Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1580572 | Materials Science and Engineering: A | 2010 | 7 Pages |
Abstract
A laser deposited near-alpha titanium alloy Ti-4Al-1.5Mn was annealed in the α + β phase region at different temperatures in an attempt to obtain novel microstructure. Notch impact toughness of the annealed alloy was evaluated as a function of anneal temperature. Anneal microstructure and fracture surfaces of impact test specimens were characterized by OM and SEM. A unique bi-modal microstructure consisting of coarse crab-claw-like primary α and fine lamellar transformed β was generated by annealing the alloy in the α + β region. Area fraction of the crab-claw-like primary α decreased sharply with the increasing anneal temperature. The impact toughness of the as-deposited alloy was equivalent to that of wrought counterpart and was largely improved by annealing in α + β region. The unique bi-modal microstructure produced more interfaces which were obstacles for crack propagation, contributing to a higher impact toughness.
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Authors
X.J. Tian, S.Q. Zhang, A. Li, H.M. Wang,