期刊
ACTA BIOMATERIALIA
卷 10, 期 2, 页码 1014-1023出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2013.10.034
关键词
Biomedical titanium alloys; Carbon limit; Titanium carbides; 3-D tomography
资金
- Queensland Centre for Advanced Materials Processing and Manufacturing
- Queensland Smart Future Fellowship
The formation of grain boundary (GB) brittle carbides with a complex three-dimensional (3-D) morphology can be detrimental to both the fatigue properties and corrosion resistance of a biomedical titanium alloy. A detailed microscopic study has been performed on an as-sintered biomedical Ti-15Mo (in wt.%) alloy containing 0.032 wt.% C. A noticeable presence of a carbon-enriched phase has been observed along the GB, although the carbon content is well below the maximum carbon limit of 0.1 wt.% specified by ASTM Standard F2066. Transmission electron microscopy (TEM) identified that the carbon-enriched phase is face-centred cubic Ti2C. 3-D tomography reconstruction revealed that the Ti2C structure has morphology similar to primary alpha-Ti. Nanoindentation confirmed the high hardness and high Young's modulus of the GB Ti2C phase. To avoid GB carbide formation in Ti-15Mo, the carbon content should be limited to 0.006 wt.% by Thermo-Calc predictions. Similar analyses and characterization of the carbide formation in biomedical unalloyed Ti, Ti-6Al-4V and Ti-16Nb have also been performed. (C) 2013 Acts Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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