Deformation-induced omega-phase transformation in a beta-type titanium alloy during tensile deformation

摘要

Deformation-induced co-phase transformation during tensile deformation was investigated in the developed spinal-support alloy, Ti-9Cr-0.2O. Both preferential single-variant omega transformation along its [0001] direction and growth and/or assembling of uniformly distributed omega particles undergo in the alloy during tensile deformation. It is confirmed that this deformation-induced omega-phase transformation can be triggered by elastic strain or stress without plastic deformation. Furthermore, a re-orientation process works for this transformation; that is, the omega(1) variant may re-orientate into the omega(2) variant via {001} (110) twinning-type mechanism probably related to the external loading condition and the orientations of omega and beta phases. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.