Paper Titles
Preparation by Twin Roll Casting and Characterization of TiNi Shape Memory Alloys Strips
p.121
Effect of L21 Ordering on the Martensitic and Intermartensitic Transformations in a Ni-Mn-Ga Shape Memory Alloy
p.127
The Effect of the Annealing Parameters on the Structure and Characteristic Temperatures of the Nonstoichiometric Ni2MnGa Alloys
p.135
Martensitic Transformation, Structure and Magnetic Properties of Co-Ni-Ga Ferromagnetic Shape Memory Alloys
p.141
Phase Transformation in Ti-Ni-Ta Shape Memory Alloy
p.147
Characterization of Nitrided/Oxidized Layers Covering Ni-Ti Shape Memory Alloy
p.151
Characterisation of β Phase in WE54 Magnesium Alloy
p.155
Morphology of Precipitates in Ni-Al-Cr Intermetallic Alloy
p.159
Precipitation of Phases in Al-Mg-Si-Cu Alloy with Sc and Zr Additions during Heat Treatment
p.163

Phase Transformation in Ti-Ni-Ta Shape Memory Alloy

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Abstract:

A new Ti50Ni48.7Ta1.3 shape memory alloy was designed for medical application. In order to influence the martensitic transformation temperature the alloy was solution treated and additionally aged at 400oC for various time. Phase transformation was studied applying differential scanning calorimeter (DSC) and X-ray diffraction techniques. The ageing causes that the martensitic transformation occurs in two steps: B2↔R↔B19’ during cooling and heating. During cooling the transformations: B2→R and R→B19’ are well separated whereas on heating they are overlapped. Also ageing causes a shift of temperatures of the martensitic transformation into the higher region. It is due to the precipitation process. Precipitates of the Ni4Ti3 phase were observed. Applied thermal treatment leads to shift of the transformation temperatures below temperature of a human body. This makes the Ti-Ni-Ta alloy attractive for application in medicine.

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Periodical:

Solid State Phenomena (Volume 130)

Pages:

147-150

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.130.147

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Online since:

December 2007

Authors:

Zdzisław Lekston, Tomasz Goryczka

Keywords:

NiTiTa Alloy, Phase Transformation, Shape Memory

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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