Grain size and reversible beta-to-omega phase transformation in a Ti alloy

We report a significant grain size effect on the phase transformation in a Ti–36Nb–2.2Ta–3.7Zr–0.3O alloy during severe plastic deformation. For grain sizes larger than the submicrometer range, the body-centered cubic β phase transformed to hexagonal ω phase when deformed by high-pressure torsion un...

Full description

Saved in:
Bibliographic Details
Published in:Scripta materialia 2010-09, Vol.63 (6), p.613-616
Main Authors: Wang, Y.B., Zhao, Y.H., Lian, Q., Liao, X.Z., Valiev, R.Z., Ringer, S.P., Zhu, Y.T., Lavernia, E.J.
Format: Article
Language:English
Subjects:
Nanocrystalline
Phase transformation
Severe plastic deformation
Titanium alloy
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report a significant grain size effect on the phase transformation in a Ti–36Nb–2.2Ta–3.7Zr–0.3O alloy during severe plastic deformation. For grain sizes larger than the submicrometer range, the body-centered cubic β phase transformed to hexagonal ω phase when deformed by high-pressure torsion under a relatively low pressure of 3 GPa and at room temperature. However, a reverse ω to β transformation was observed under the same deformation conditions when the grain sizes were less than 100 nm.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2010.05.045