Microstructure, mechanical and shape memory properties of Ti-55Ta- xSi biomedical alloys

The effects of Si addition on microstructures, mechanical and shape memory properties of Ti-55Ta biomedical alloy were investigated. The results show that the microstructures consist of mainly α″ martensite and a little β phase, and the grain size decreases obviously with increasing Si addition. Whe...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2011-02, Vol.21 (2), p.287-291
Main Authors: MA, Yun-qing, YANG, Shui-yuan, JIN, Wan-jun, WANG, Yun-neng, WANG, Cui-ping, LIU, Xing-jun
Format: Article
Language:English
Subjects:
Biocompatibility
grain refinement
Martensitic transformations
Microstructure
Precipitation
Shape memory alloys
shape memory effect
Silicon
Surgical implants
tensile
Ti-Ta alloy
Titanium base alloys
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Summary:The effects of Si addition on microstructures, mechanical and shape memory properties of Ti-55Ta biomedical alloy were investigated. The results show that the microstructures consist of mainly α″ martensite and a little β phase, and the grain size decreases obviously with increasing Si addition. When x = 0.2, small (Ti, Ta) 3Si precipitates are formed at grain boundaries. With further increasing Si content, the amount of the precipitates gradually increases. The tensile and yield strength of Ti-55Ta- xSi alloys gradually increase with increasing Si addition, whereas elongation decreases. Ti-55Ta-0.1Si alloy exhibits the lowest elastic modulus and the best shape memory recoverable strain. It is revealed that the refinement of grain and the precipitation of (Ti, Ta) 3Si phase are responsible to the changes of their mechanical and shape memory properties.
ISSN:1003-6326
DOI:10.1016/S1003-6326(11)60711-5