Mn对Mg-3.2Si合金组织和力学性能的影响

刘栩瑞; 金帆; 占维; 张磊

doi:10.15980/j.tzzz.2018.08.027

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Mn对Mg-3.2Si合金组织和力学性能的影响
Effects of Mn on Microstructure and Mecahnical Properties of Mg-3.2Si Alloy
2018年38卷第8期页码：913-915
纸质出版日期： 2018 ，
DOI： 10.15980/j.tzzz.2018.08.027

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[1]刘栩瑞,金帆,占维,张磊.Mn对Mg-3.2Si合金组织和力学性能的影响[J].特种铸造及有色合金,2018,38(08):913-915.

Liu Xurui, Jin Fan, Zhou Wei, et al. Effects of Mn on Microstructure and Mecahnical Properties of Mg-3.2Si Alloy[J]. Special Casting & Nonferrous Alloys, 2018,38(8):913-915.
[1]刘栩瑞,金帆,占维,张磊.Mn对Mg-3.2Si合金组织和力学性能的影响[J].特种铸造及有色合金,2018,38(08):913-915. DOI： 10.15980/j.tzzz.2018.08.027.

Liu Xurui, Jin Fan, Zhou Wei, et al. Effects of Mn on Microstructure and Mecahnical Properties of Mg-3.2Si Alloy[J]. Special Casting & Nonferrous Alloys, 2018,38(8):913-915. DOI： 10.15980/j.tzzz.2018.08.027.

摘要

采用Mn对过共晶Mg-3.2Si合金进行变质处理

主要考察了Mn含量对合金中初生Mg2Si相的变质效果及合金力学性能的影响。结果表明

Mn对过共晶Mg-3.2Si合金中的初生Mg2Si相具有良好的变质效果。当Mn含量为2%（质量分数）时

变质效果最佳

此时初生Mg2Si相呈多边形

平均颗粒尺寸仅为32μm

相比未变质合金降低了56.8%。随着Mn含量的增加

合金的力学性能呈先提高后降低的趋势。当Mn含量为2%时

合金表现出最佳的力学性能

其抗拉强度和伸长率分别达到187 MPa和3.2%

相比未变质合金提高了67.0%和166.7%。

Abstract

The hypereutectic Mg-3.2 Si alloy was modified by Mn.Effects of Mn addition on the modification of primary Mg2 Si and mechanical properties of Mg-3.2 Si alloy were investigated.Experimental results show that the primary Mg2 Si can be modified effectively.With 2% Mn addition

the morphology of primary Mg2 Si is changed from equiaxed dendritic to polyhedral.The average particle size of primary Mg2 Si reaches 32μm

decreased by 56.8%

compared with those of the unmodified alloy.The tensile strength and elongation of the modified alloys are increased with Mn addition increase.With 2% Mn addition

the tensile strength and elongation of the Mg-3.2 Si alloy reach 167 MPa and 3.2%

increased by49.1% and by 166.7%

respectively

compared with those of the unmodified alloy.