Si元素对挤压铸造Al-5Mg-xSi合金微观组织的影响

孙浩然; 赵海东; 代航; 邓德杰

doi:10.15980/j.tzzz.2019.03.008

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Si元素对挤压铸造Al-5Mg-xSi合金微观组织的影响
Effects of Si Contents on Microstructure of Squeezing Cast Al-5Mg-xSi Alloys
2019年39卷第3期页码：266-270
纸质出版日期： 2019 ，
DOI： 10.15980/j.tzzz.2019.03.008

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[1]孙浩然,赵海东,代航,邓德杰.Si元素对挤压铸造Al-5Mg-xSi合金微观组织的影响[J].特种铸造及有色合金,2019,39(03):266-270.

Sun Haoran, Zhao Haidong, Dai Hang, et al. Effects of Si Contents on Microstructure of Squeezing Cast Al-5Mg-xSi Alloys[J]. Special Casting & Nonferrous Alloys, 2019,39(3):266-270.
[1]孙浩然,赵海东,代航,邓德杰.Si元素对挤压铸造Al-5Mg-xSi合金微观组织的影响[J].特种铸造及有色合金,2019,39(03):266-270. DOI： 10.15980/j.tzzz.2019.03.008.

Sun Haoran, Zhao Haidong, Dai Hang, et al. Effects of Si Contents on Microstructure of Squeezing Cast Al-5Mg-xSi Alloys[J]. Special Casting & Nonferrous Alloys, 2019,39(3):266-270. DOI： 10.15980/j.tzzz.2019.03.008.

摘要

使用Thermo-Calc软件模拟了不同Si含量的Al-5Mg-xSi合金组织

对具有不同组织特征的合金进行挤压铸造。结果表明

不含Si时

合金的组织为α-Al+少量β-Al

相;加入Si后

组织中开始出现α+Mg

Si共晶

且随着Si含量增加

共晶组织含量逐渐增多

共晶形貌由细长条状转变为粗大的凹多边形块状。当Si含量为0.1%～1.4%时

合金的组织为α、α+Mg

Si共晶、少量β相;当Si含量为1.5%～2.3%时

合金的组织为α、α+Mg

Si共晶;Si含量继续增加时

合金组织中出现细长的Si晶粒。

Abstract

Thermo-Calc was used to predict the microstructure of alloys with different Si contents

and the alloys with different microstructure characteristics were prepared by squeezing casting method.The results show that the microstructure of the alloy is composed ofα-Al matrix and a small amount ofβ-Al

phase without Si.After the addition of Si

α-Al+Mg

Si eutectic phase appears.With the increase of Si contents

the contents of eutectic phase is gradually increased and its morphology is transferred from slender bars into massive concave polygon.With the Si contents of 0.1%～1.4%

the microstructure is composed of Al matrix

α+Mg

Si eutectic and a small amount of Al

phase.With the Si contents of 1.5%～2.3%

the microstructure consists of Al matrix andα+Mg

Si eutectic.When the Si contents are further increased

the fibrous Si particles appear in the morphology.