Effects of Cr on Microstructure and Mechanical Properties of High Vacuum Die Casting AlSi7MgMn

Zheng Lingbo; Zhao Haidong

doi:10.15980/j.tzzz.2021.03.021

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Effects of Cr on Microstructure and Mechanical Properties of High Vacuum Die Casting AlSi7MgMn
Vol. 41, Issue 3, Pages: 359-364(2021)
Published： 2021 ，
DOI： 10.15980/j.tzzz.2021.03.021

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[1]郑凌波,赵海东.Cr对高真空压铸AlSi7MgMn组织和力学性能的影响[J].特种铸造及有色合金,2021,41(03):359-364.

Zheng Lingbo, Zhao Haidong. Effects of Cr on Microstructure and Mechanical Properties of High Vacuum Die Casting AlSi7MgMn. [J]. Special Casting & Nonferrous Alloys 41(3):359-364(2021)
[1]郑凌波,赵海东.Cr对高真空压铸AlSi7MgMn组织和力学性能的影响[J].特种铸造及有色合金,2021,41(03):359-364. DOI： 10.15980/j.tzzz.2021.03.021.

Zheng Lingbo, Zhao Haidong. Effects of Cr on Microstructure and Mechanical Properties of High Vacuum Die Casting AlSi7MgMn. [J]. Special Casting & Nonferrous Alloys 41(3):359-364(2021) DOI： 10.15980/j.tzzz.2021.03.021.

摘要

采用高真空压铸制备了不同Cr含量的AlSiMgMnCr合金

通过扫描电镜（SEM）和透射电镜（TEM）对合金微观组织和析出相进行研究

统计了合金组织中的Fe相面积分数和等效圆直径。结果表明

随着Cr含量增加

T6态下合金的屈服强度提升

抗拉强度维持稳定

伸长率明显下降;另外

铝基体中铁相的面积分数和等效直径尺寸变大;加入Cr后合金形成含Cr的析出相

其抑制时效时β″相的生长

使β″相在铝基体中的均匀性下降。

Abstract

The AlSiMgMnCr alloy with different Cr contents was perpared by high vacuum die casting.The microstructure and precipitated phase of the alloy were investigated by SEM and TEM.The area fraction and equivalent diameter of iron phase in the alloy with different Cr content were calculated.The results reveal that with the increase of Cr content

the yield strength of the T6 state alloy is increased and the tensile strength keeps stable

while the elongation is decreased significantly.With the increase of Cr element

the area fraction and equivalent diameter of iron phase in aluminum matrix are increased.Cr element was added into the alloy to form the precipitated phase containing Cr

which inhibited the growth ofβ″phase in the aging stage

and the uniformity ofβ″phase in aluminum matrix was decreased.