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

被引：27
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.
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页码：90 / 93
页数：4
相关论文
共 12 条
[1]   ELECTRON-MICROSCOPY STUDY OF PRECIPITATION IN CU-TI SIDEBAND ALLOYS [J].
CORNIE, JA ;
DATTA, A ;
SOFFA, WA .
METALLURGICAL TRANSACTIONS, 1973, 4 (03) :727-733
[2]   STRUCTURE AND PROPERTIES OF AGE HARDENED CU-TI ALLOYS [J].
DATTA, A ;
SOFFA, WA .
ACTA METALLURGICA, 1976, 24 (11) :987-1001
[3]   THE CELLULAR REACTION IN DILUTE COPPER-TITANIUM ALLOYS [J].
ECOB, RC ;
BEE, JV ;
RALPH, B .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1980, 11 (08) :1407-1414
[4]   STRUCTURE OF THE BETA-PHASE IN DILUTE COPPER-TITANIUM ALLOYS [J].
ECOB, RC ;
BEE, JV ;
RALPH, B .
PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 1979, 52 (01) :201-210
[5]   PRECIPITATION OF TITANIUM IN COPPER AND COPPER-NICKEL BASE ALLOYS [J].
KNIGHTS, R ;
WILKES, P .
ACTA METALLURGICA, 1973, 21 (11) :1503-1514
[6]   SPINODAL DECOMPOSITION IN AGE HARDENING COPPER-TITANIUM ALLOYS [J].
LAUGHLIN, DE ;
CAHN, JW .
ACTA METALLURGICA, 1975, 23 (03) :329-339
[7]   The alloy content and grain size dependence of flow stress in Cu-Ti alloys [J].
Nagarjuna, S ;
Srinivas, M ;
Balasubramanian, K ;
Sarma, DS .
ACTA MATERIALIA, 1996, 44 (06) :2285-2293
[8]   ORDERING IN AN OFF-STOICHIOMETRIC NI-MO ALLOY [J].
NESBIT, LA ;
LAUGHLIN, DE .
ACTA METALLURGICA, 1978, 26 (05) :815-825
[9]  
Semboshi S, METALL MA A IN PRESS
[10]   Extraction of precipitates from age-hardenable Cu-Ti alloys [J].
Semboshi, Satoshi ;
Ishikuro, Mikio ;
Sato, Shigeo ;
Wagatsuma, Kazuaki ;
Takasugi, Takayuki .
MATERIALS CHARACTERIZATION, 2013, 82 :23-31
12