Abstract
Recently, among our developed Ti–Cr–3Sn alloys, the Ti–6Cr–3Sn alloy exhibited good mechanical, shape memory and pseudoelastic properties. However, the shape memory effect was incomplete, the pseudoelastic recovered strain was small and the ultimate tensile strength (UTS) was low. Therefore, in this study, the effect of a step heat treatment at 973K (SHT973K) in the (α+β) region with the purpose of creating a uniform distribution of the α phase in the β phase matrix using ω phase precursors was investigated. It was determined that the step heat treatment in the 973K (α+β) region was effective for improving the strength, shape memory and pseudoelastic properties of the Ti–6Cr–3Sn alloy due to the uniform distribution of the α phase in the β phase matrix, which resulted in a more effective increase in the critical stress for slip deformation. It is concluded that the uniform distribution of the α phase in the β matrix is an excellent method for improving the mechanical, shape memory and pseudoelastic properties of ω-sensitive β Ti alloys.
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