Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 27    No. 7    July 2017

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Effects of cold deformation on microstructure and mechanical properties of Ti-35Nb-2Zr-0.3O alloy for biomedical applications
Chun-bo LAN, Guo LI, Yu WU, Li-li GUO, Feng CHEN

Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University, Nanjing 211189, China

Abstract:The Ti-35Nb-2Zr-0.3O (mass fraction, %) alloy was melted under a high-purity argon atmosphere in a high vacuum non-consumable arc melting furnace, followed by cold deformation. The effects of cold deformation process on microstructure and mechanical properties were investigated using the OM, XRD, TEM, Vicker hardness tester and universal material testing machine. Results indicated that the alloy showed multiple plastic deformation mechanisms, including stress-induced α" martensite (SIM α") transformation, dislocation slipping and deformation twins. With the increase of cold deformation reduction, the tensile strength and hardness increased owing to the increase of dislocation density and grain refinement, and the elastic modulus slightly increased owing to the increase of SIM α" phase. The 90% cold deformed alloy exhibited a great potential to become a new candidate for biomedical applications since it possessed low elastic modulus (56.2 GPa), high tensile strength (1260 MPa) and high strength-to-modulus ratio (22.4×10-3), which are superior than those of Ti-6Al-4V alloy.

 

Key words: Ti-35Nb-2Zr-0.3O alloy; cold deformation; microstructure; mechanical properties; biomedical material

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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