Nanodomain structure and its effect on abnormal thermal expansion behavior of a Ti-23Nb-2Zr-0.7Ta-1.2O alloy

被引：100
作者：
Kim, Hee Young [1 ]
Wei, Lesi [1 ]
Kobayashi, Shuhei [1 ]
Tahara, Masaki [2 ]
Miyazaki, Shuichi [1 ,3 ,4 ,5 ]
机构：
[1] Univ Tsukuba, Div Mat Sci, Tsukuba, Ibaraki 3058573, Japan
[2] Tokyo Inst Technol, Precis & Intelligence Lab, Yokohama, Kanagawa 2268503, Japan
[3] King Abdulaziz Univ, Ctr Excellence Adv Mat Res, Jeddah 21589, Saudi Arabia
[4] Gyeongsang Natl Univ, Sch Mat Sci & Engn, Jinju 660701, Gyeongnam, South Korea
[5] Gyeongsang Natl Univ, ERI, Jinju 660701, Gyeongnam, South Korea
来源：
ACTA MATERIALIA | 2013年 / 61卷 / 13期
基金：
新加坡国家研究基金会;
关键词：
Titanium alloys; Martensitic transformation; Thermal expansion; Nanodomains; Lattice modulation; ZR-O ALLOYS; TRANSMISSION ELECTRON-MICROSCOPY; SHAPE-MEMORY ALLOYS; DEFORMED GUM METAL; TI-NB ALLOYS; DEFORMATION-BEHAVIOR; PLASTIC-DEFORMATION; MARTENSITIC-TRANSFORMATION; ALPHA''-MARTENSITE; LATTICE MODULATION;
D O I：
10.1016/j.actamat.2013.04.060
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure and thermal expansion behavior of a Ti-23Nb-2Zr-0.7Ta-1.2O alloy (Gum metal) were investigated. A systematic diffraction pattern analysis using transmission electron microscopy revealed that a {1 (1) over bar0}< 110 >-type transverse lattice modulation is present in the Ti-23Nb-2Zr-0.7Ta-1.2O alloy. Martensite-like nanodomains corresponding to {1 (1) over bar0}< 110 >-type lattice modulations were observed in dark-field micrographs. Six variants of lattice modulation were confirmed to be distributed equivalently in the beta phase in the annealed condition. Cold rolling resulted in preferential growth of a nanodomain variant which is most suited to releasing the applied stress although the long-range martensitic transformation was prevented by the local stress of the domain structure caused by oxygen atoms. It is suggested that the very small thermal expansion coefficient in the as-rolled specimen is caused by the preferential growth of the nanodomain variant due to residual stress. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：4874 / 4886
页数：13
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