Low-Temperature XRD Study of Phase Transformations in NiTi and TiNiCo Shape Memory Alloys Used for the Preparation of the Prototypes of Medical Implants

Zdzisław Lekston; Maciej Zubko

doi:10.4028/www.scientific.net/SSP.203-204.125

Paper Titles

Analysis of Deformation Texture in AISI 304 Steel Sheets
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Textures of the Hot-Forged Ti6Al4V Alloy
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Influence of Cold Plastic Deformation on the Development of the Texture in High-Manganese Austenitic Steel
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Texturing of Magnetite Forming during Long-Term Operation of a Pipeline of 10CrMo9-10 Steel
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Low-Temperature XRD Study of Phase Transformations in NiTi and TiNiCo Shape Memory Alloys Used for the Preparation of the Prototypes of Medical Implants
p.125

XRD Based Methods of Investigation the Order - Disorder Transformation in the Spinel Structure - A Comparative Study
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Microstructure of Ni/Al₂O₃ Electrodeposited Coatings Studied with XRD and SEM Techniques
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Study of Fe₇₅Al₂₅ Alloys by the Mössbauer Spectroscopy Positron Annihilation Lifetime Spectroscopy (PALS), XRD and SEM
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Study of Structure and Strain in Au/Cu Systems Using Molecular Dynamics Simulation: X-Ray Scattering Analysis
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Low-Temperature XRD Study of Phase Transformations in NiTi and TiNiCo Shape Memory Alloys Used for the Preparation of the Prototypes of Medical Implants

Abstract:

The NiTi shape memory alloys with ternary additions of Co are being considered for future applications in the construction of medical products. In this study the commercially available Ni_50.8Ti_49.2 medical alloy and Ti₅₀Ni_48.7Co_1.3 alloy obtained by the conventional VIM technique, were used to prepare shape memory and superelastic staples. The phase transformations in the wires of those alloys after various thermo-mechanical and thermal treatments have been defined by the differential scanning calorimetry (DSC) method and three-point bending and free recovery ASTM F2082-06 tests. In this work the courses of phase transformations in the studied alloys were investigated by means of the low-temperature X-ray powder diffraction method. In both alloys after cold working and annealing during cooling two phase transformations occur: from parent B2-phase to rhombohedral R-phase and monoclinic B19’ martensite phase. Such phase transformations are fully reversible during heating and the obtained characteristic temperatures from DSC and X-ray powder diffraction measurements are in good agreement.