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Mechanical Behavior and Martensitic Transformation of a Ti-Mo Based Shape Memory Alloy

Wednesday, November 9, 2011: 4:00 PM
Grand Ballroom C (Gold Coast Hotel )
Dr. Song Jie , School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
Dr. Xiaogang Sun , State Key Lab of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai, China
Xiaoning Zhang , School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
Prof. Xie Chaoying , School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
Dr. Ming H. Wu , Edwards Lifesciences, Irvine, CA
Abstract

A Ti-Mo based Ti-9.5Mo-4Nb-2V-3Al (wt. %) alloy exhibits shape memory effect and superelasticity with low elastic modulus (66 MPa). It is found that plate-like martensite α” can be stress-induced from the parent phase by tensile deformation, but it can not transform to parent phase reversely at room temperature after unloading. However, when the deformed specimen is heated to 500 K, the plate-like α” martensite can transform to parent phase, which is verified by X-ray diffraction (XRD) and DSC, and the strain is restored. The effect of aging on the superelasticity and shape memory effect of this Ti-Mo based alloy was investigated by cyclic tensile test. The Ti-9.5Mo-4Nb-2V-3Al alloy exhibits perfect superelasticity, about recovery strain of 3.2 % after the alloy aged at 573 K for 60 minutes.

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