Abstract
In addition to shape memory effect and superelasticity, metastable β-type Ti alloys exhibit various unique properties such as low Young's modulus and {332} deformation twinning. Furthermore, some metastable β-type Ti alloys, so-called gum metals, exhibit multifunctional properties such as excellent cold workability, low elastic modulus, high strength, and Invar-like behavior. In this chapter, the unique properties, which are associated with the phase stability and martensitic transformation, of the metastable β-type Ti alloys are overviewed. The mechanisms of these unique properties in metastable β-type Ti alloys are discussed with particular emphasis on the role of the martensitic transformation.
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