Influence of Sn on martensitic beta Ti alloys

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 firstly found that Sn stabilizes β-phase and effectively suppresses the formation of ω-phase. Along with β-phase stability, we observe lowering of the austenite and ma...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-01, Vol.743 (C), p.764-772
Main Authors: Cai, S., Wang, L., Schaffer, J.E., Gao, J., Ren, Y.
Format: Article
Language:English
Subjects:
Alloy systems
Beta phase
Deformation mechanisms
Detwinning
Dislocations
Martensite
Martensitic Ti
Martensitic transformations
MATERIALS SCIENCE
Modulus of elasticity
Phase stability
Phase transformation
Synchrotron
Synchrotron radiation
Texture
Titanium base alloys
Transformation temperature
X-ray diffraction
Zirconium
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Summary: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 firstly found that Sn stabilizes β-phase and effectively suppresses the formation of ω-phase. Along with β-phase stability, we observe 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. Finally, 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.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2018.11.095