An Investigation of Bi Modification of in Situ Mg2Si/Al Composite

Si Yi1; Wang Zhe2; Wu Xiaofeng2

doi:10.15980/j.tzzz.2012.09.009

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An Investigation of Bi Modification of in Situ Mg2Si/Al Composite
Vol. 32, Issue 9, Pages: 846-849(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.09.009

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[1]司颐,王喆,武晓峰.Bi变质原位自生Mg_2Si/Al复合材料的研究[J].特种铸造及有色合金,2012,32(09):846-849.

Si Yi1, Wang Zhe2, Wu Xiaofeng2. An Investigation of Bi Modification of in Situ Mg2Si/Al Composite. [J]. Special Casting & Nonferrous Alloys 32(9):846-849(2012)
[1]司颐,王喆,武晓峰.Bi变质原位自生Mg_2Si/Al复合材料的研究[J].特种铸造及有色合金,2012,32(09):846-849. DOI： 10.15980/j.tzzz.2012.09.009.

Si Yi1, Wang Zhe2, Wu Xiaofeng2. An Investigation of Bi Modification of in Situ Mg2Si/Al Composite. [J]. Special Casting & Nonferrous Alloys 32(9):846-849(2012) DOI： 10.15980/j.tzzz.2012.09.009.

摘要

采用纯Bi对原位自生Mg2Si/Al复合材料进行变质;采用金相显微镜等观察了变质前后材料的微观组织;测试了材料的拉伸性能;并对变质前后合金的断口形貌进行了分析。结果表明

在原位自生Mg2Si/Al复合材料中添加适量的金属Bi对初生Mg2Si和共晶Mg2Si能够同时起到良好的变质作用

初生Mg2Si的形貌由粗大的树枝状或多角形块状转变为细小的块状

尺寸由70μm减小到6μm

而共晶Mg2Si则由粗大的片状转变为细小的片状、纤维状或点状。经1.0%的Bi变质后

材料的拉伸性能得到大幅度提高

抗拉强度从175MPa提高到260MPa

提高了48.6%

伸长率从3.5%提高到7.0%。

Abstract

In situ Mg2Si/Al composites were modified with pure Bi.The microstructures before and after modification were observed by OM（optical microscope）

and tensile properties of the composites modified were measured

and the fracture morphologies were analyzed by SEM（scanning electron microscope） before and after modification.The results show that the addition of proper amount of Bi has significant modification effect on both primary and eutectic Mg2Si in the composites.The morphology of primary Mg2Si is changed from dendritic to polyhedral shape

and the grain size is refined from 70 μm to 6 μm

meanwhile

the eutectic Mg2Si is transformed from flake-like to very short fibrous or dot-like.The tensile strength of the alloy modified by 1.0% Bi is increased from 175 MPa to 260 MPa

and its elongation is increased from 3.5% to 7.0%.