Effects of Mn on Iron Phase Morphology and Phase Diagram Analysis in A356 Alloy

Liu Tao; Ding Hai; Zhao Jianhua

doi:10.15980/j.tzzz.2013.09.024

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Effects of Mn on Iron Phase Morphology and Phase Diagram Analysis in A356 Alloy
Vol. 33, Issue 9, Pages: 864-867(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.09.024

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[1]刘涛,丁海,赵建华.Mn对铸造A356合金中Fe相形貌的影响和相图分析[J].特种铸造及有色合金,2013,33(09):864-867.

Liu Tao, Ding Hai, Zhao Jianhua. Effects of Mn on Iron Phase Morphology and Phase Diagram Analysis in A356 Alloy. [J]. Special Casting & Nonferrous Alloys 33(9):864-867(2013)
[1]刘涛,丁海,赵建华.Mn对铸造A356合金中Fe相形貌的影响和相图分析[J].特种铸造及有色合金,2013,33(09):864-867. DOI： 10.15980/j.tzzz.2013.09.024.

Liu Tao, Ding Hai, Zhao Jianhua. Effects of Mn on Iron Phase Morphology and Phase Diagram Analysis in A356 Alloy. [J]. Special Casting & Nonferrous Alloys 33(9):864-867(2013) DOI： 10.15980/j.tzzz.2013.09.024.

摘要

采用OM、XRD、SEM、EDS和Thermal-calc研究了不同Mn含量对A356合金中铁相形貌的影响并进行了相图分析。结果表明

在结晶凝固过程中

Mn与Fe形成新的化合物

使富Fe相由针状的β-Al5FeSi相转变成颗粒状或汉字状的α-Al（Fe

Mn）Si相;A356铝合金凝固过程的结晶相为:α-Al、α-Al（Mn

Fe）Si、β-Al5FeSi和Mg2Si。相图分析发现

增加Mn含量使得α-Al（Mn

Fe）Si相开始析出温度升高

有利于α-Al（Mn

Fe）Si相生长

形成树枝状或汉字状Fe相。

Abstract

Effects of different Mn content on iron phase morphology were investigated by optical microscopy（OM）

X-ray diffraction（XRD）

scanning electron microscopy（SEM）

energy dispersive spectrum（EDS）

and the phase diagram analysis was carried out by the Thermal-calc software.The results show that a new compound is generated with Mn and Fe during the crystallization and solidification

which makes the needle shaped β-Al5 FeSi phase transform into particle shaped or Chinese scriptα-Al（Mn

Fe） Si phase.A356 alloy crystal phase during solidification consists ofα-Al

α-Al（Mn

Fe）Si

β-Al5FeSi and Mg2Si.Phase diagram analysis reveals that with the increase of Mn content

the precipitation temperature ofα-Al（Mn

Fe）Si is raised

which is beneficial for the growth ofα-Al（Mn

Fe）Si phase to form the dendritic or Chinese script Fe phase.