Effect of Al Addition on Superelastic Properties of Aged Ti–Nb–Zr–Al Quaternary Alloys

Abstract

The effect of Al content on superelastic properties of Ti_75−xNb₁₅Zr₁₀Al_x (x = 0–6 at%) quaternary β Ti alloys were investigated. And the effects of baking for coating or plating on superelastic properties were also studied. The alloys containing 3 and 4 at% of Al clearly exhibited superelastic behavior after aging at 453 and 553 K, which are appropriate temperatures for industrial coating and plating, respectively. Ti₇₂Nb₁₅Zr₁₀Al₃ alloy exhibited the largest recovery strain of 2.5% due to superelastic behavior even after industrial coating and plating. In this quaternary alloy system, strange non-monotonical change of superelastic behavior as a function of Al content was also found.