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Shape Memory and Superelasticity

Published in:

12-11-2018

Influence of Micro-EDM on the Phase Transformation Behaviour of Medical-Grade Nitinol

Authors: James Wamai Mwangi, Linda Weisheit, Viet Duc Bui, Matin Yahyavi Zanjani, Andreas Schubert

Published in: Shape Memory and Superelasticity | Issue 4/2018

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Abstract

Most nitinol medical applications are hinged on its superelasticity and shape memory—two unique properties that are dependent on nitinol’s phase transformation between a martensitic phase and an austenitic phase. Since these transformations are thermomechanical in nature, establishing the influence of thermal processing on nitinol’s phase-transformation behaviour is vital as this can help in predicting changes and/or tuning its mechanical properties to fit specific applications. This study uses differential scanning calorimetry to investigate the influence of micro-electrical discharge machining (micro-EDM) on nitinol’s phase-transformation behaviour. For conclusive analysis, a relatively athermal Jet-ECM process is used as a reference for the as-received material, whereas Laser, a more commercially established medical-grade nitinol machining process, is used to provide comparative analytical aid. From the results, it can be clearly shown that high discharge energies in micro-EDM do indeed have the potential to significantly alter nitinol’s transformation behaviour, including reducing thermal hysteresis and resulting in the occurrence of an unusual three-peak phenomenon in the endothermic reverse transformation on heating.

previous article Stress Wave and Phase Transformation Propagation at the Atomistic Scale in NiTi Shape Memory Alloys Subjected to Shock Loadings

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Title: Influence of Micro-EDM on the Phase Transformation Behaviour of Medical-Grade Nitinol
Authors: James Wamai Mwangi
Linda Weisheit
Viet Duc Bui
Matin Yahyavi Zanjani
Andreas Schubert
Publication date: 12-11-2018
Publisher: Springer International Publishing
Published in: Shape Memory and Superelasticity / Issue 4/2018
Print ISSN: 2199-384X
Electronic ISSN: 2199-3858
DOI: https://doi.org/10.1007/s40830-018-00195-1

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