K. Kasuya, T. Inamura, H. Hosoda, K. Wakashima, Tokyo Institute of Technology, Yokohama, Japan; S. Miyazaki, University of Tsukuba, Tsukuba, Japan
Recently, Ni-free shape memory / superelastic alloys such as Ti-Nb-Sn, Ti-Nb-Al and Ti-Nb-Zr have been largely developed and they are expected to replace Ti-Ni in biomedical applications. In this study, we have focused on ternary Ti-Sn alloys containing several 3d transition metal elements such as Fe, and phase constitution and mechanical properties of the alloys were investigated in order to develop Ti-base shape memory alloys. All the alloys were made by Ar arc-melting method, homogenized at 1273K for 7.2ks, quenched into water and cold-rolled with 98% reduction of thickness. The rolled-sheets were solution-treated at 1273K for 1.8ks. Phase identification and mechanical properties were investigated by θ-2θX-ray diffraction analysis and tensile tests at room temperature. It was found that Fe addition was effective to stabilize ß(bcc) phase and to increase ultimate tensile strength (UTS). For example, Ti-5Fe-3Sn alloy (in mol%) was β single phase at room temperature and UTS was about 730MPa. Results of the other alloys were also presented.Recently, Ni-free shape memory / superelastic alloys such as Ti-Nb-Sn, Ti-Nb-Al and Ti-Nb-Zr have been largely developed and they are expected to replace Ti-Ni in biomedical applications. In this study, we have focused on ternary Ti-Sn alloys containing several 3d transition metal elements such as Fe, and phase constitution and mechanical properties of the alloys were investigated in order to develop Ti-base shape memory alloys. All the alloys were made by Ar arc-melting method, homogenized at 1273K for 7.2ks, quenched into water and cold-rolled with 98% reduction of thickness. The rolled-sheets were solution-treated at 1273K for 1.8ks. Phase identification and mechanical properties were investigated by q-2q X-ray diffraction analysis and tensile tests at room temperature. It was found that Fe addition was effective to stabilize b (bcc) phase and to increase ultimate tensile strength (UTS). For example, Ti-5Fe-3Sn alloy (in mol%) was b single phase at room temperature and UTS was about 730MPa. Results of the other alloys were also presented.
Summary: Recently, Ni-free shape memory / superelastic alloys such as Ti-Nb-Sn, Ti-Nb-Al and Ti-Nb-Zr have been largely developed and they are expected to replace Ti-Ni in biomedical applications. In this study, we have focused on ternary Ti-Sn alloys containing several 3d transition metal elements such as Fe, and phase constitution and mechanical properties of the alloys were investigated in order to develop Ti-base shape memory alloys. All the alloys were made by Ar arc-melting method, homogenized at 1273K for 7.2ks, quenched into water and cold-rolled with 98% reduction of thickness. The rolled-sheets were solution-treated at 1273K for 1.8ks. Phase identification and mechanical properties were investigated by
q-2
qX-ray diffraction analysis and tensile tests at room temperature. It was found that Fe addition was effective to stabilize
b (bcc) phase and to increase ultimate tensile strength (UTS). For example, Ti-5Fe-3Sn alloy (in mol%) was
b single phase at room temperature and UTS was about 730MPa. Results of the other alloys were also presented.
