Stress-induced martensitic transformation of metastable β-titanium alloy

초록

The constituent phases and associated deformed microstructure of the quenched Ti-xNb-(0.5-1.5) at.% Si alloy consisting of non-cytotoxicity elements, where x = 24-30 at.%, were investigated to provide pseudoelasticity for biomedical and sensor applications. Optical microscopy revealed that stress-induced martensitic transformation takes place during the deformation in the present alloys. It is confirmed from the X-ray diffraction results of the deformed specimens that the crystal structure of the stress-induced martensite phase is the orthorhombic so-called alpha" structure. Within the alloys having beta(bcc) phase studied Nb-poor region appeared to exhibit a dominant behavior for stress-induced martensitic transformation than Nb-rich region. This result suggests that metastable beta phase is superior to stable beta phase for the occurrence of stress-induced martensitic transformation in the present alloy system. (c) 2006 Elsevier B.V. All rights reserved.

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