Combined effect of pre-straining and pre-aging on bake-hardening behavior of an Al-0.6 mass % Mg-1.0 mass % Si alloy

被引：0
作者：
Masuda T. [1 ,2 ]
Takaki Y. [2 ]
Sakurai T. [2 ,4 ]
Hirosawa S. [3 ]
机构：
[1] Yokohama National University, Yokohama-shi, Kanagawa
[2] Aluminum Sheets and Coils Research Department, Kobe Steel, Ltd., Moka-shi, Tochigi
[3] Department of Mechanical Engineering and Materials Science, Yokohama National University, Yokohama-shi, Kanagawa
[4] Technology Control Department, Technical Planning and Administration Section, Kobe Steel, Ltd., Shinagawa-ku, Tokyo
来源：
Keikinzoku/Journal of Japan Institute of Light Metals | 2010年 / 60卷 / 04期
关键词：
Al-Mg-Si alloy; Bake-hardening; Clusters; Dislocations; Pre-aging; Pre-straining; Two-step aging; Vacancy concentration;
D O I：
10.2464/jilm.60.183
中图分类号：
学科分类号：
摘要：
The effect of pre-straining in combination with pre-aging on bake-hardening behavior of an Al-0.6mass%Mg-1.0 mass%Si alloy was investigated by means of Vickers hardness test, electrical conductivity measurement, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Hardness change and DSC analysis revealed that only 3% pre-strain suppresses the formation of clusters; Le. cluster (1), during single aging below 343 K. On the other hand, by combining with pre-aging at 343 K, pre-straining was found to improve bake-hardening response during final aging at 443 K. TEM observation confirmed that the improvement of bake-hardening response by pre-straining is mainly due to the enhanced precipitation of β″ phase in the matrix. These results are explained by the consideration that dislocations induced by pre-straining reduce the concentration of quenched-in excess vacancies, resulting in both the suppressed clustering of solute atoms during pre-aging and the accelerated precipitation of the β″ phase from more supersaturated solute atoms in final aging.
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页码：183 / 189
页数：6
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