Effect of Heat Treatment and Sn Content on Superelasticity in Biocompatible TiNbSn Alloys

Abstract

Martensitic transformation and tensile properties of 4 to 5 mol%Sn-doped Ti-16 mol%Nb alloys consisting of biocompatible elements were investigated to provide superelasticity for biomedical applications as a function of heat treatment and Sn content. Martensitic transformation (bcc to orthorhombic structure) is accelerated at such quenching conditions that the bcc parent phase is slightly decomposed. Martensitic transformation temperature decreases rapidly with increasing Sn content. In-situ optical microscopic observation on cooling and heating indicates that the martensite is thermoelastic, corresponding to small temperature hysteresis between the martensitic and the reverse transformations, which is determined by differential scanning calorimetry. By controlling the heat treatment condition and Sn content, large superelastic strain is obtained at room temperature.

Mechanical Properties and Bio-Compatibility of Ti-Nb-Zr-HA Biomaterial Fabricated by Rapid Sintering Using HEMM Powders

“…4) 이러한 문제점을 극복하기 위하여 Nb, Zr, Ta, Sn 그리고 Mo 등과 같은 무독성 원소를 사용한 Ti 합금의 개발이 진행되고 있다. [5][6] 또한 Ti-6Al-4V ELI 합금보다 낮은 영률과 높은 압축 강도를 얻을 수 있는 β-titanium합금도 연구되고 있다. [7][8][9][10][11] HA는 인간의 뼈와 치아를 구성하는 무기물질과 생물 학적, 화학적으로 매우 유사하다고 알려져 있다.…”

Effect of Nitrogen Addition on Superelasticity of Ti-Zr-Nb Alloys

“…In Ti-Nb binary alloys, superelastic behavior was observed at room temperature when the Nb content is 26$27 at% Nb. 1) The superelasticity has been also reported in ternary alloys such as Ti-Nb-Sn, 2) Ti-Nb-Zr, 3) Ti-Nb-Ta, 4) Ti-Nb-Al, 5) Ti-Nb-Pt 6) and Ti-Nb-O. 7) In addition, it has been also reported that the superelasticity was observed in Ti-Mobased alloys such as Ti-Mo-Sn, 8) Ti-Mo-Sc 9) and Ti-MoGa.…”

“…This has led to the development of Ni-free -Ti base shape memory alloys which consist of only non-toxic elements. [1][2][3][4][5][6][7][8][9][10][11][12] In -Ti alloys, superelasticity is associated with a stress induced martensitic transformation from the phase (bcc) to 00 martensite phase (orthorhombic) by loading and its reverse transformation by unloading. The control of the martensitic transformation temperatures by the adjustment of the amount of -stabilizer elements such as Nb, Mo and Ta is necessary to obtain the superelasticity in Ti-base alloys.…”

Effect of Cooling Rate on Superelasticity and Microstructure Evolution in Ti-10V-2Fe-3Al and Ti-10V-2Fe-3Al-0.2N Alloys

“…In conventional shape memory alloys such as Ti-Ni alloys, its shape memory and superelastic properties are often improved by heat treatments after the solution treatment. In development of titanium shape memory alloys, however, there are only several studies on the enhancement of the shape memory effect or superelasticity by controlling the cooling rate from -solution temperature 5) or aging after solution treatment. 6,[13][14][15] Optimum microstructure and processing conditions for the enhancement of the shape memory effect or superelasticity in titanium alloys have not been well understood yet.…”

“…1) Since then, several titanium alloys exhibiting the shape memory effect and/or superelasticity have been reported in Ti-Mo-Al 2) and Ti-V-Al 3) ternary alloys and in a Ti-10V-2Fe-3Al alloy 4) which is one of the practical titanium alloys for structural use. Recently, much attention has been paid to Ni-free titanium shape memory and superelastic alloys for biomedical use due to the cytotoxicity of Ni, leading to the recent development of Ti-Nb based [5][6][7][8][9] and Ti-Mo based [10][11][12] alloys. Previous studies mostly focused on finding out the optimum composition for shape recovery in the quenched state.…”