Age-hardening behavior of a single-crystal Cu-ti alloy

被引：25
作者：
Semboshi, S. [1 ,2 ]
Hinamoto, E. [2 ]
Iwase, A. [2 ]
机构：
[1] Tohoku Univ, Kansai Ctr, Inst Mat Res, Naka Ku, Sakai, Osaka 5998531, Japan
[2] Osaka Prefecture Univ, Dept Mat Sci, Naka Ku, Sakai, Osaka 5998531, Japan
来源：
MATERIALS LETTERS | 2014年 / 131卷
基金：
日本学术振兴会;
关键词：
Copper-titanium alloy; Single-crystal; Age-hardening; Microstructure; Precipitation; COPPER-TITANIUM ALLOYS; PRECIPITATION;
D O I：
10.1016/j.matlet.2014.05.128
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure and hardness of a single-crystal Cu-4 mol% Ti alloy aged at 723 K are studied, and compared with those for conventional poly-crystal specimens. Only the metastable beta'-Cu4Ti precipitates are dispersed finely and grown continuously in grains without discontinuous transformation into the stable beta-Cu4Ti laminates as found in poly-crystal specimens, because of lack of grain boundaries. Hardness increases with aging and reaches a maximum at approximately 12 h, which is attributed to the fine dispersion of beta'-Cu4Ti. On further aging, hardness decreases more gradually in single-crystal specimens than in poly-crystal specimens. The gradual decrease in hardness for single-crystal specimens is due to the gradual growth of beta'-Cu4Ti. Conversely, the rapid decrease in the hardness of poly-crystal specimens is due to the discontinuous formation of coarse beta-Cu4Ti , that accompanies the consumption of fine beta'-Cu4Ti precipitates. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：90 / 93
页数：4
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