The influence of Cu addition and pre-straining on the natural aging and bake hardening response of Al-Mg-Si alloys

被引：71
作者：
Ding, Lipeng [1 ]
Jia, Zhihong [1 ]
Liu, Yingying [1 ]
Weng, Yaoyao [1 ]
Liu, Qing [1 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 688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：
Al-Mg-Si alloys; Pre-straining; Cu addition; Precipitates; PRECIPITATION BEHAVIOR; DEFORMATION; KINETICS;
D O I：
10.1016/j.jallcom.2016.07.066
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-straining on the natural aging and bake hardening of Al-Mg-Si alloys with different additions of Cu were investigated by Vickers microhardness measurements, differential scanning calorimetry (DSC) analysis and transmission electron microscopy (TEM) characterization. It is revealed that introducing pre-straining can suppress the natural aging and increase the bake hardening response (BHR) for both low and high Cu addition alloys. A pre-strain of 2% is found to be the optimum process. Addition of Cu can increase the effect of pre-straining in suppressing the natural aging and improving the BHR after paint baking. The slow diffusion rate of Cu atoms in the Al matrix is most probably the main reason for the significant suppression of natural aging in the high content Cu alloy after pre-straining. During paint baking, the dislocations introduced promote the preferential precipitation of the Q ' phase and produce a disordered structure within the precipitates. Thus designing new pre-straining processes should fully consider the influences of Cu addition to the alloys. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：362 / 367
页数：6
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