Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5455579 | Materials Science and Engineering: A | 2017 | 20 Pages |
Abstract
A Ti-6Al-4V alloy was used to examine the effect of martensitic (αʹ) or lamellar (α + β) microstructures on grain refinement and the hcp to fcc phase transformation during HPT processing. There was significant grain refinement with grain sizes of ~ 30 and ~ 40 nm in the αʹ and α + β microstructures, respectively, and with the occurrence of an allotropic hcp to fcc phase transformation in the αʹ sample after HPT. A high volume fraction of boundaries, together with a substructure containing initial defects of the martensitic sample, promotes the formation of the fcc phase during the HPT processing.
Keywords
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Hamed Shahmir, Terence G. Langdon,