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Phase Transformations in the Oxygen-Enriched Case Layer of Beta Titanium Alloys Formed During Oxidation (Preprint)
Technical paper 1 Jul-1 Aug 2012
UNIVERSITY OF NORTH TEXAS DENTON
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The formation of an oxide layer along together with alpha precipitation in the subsurface oxygenenriched zone, during the oxidation of a Beta-Ti alloy, has been investigated using SEM, STEM, and nanoindentation. Just below the nanocrystalline oxide layer, a two-phase mixture consisting of nanoscale equiaxed alpha grains and rutile grains is formed. Further below, the morphology of the alpha precipitates transitions to more lath-like with their size-scale, nucleation density, and the volume fraction of Beta progressively changing with increasing depth.
APPROVED FOR PUBLIC RELEASE