Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1575192 | Materials Science and Engineering: A | 2014 | 7 Pages |
Abstract
A fine and uniform distribution of α phase at grain boundaries is expected to improve the mechanical properties and thermal stability of beta Ti alloys. To design high strength alloys, a key factor is the volume fraction of α, which is related to the concentration of the α phase. In this study, α-phase precipitates were characterized in an ultrafine-grained Ti-15Nb-2Mo-2Zr-1Sn (at%) alloy processed by severe plastic deformation in two different ways (hot drawing and cold rolling in conjunction with annealing). A combination of transmission Kikuchi diffraction, transmission electron microscopy and atom-probe tomography revealed that ultra-fine α precipitates precipitate at grain boundaries in hot-drawn material or at sub-grain boundaries in the cold-rolled samples. The Nb concentrations of α phases formed were not those expected for an equilibrium state, which highlights the importance of understanding the chemistry of the α precipitates for engineering microstructures in advanced Ti alloys.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Tong Li, Damon Kent, Gang Sha, Matthew S. Dargusch, Julie M. Cairney,