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HomeMaterials Science ForumMaterials Science Forum Vol. 879Phase Constitution and Martensitic Transformation...

Phase Constitution and Martensitic Transformation Behavior of Au-51Ti-18Co Biomedical Shape Memory Alloy Heat-Treated at 1173K to 1373K

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Abstract:

Phase constitution and martensitic transformation behavior were investigated for a Au–51Ti–18Co alloy heat-treated at 1173 K to 1373 K for 3.6 ks. The Au–51Ti–18Co alloy was fabricated by Ar arc-melting technique and subsequently by hot-forging at 1423 K for 10.8 ks. X-ray diffraction analysis revealed that B2 parent phase, B19 martensite phase and AuTi₃ simultaneously appeared regardless of the heat-treatment temperatures. By increasing the heat-treatment temperature, the volume fraction of AuTi₃ was slightly reduced. Besides, the lattice transformation strain which was calculated from the precisely-determined lattice parameters was evaluated to be 7 % in the Au–51Ti–18Co alloy in all the heat-treated conditions. This value is comparable to that of NiTi practical alloys. From differential scanning calorimetry (DSC) analysis, reverse martensitic transformation temperature was slightly increased with the heat-treatment temperature. From the lattice transformation strain point of views, the Au–51Ti–18Co has a large potential for novel biomedical shape memory alloy.

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THERMEC 2016

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Periodical:

Materials Science Forum (Volume 879)

Pages:

256-261

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.879.256

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Online since:

November 2016

Authors:

Taywin Buasri*, Hyun Bo Shim, Masaki Tahara, Tomonari Inamura, Kenji Goto, Hiroyasu Kanetaka, Yoko Yamabe-Mitarai, Hideki Hosoda

Keywords:

AuTiCo, Biomedical Shape Memory Alloy, Heat-Treatment, Lattice Transformation Strain, Martensitic Transformation

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