Optimization of the pre-aging treatment for an AA6022 alloy at various temperatures and holding times

被引：56
作者：
Ding, Lipeng [1 ]
He, Yang [1 ]
Wen, Zhang [1 ]
Zhao, Pizhi [2 ,3 ]
Jia, Zhihong [1 ]
Liu, Qing [1 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
[2] Suzhou Res Inst Nonferrous Met, Dept Fabricat Proc & Technol Aluminum Alloys, Suzhou 215026, Peoples R China
[3] CHINALCO Res Inst Sci & Technol, Dept Fabricat Proc & Technol Aluminum Alloys, Beijing 100082, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 647卷
基金：
对外科技合作项目（国际科技项目）; 中国国家自然科学基金;
关键词：
AA6022; alloy; Pre-aging; Natural aging; Bake hardening response; MG-SI ALLOYS; ELECTRON-MICROSCOPY; ATOM-PROBE; CU ALLOY; PRECIPITATION; BEHAVIOR; SHEET; SEQUENCE; KINETICS; AA6111;
D O I：
10.1016/j.jallcom.2015.05.188
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of pre-aging at four different temperatures and three holding times on the natural aging and the bake hardening response of an AA6022 alloys were studied by Vickers microhardness measurement, tensile test, differential scanning calorimetry (DSC) analysis and transmission electron microscopy (TEM). It was revealed that pre-aging immediately after quenching is effective in suppressing the natural aging and improving the bake hardening response (BHR), which is attributed to the readily formation of Cluster(2) during pre-aging treatment as well as depressing of Cluster(1). The optimum pre-aging treatments were exploited as: 80 degrees C for 8 h; 100 degrees C for 3 h; 130 degrees C for 20 min and 170 degrees C for 5 min. By considering the practical process requirement pre-aging at 100 degrees C for 3 h gives a better BHR without impairing the formability in T4P temper, which has the potential to be used in industrial production. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：238 / 244
页数：7
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