Influence of Sn on Martensitic Beta Ti Alloys

Journal Article · Wed Nov 21 23:00:00 EST 2018 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2018.11.095· OSTI ID:1503591

Cai, Song ^[1]; Wang, L. ^[2]; Schaffer, J. E. ^[1]; Gao, J. ^[3]; Ren, Y. ^[4]

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1. Fort Wayne Metals Research Products Corp., Fort Wayne, IN (United States)
2. Beijing Inst. of Technology, Beijing (China)
3. Northeastern Univ., Shengyang (China). Key Lab. of Electromagnetic Processing of Materials (Ministry of Education)
4. Argonne National Laboratory (ANL), Lemont, IL (United States)

The influence of Sn composition in Ti-17 at.% Nb alloys is studied by cyclic tension and in-situ synchrotron X-ray diffraction. It is essentially found that Sn stabilizes β-phase and effectively suppresses the formation of ω-phase. Along with β-phase stability, we detect lowering of the austenite and martensite transformation temperature by ~ 100 K/at.% and 88 K/at.%, respectively. Increasing Sn decreases the martensitic transformation strain in Ti-Nb alloys by ~ 1.4%/at.%, larger than that in Ti-Zr-Nb-Sn systems. The influence of Sn in martensitic Ti is anisotropic: causing larger reduction in lattice parameter b and higher decreases in elastic moduli of grain families that are aligned close to the b-axis. Lastly, a {013}_α'', {031}_α'',{122}_α'' and {211}_α'' quadruple texture was observed in martensitic Ti wire. At the early stage of deformation, detwinning quickly rotated {013}_α'' and (211}_α'', towards {031}_α'' and {122}_α'' components. After that, the strength of {031}_α'' continued to increase, while the strength of {122}_α'' texture was gradually decreased by dislocation slip as deformation continued.

• Research Organization: Argonne National Laboratory (ANL), Lemont, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1503591
• Alternate ID(s): OSTI ID: 1636633
• Journal Information: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Journal Name: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing Journal Issue: C Vol. 743; ISSN 0921-5093
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
detwinning
martensitic Ti
phase transformation
synchrotron
texture