Change in the deformation mode resulting from beta-omega compositional partitioning in a Ti-Mo alloy: Room versus elevated temperature

The effect of beta-omega compositional partitioning, introduced via isothermal annealing, on the deformation behavior of a Ti-Mo alloy was investigated via tensile testing at room and elevated temperatures. While beta with compositionally congruent athermal omega precipitates primarily exhibits twinning, after beta-omega compositional partitioning the same alloy deforms via slip. This change in deformation mode can be rationalized based on the solute content within the beta matrix, with reference to the Bo-Md plot. Tensile testing at elevated temperatures revealed that both conditions, deformed via slip while exhibiting serrated flow. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.