Abstract
The microstructure and deformation behavior of Ti-23Nb-2Zr-0.7Ta-(0.3–1.8)O (at.%) alloys were investigated in order to elucidate deformation mechanism of Gum metal in relation to the martensitic transformation. The long range stress induced martensitic transformation was suppressed with increasing oxygen concentration, resulting in a higher apparent yield stress and narrower stress hysteresis. The increase in the oxygen concentration facilitated the formation of nano-domain structures and suppressed the formation of athermal ω phase. The unique temperature dependence of the deformation behavior was discussed on the basis of the stability of β phase and athermal ω phase.
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