Abstract
Transmission electron microscopy observations during in situ tensile tests revealed α″ phase transformation in a β phase Ti-24Nb-4Zr-7.9Sn (wt%) alloy. Single variant α″ phase is formed in deformation bands under tensile stress and the deformation bands vanish after the applied stress is released. With increasing strain, two variants of the α″ phase are observed in deformation bands along different directions, respectively. When these deformation bands intersected with each other, these two variant α″ phases could remain after unloading of the external stress. The α″ phase transformation in single variant deformation bands likely contributes to the nonlinear pseudo-elasticity of this alloy.
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