Effect of Sc Addition on Microstructures and Properties of the Squeeze Cast Al-Zn-Mg-Cu-Zr Alloy

He Min; Li Bao; Gao Zhihua; Xu Jun

doi:10.15980/j.tzzz.2016.06.011

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Effect of Sc Addition on Microstructures and Properties of the Squeeze Cast Al-Zn-Mg-Cu-Zr Alloy
Vol. 36, Issue 6, Pages: 597-600(2016)
Published： 2016 ，
DOI： 10.15980/j.tzzz.2016.06.011

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[1]何敏,李豹,高志华,徐骏.Sc对Al-Zn-Mg-Cu-Zr合金挤压铸造组织性能的影响[J].特种铸造及有色合金,2016,36(06):597-600.

He Min, Li Bao, Gao Zhihua, et al. Effect of Sc Addition on Microstructures and Properties of the Squeeze Cast Al-Zn-Mg-Cu-Zr Alloy. [J]. Special Casting & Nonferrous Alloys 36(6):597-600(2016)
[1]何敏,李豹,高志华,徐骏.Sc对Al-Zn-Mg-Cu-Zr合金挤压铸造组织性能的影响[J].特种铸造及有色合金,2016,36(06):597-600. DOI： 10.15980/j.tzzz.2016.06.011.

He Min, Li Bao, Gao Zhihua, et al. Effect of Sc Addition on Microstructures and Properties of the Squeeze Cast Al-Zn-Mg-Cu-Zr Alloy. [J]. Special Casting & Nonferrous Alloys 36(6):597-600(2016) DOI： 10.15980/j.tzzz.2016.06.011.

摘要

采用电阻炉熔炼了Al-7.2Zn-2.2Mg-1.8Cu-0.2Zr和Al-7.2Zn-2.2Mg-1.8Cu-0.2Sc-0.2Zr两种铝合金

在700

20℃挤压铸造成形

并经过465℃×24h+475℃×8h水淬+120℃×24h时效热处理。结果表明

Sc、Zr的复合添加能明显细化α-Al基体和晶间第二相;通过多级固溶和时效处理

显著提高了合金的力学性能

铸件的抗拉强度达到613MPa

屈服强度达到528 MPa

伸长率为6%。

Abstract

Al-7.2Zn-2.2Mg-1.8Cu-0.2Zr alloy and Al-7.2Zn-2.2Mg-1.8Cu-0.2Sc-0.2Zr alloy were prepared by resistance furnace.The two alloy samples were produced by squeeze casting at 700

20 ℃

which was treated at 465 ℃×24+475 ℃×8hsolid solution

water quenching +120 ℃×24haging.The results show that through the addition of trace element Sc and Zr

theα-Al phase and the second phase intercrystalline in the Al-Zn-Mg-Cu alloys are refined effectively.Through the multi-stage solid solution and aging treatment

the mechanical properties of alloy are improved significantly

where the tensile strength

yield strength and elongation of the samples reach up to 613 MPa

528 MPa

respectively.