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Published in:
2010 | OriginalPaper | Chapter
Shape Memory Characteristics of Gas-Atomized Ti-Ni-Mo Powders
Authors : Y. W. Kim, Y. J. Lee
Published in: 6th World Congress of Biomechanics (WCB 2010). August 1-6, 2010 Singapore
Publisher: Springer Berlin Heidelberg
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In order to use the excellent superelastic property of shape memory alloys in many medical applications, the austenite transformation finish temperature (A
f
) must be about 37°C which is human body temperature. In this study, the transformation temperature could be controlled by substitution of Mo for Ni in Ti-Ni alloy. For the fabrication of bulk near-net-shape shape memory alloys and porous metallic biomaterials, consolidation of Ti-Ni-Mo alloy powders is more useful than that of elemental powders of Ti, Ni and Mo. Ti
50
Ni
49.7
Mo
0.3
shape memory alloy powders were prepared by gas atomization, and transformation temperatures and microstructures of those powders were investigated as a function of powder size. According to DSC analysis of the as-atomized Ti-Ni-Mo powders, the austenite transformation finish temperature of Ti
50
Ni
49.7
Mo
0.3
powders was 39°C. Evaluation of powder microstructures was based on SEM examination of the surface and the polished and etched powder cross sections and the typical images of the rapidly solidified powders showed cellular morphology.