Observation of martensite phase transformation in shape memory alloys using a combined XRD-DIC technique

Abstract : Shape memory alloys (SMA), Ni-Ti alloy for example, have widely industrial applications because of their super-elasticity or shape memory properties. However, the potential coexistence of three principal phases (Austenite, Martensite, and R phase) depending on the various thermo-mechanical loading conditions thus exhibiting different transformation deformation, makes further industrial applications a difficult task. For any tentative of multi-axial modeling validation, it appears relevant to get an estimation of strain field correlated with the local volume fraction of phases during a mechanical test. Combined DIC-XRD observation has been carried out for that purpose.
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Xuyang Chang, Karine Lavernhe-Taillard, Olivier Hubert. Observation of martensite phase transformation in shape memory alloys using a combined XRD-DIC technique. ESOMAT 2018 11th European Symposium on Martensitic Transformations, Aug 2018, Metz, France. ⟨hal-01889571⟩

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