Journal
ACTA MATERIALIA
Volume 61, Issue 13, Pages 4874-4886Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.04.060
Keywords
Titanium alloys; Martensitic transformation; Thermal expansion; Nanodomains; Lattice modulation
Funding
- 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
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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.
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