Effect of quenching rate on strengthening behavior of an Al-Zn-Mg-Cu alloy during natural ageing

被引：25
作者：
Liu, Shengdan [1 ,2 ]
Zhang, Menghan [1 ,2 ]
Li, Qun [1 ]
Zhu, Qianqian [3 ]
Song, Hui [4 ]
Wu, Xiaodong [3 ]
Cao, Lingfei [3 ,4 ]
Couper, Malcolm J. [5 ]
机构：
[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
[2] Minist Educ, Key Lab Nonferrous Met Sci & Engn, Changsha 410083, Peoples R China
[3] Chongqing Univ, Int Joint Lab Light Alloys, Minist Educ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
[4] Chongqing Univ, Electron Microscopy Ctr, Chongqing 400044, Peoples R China
[5] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 793卷
基金：
中国国家自然科学基金;
关键词：
Strengthening; Aluminum alloy 7085; Natural ageing; Precipitation; MECHANICAL-PROPERTIES; ALUMINUM-ALLOY; SENSITIVITY; MICROSTRUCTURE; PRECIPITATION; TEMPERATURE; AG;
D O I：
10.1016/j.msea.2020.139900
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of quenching rate on strengthening behavior of an Al-Zn-Mg-Cu alloy 7085 during natural ageing has been investigated by hardness, tensile testing, differential scanning calorimetry, transmission electron microscopy, high resolution transmission electron microscopy and three dimensional atom probe. Quench-induced Y phase forms in the air-cooled condition and contributes a remarkable 100 MPa to the as-quenched strength. The air-cooled condition continues to exhibit higher hardness and strength than for the rapid, water-cooled condition during natural ageing for up to about 30000 h. With the increase of natural ageing time, the hardness difference tends to decrease slowly within the first 0.5 h, then sharply until about 20 h, and finally approaches a constant, small difference. The reasons for this unusual quench sensitivity are discussed based on the different precipitation features arising during quenching and natural ageing.
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页数：9
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