期刊
ACTA MATERIALIA
卷 61, 期 13, 页码 4874-4886出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.04.060
关键词
Titanium alloys; Martensitic transformation; Thermal expansion; Nanodomains; Lattice modulation
资金
- JSPS KAKENHI [23360300, 25289247]
- MEXT KAKENHI [23102503]
- WCU (World Class University) Program from the National Research Foundation of Korea [R32-2008-000-20093-0]
- National Research Foundation of Korea [R32-2008-000-20093-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Grants-in-Aid for Scientific Research [23360300, 25102704, 23102503] Funding Source: KAKEN
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据