Impurities block the alpha to omega martensitic transformation in titanium

Abstract

The onset and kinetics of martensitic transformations are controlled by impurities trapped during the transformation. For the alpha to omega transformation in Ti, ab initio methods yield the changes in both the relative stability of and energy barrier between the phases. Using the recently discovered transformation pathway, we study interstitial O, N, C; substitutional Al and V; and Ti interstitials and vacancies. The resulting microscopic picture explains the observations, specifically the suppression of the transformation in A-70 and Ti-6Al-4V titanium alloys.

4 pages, 2 figures, 2 tables

References in corpus (2)

• A New Mechanism for the Alpha to Omega Martensitic Transformation in Pure Titanium
• Thermal Stabilization of the HCP Phase in Titanium

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