249. DOI：

Han Guang, Liu Xiangfa, Ding Haimin. Grain refinement of Mg-Al based alloys by a new Al-Al4C3-TiC master alloy. [J]. Special Casting & Nonferrous Alloys (S1):247-249(2008) DOI：

摘要

通过熔体原位反应法制备了一种Al-Al4C3-TiC中间合金。在该中间合金中

Al4C3颗粒被TiC颗粒包围

Al4C3颗粒和TiC颗粒尺寸分别在2.5

.0μm和0.5

.5μm之间。试验表明

该中间合金对AZ31有良好的细化作用。当加入1%的中间合金时

AZ31的晶粒尺寸由原来的1050μm减小到260μm。Al4C3颗粒或者Al4C3颗粒团簇充当了α-Mg的异质形核核心

这导致了明显的晶粒细化。

Abstract

A type of Al-Al4C3-TiC master alloy was fabricated by melt in-situ reaction. In the master alloy

Al4C3 particles with a size of 2.5-8 μm were surrounded by TiC particles with a size of 0.5-1.5μm. Grain refinement experiments reveal that the master alloy can refine AZ31 efficiently. After addition of 1wt.% Al-Al4C3-TiC master alloy

the grain size of AZ31 was decreased from 1 050 μm to 260μm. Al4C3 particles or Al4C3 particle clusters act as the nucleation sites leading to the evident grain refinement.