Abstract
Shape memory and superelastic properties of Ti alloys are strongly influenced by the interstitial alloying elements such as oxygen and nitrogen, which are unavoidable impurities in Ti alloys. The interstitial alloying elements increase the critical stress for permanent deformation and improve superelastic properties. The interstitial alloying elements induce a nanosized lattice modulation (nanodomain) structure. The mechanism of superelasticity has been found to be dependent on the concentration of interstitial elements. In this chapter, the effects of interstitial alloying elements on the superelastic properties, martensitic transformation behavior, and deformation mechanism of metastable Ti alloys are overviewed.
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