Microstructures Evolution and Mechanical Properties of Squeeze Cast Al-5.0Cu-0.8Mg-0.5Fe Alloys

Ren Lirong; Lin Bo

doi:10.15980/j.tzzz.2016.08.010

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Microstructures Evolution and Mechanical Properties of Squeeze Cast Al-5.0Cu-0.8Mg-0.5Fe Alloys
Vol. 36, Issue 8, Pages: 818-821(2016)
Published： 2016 ，
DOI： 10.15980/j.tzzz.2016.08.010

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[1]任丽蓉,林波.挤压铸造Al-5.0Cu-0.8Mg-0.5Fe合金的组织及性能[J].特种铸造及有色合金,2016,36(08):818-821.

Ren Lirong, Lin Bo. Microstructures Evolution and Mechanical Properties of Squeeze Cast Al-5.0Cu-0.8Mg-0.5Fe Alloys. [J]. Special Casting & Nonferrous Alloys 36(8):818-821(2016)
[1]任丽蓉,林波.挤压铸造Al-5.0Cu-0.8Mg-0.5Fe合金的组织及性能[J].特种铸造及有色合金,2016,36(08):818-821. DOI： 10.15980/j.tzzz.2016.08.010.

Ren Lirong, Lin Bo. Microstructures Evolution and Mechanical Properties of Squeeze Cast Al-5.0Cu-0.8Mg-0.5Fe Alloys. [J]. Special Casting & Nonferrous Alloys 36(8):818-821(2016) DOI： 10.15980/j.tzzz.2016.08.010.

摘要

采用金相组织观察、扫描电镜、拉伸性能测试等手段

研究了挤压铸造Al-5.0Cu-0.8Mg-0.5Fe合金的组织演变和力学性能。结果表明

当挤压压力从0增大到75 MPa时

合金的力学性能得到显著提高

这主要是由于挤压压力有利于Al-Cu合金中汉字状AlmFe相的形成

抑制针状β-Fe相的形成

同时显著细化富Fe相

减少铸造缺陷。当挤压压力为75MPa时

铸态下合金抗拉强度为258 MPa

伸长率为8.5%

经T6热处理后

其抗拉强度为432 MPa

伸长率为6.7%。

Abstract

The microstructures evolution and mechanical properties of squeeze cast Al-5.0Cu-0.8Mg-0.5Fe alloys were investigated by metallographic microstructure observation

scanning electron microscopy

tensile testing.The results reveal that the tensile properties of Al-Cu alloy containing high Fe content are improved greatly with the applied pressure increasing from 0to 75 MPa

which are attributed to the applied pressure promoting the formation of Chinese script AlmFe and preventing the precipitation of needle-likeβ-Fe

refining Fe-rich intermetallics as well as decreasing cast defects.With the applied pressure of 75 MPa

the tensile strength and elongation of the alloy reach 258 MPa and 8.5%in as-cast condition

while they reach 432 MPa and 6.7% after T6 heat treatment

respectively.