Influence of prior deformation on the age hardening of a phosphorus-containing Cu-0.61wt.%Cr alloy

被引:42
作者
Gao, N
Huttunen-Saarivirta, E
Tiainen, T
Hemmilä, M
机构
[1] Tampere Univ Technol, Inst Mat Sci, FIN-33101 Tampere, Finland
[2] Rautaruukki Steel, Strip Prod, Raahe 92101, Finland
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2003年 / 342卷 / 1-2期
关键词
copper-chromium alloy; cold deformation; hardness; precipitation; recrystallization;
D O I
10.1016/S0921-5093(02)00306-4
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A copper alloy containing 0.61 wt.% Cr and 0.07 wt.% P was solution annealed and cold deformed to true strains ranging from 0.1 to 0.9. After being aged at 510 degreesC for different times, the deformed alloy was characterized using the measurement of Vickers hardness, optical microscopy and transmission electron microscopy. During the isothermal aging, the hardness of the deformed alloy showed three distinct stages as a function of aging time; this hardness behavior was associated with the interactions between precipitation, recovery and recrystallization. The amount of prior deformation and aging time influenced the interactions of the three processes. On aging, the lightly deformed alloy exhibited a retarded recrystallization process and therefore an efficient hardening response. The heavily deformed alloy ( > 0.7 strain) showed an accelerated process of recrystallization so that a long time aging (e.g. 60 min) resulted in an inefficient precipitation hardening due to the increased softening with the progress of recrystallization. The results of this study suggest that the precipitation process should occur before the onset of recrystallization during the aging of a deformed supersaturated alloy in order to result in an efficient hardening. This condition can be achieved by controlling the amount of prior deformation, aging temperature and time. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:270 / 278
页数:9
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