Influence of pre-stretching on quench sensitive effect of high-strength Al-Zn-Mg-Cu-Zr alloy sheet

被引：22

作者：

He Ke-zhun ^{[1
,2
,3
]}

Li Qun ^{[4
]}

Liu Sheng-dan ^{[4
]}

Zhang Xin-ming ^{[4
]}

Zhou Ke-chao ^{[1
]}

机构：

[1] Cent South Univ, Powder Met Res Inst, Changsha 410083, Peoples R China

[2] Guangxi Alnan Inst Aerosp Transit Aluminum Alloy, Nanning 530031, Peoples R China

[3] Guangxi Alnan Aluminium Inc, Nanning 530031, Peoples R China

[4] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China

来源：

JOURNAL OF CENTRAL SOUTH UNIVERSITY | 2021年 / 28卷 / 09期

关键词：

high-strength aluminum alloy; pre-stretching; tensile properties; quench sensitive effect; strengthening precipitates; STRESS-CORROSION CRACKING; MICROSTRUCTURE EVOLUTION; DECOMPOSITION PROCESSES; PRECIPITATION BEHAVIOR; GRAIN-STRUCTURE; ALUMINUM-ALLOY; ETA' PHASE; STRAIN; INHOMOGENEITY; PREDEFORMATION;

D O I：

10.1007/s11771-021-4800-0

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The influence of pre-stretching on quench sensitive effect of high strength Al-Zn-Mg-Cu-Zr alloy AA 7085 sheet was investigated by tensile testing at room temperature, transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). The water-cooled and aged alloy exhibits higher strength than the air-cooled and aged alloy; 2.5% pre-stretching of tensile deformation exerts little effect on strength of water-cooled and aged alloy but increases that of air-cooled and aged one, and therefore the yield strength reduction rate due to slow quenching decreases from about 3.8 % to about 1.0 %, reducing quench sensitive effect. For the air-cooled alloy, pre-stretching increases the sizes of eta ' strengthening precipitates but also increases their quantity and the ratio of diameter to thickness, resulting in enhanced strengthening and higher strength after aging. The reason has been discussed based on microstructure examination by TEM and DSC.

引用

页码：2660 / 2669

页数：10

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