Metastable dual-phase Ti-Nb-Sn-Zr and Ti-Nb-Sn-Fe alloys with high strength-to-modulus ratio

被引：14
作者：
Hsu, Hsueh-Chuan [1 ]
Wong, Ka-Kin [2 ]
Wu, Shih-Ching [1 ]
Chen, Yi-Xiang [2 ]
Ho, Wen-Fu [2 ]
机构：
[1] Cent Taiwan Univ Sci & Technol, Dept Dent Technol & Mat Sci, Taichung 40601, Taiwan
[2] Natl Univ Kaohsiung, Dept Chem & Mat Engn, 700 Kaohsiung Univ Rd, Kaohsiung 81148, Taiwan
来源：
MATERIALS TODAY COMMUNICATIONS | 2022年 / 30卷
关键词：
Titanium alloys; Dual-phase; Metastable; Elastic modulus; Strength-to-modulus ratio; MECHANICAL-PROPERTIES; YOUNGS MODULUS; DEFORMATION-BEHAVIOR; ALPHA'' MARTENSITE; FATIGUE-STRENGTH; SUPERELASTICITY; TI-33.6NB-4SN;
D O I：
10.1016/j.mtcomm.2022.103168
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Conventional dual-phase titanium (Ti) alloy exhibits high strength and toughness, but the high elastic modulus makes it unsuitable for biomedical implants. In this study, two novel metastable dual-phase (alpha"+beta) Ti-Nb-Sn-(Zr/Fe) systems have been developed using [Mo](eq) theory. The dual-phase alpha"+ beta structure contributed to the alloys' characteristics of high strength and low elastic modulus. The bending strengths of Ti-(16 22)Nb-8Sn(5 8)Zr and Ti-(17 19)Nb-8-Sn-(0.5-1.5)Fe alloys (1023-1190 MPa and 960-1308 MPa, respectively) were obviously higher than that of Ti-25 Nb-8Sn (962 MPa). Among them, both Ti-18Nb-8Sn-7Zr and Ti-19Nb-8Sn-0.5Fe with dual phase had lower elastic moduli (50.4 and 50.5 GPa, respectively) than Ti-25Nb-8Sn (52 GPa), which can avoid the stress shielding effect after implantation. Ti-18Nb-8Sn-7Zr and Ti-19Nb-8Sn-0.5Fe alloys exhibited greater bending strength-to-modulus ratios (20.3 and 19.0, respectively) than those of c.p. Ti (7.1) and Ti-25Nb-8Sn (18.5). Both dual-phase Ti-18Nb-8Sn-7Zr and Ti-19Nb-8Sn-0.5Fe with low elastic moduli and high strength-to-modulus ratios are promising candidates for bio-implant applications.
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页数：7
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