Grain Refinement Mechanism of Cast Mg-Al Alloys with MnCO<sub>3</sub> Additions

Duan Siyi; Liu Sheng; Zhang Shichang

doi:10.15980/j.tzzz.2017.04.023

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Grain Refinement Mechanism of Cast Mg-Al Alloys with MnCO₃ Additions
Vol. 37, Issue 4, Pages: 427-431(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.04.023

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[1]段思怡,刘升,张诗昌.MnCO_3细化Mg-Al系铸造合金晶粒的机理[J].特种铸造及有色合金,2017,37(04):427-431.

Duan Siyi, Liu Sheng, Zhang Shichang. Grain Refinement Mechanism of Cast Mg-Al Alloys with MnCO₃ Additions. [J]. Special Casting & Nonferrous Alloys 37(4):427-431(2017)
[1]段思怡,刘升,张诗昌.MnCO_3细化Mg-Al系铸造合金晶粒的机理[J].特种铸造及有色合金,2017,37(04):427-431. DOI： 10.15980/j.tzzz.2017.04.023.

Duan Siyi, Liu Sheng, Zhang Shichang. Grain Refinement Mechanism of Cast Mg-Al Alloys with MnCO₃ Additions. [J]. Special Casting & Nonferrous Alloys 37(4):427-431(2017) DOI： 10.15980/j.tzzz.2017.04.023.

摘要

在Mg-Al合金熔体中添加MnCO

细化剂

研究了MnCO

对铸造Mg-Al系合金晶粒尺寸的影响

并运用"边-边匹配"模型结合热力学与微观组织的分析

探讨了其细化机制。结果表明

MnCO

对铸造Mg-Al合金晶粒有明显的细化作用

且对AZ31合金的细化效果最好。通过"边-边匹配"模型计算及热力学分析可知

经MnCO

变质后

镁液中有可能生成Al

、τ-AlMn化合物

这些化合物与Mg有多对晶体学位向关系

可以作为α-Mg的有效形核质点。

Abstract

The effects of MnCO

addition on grain size of the cast Mg-Al alloys were investigated by adding the refiner into the melt

and the refinement mechanism was described by using the edge-to-edge matching model combined with thermodynamics and microstructure analysis.It can be found that MnCO

has significant refining effect on grain size in as-cast Mg-Al alloys

especially for AZ31 alloy.Based on calculation of the edge-to-edge matching model and thermodynamics analysis of microstructure

the Al

andτ-AlMn phase can be generated from molten magnesium alloys modified by MnCO

which exhibit multiple pairs of ORs with Mg as the potential nucleus of Mg grain.