Heterogeneous structure and mechanical hardness of biomedical beta-type Ti-29Nb-13Ta-4.6Zr subjected to high-pressure torsion

Yilmazer, Hakan; Niinomi, M.; Nakai, M.; Hieda, J.; TODAKA, Y.; AKAHORI, T.; Miyazaki, T.

doi:10.1016/j.jmbbm.2012.02.022

Heterogeneous structure and mechanical hardness of biomedical beta-type Ti-29Nb-13Ta-4.6Zr subjected to high-pressure torsion

Atıf İçin Kopyala

Yilmazer H., Niinomi M., Nakai M., Hieda J., TODAKA Y., AKAHORI T., ...Daha Fazla

JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, cilt.10, ss.235-245, 2012 (SCI-Expanded)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 10
Basım Tarihi: 2012
Doi Numarası: 10.1016/j.jmbbm.2012.02.022
Dergi Adı: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Sayfa Sayıları: ss.235-245
Yıldız Teknik Üniversitesi Adresli: Hayır

Özet

A novel beta-type titanium alloy, Ti-29Nb-13Ta-4.6Zr (TNTZ), has been developed as a candidate for biomedical applications. TNTZ exhibits non-toxicity and a low Young's modulus close to that of bone (10-30 GPa). Such a low Young's modulus of this alloy is achieved by comprising a single metastable beta phase. Greater mechanical biocompatibility, which implies higher mechanical strength and hardness while maintaining a low Young's modulus, has been aimed for TNTZ. Therefore, strengthening by grain refinement and increasing dislocation density is expected to provide TNTZ high mechanical strength while keeping a low Young's modulus because they keep the original beta phase. In this case, high-pressure torsion (HPT) processing is one of the effective ways to obtain these properties simultaneously in TNTZ. Thus, in this study, the effect of HPT processing on the microstructure and mechanical hardness of TNTZ was systematically investigated at rotation numbers (N) of 1 to 20 under a pressure of around 1.25 GPa at room temperature.