Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 835, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.142594
Keywords
Synchrotron diffraction; Shape memory alloys; NiTi; Martensitic transformation; Variant selection; Crystallographic texture
Categories
Funding
- DST-SERB Project [ECR/2016/000883]
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The in-situ deformation of Ni rich NiTi shape memory alloy was characterized using synchrotron diffraction. The study found that applied stress affects the texture of material and restricts the stress induced martensitic transformation. A strong lattice correspondence between the austenite and martensite phases along with a strong variant selection was observed.
In-situ deformation of Ni rich NiTi shape memory alloy is characterized using synchrotron diffraction. The changes in the texture of austenite and martensite phases as a function of applied stress were systematically investigated. Development of large elastic stresses with a concomitant plastic deformation have been found to restrict the stress induced martensitic transformation. A strong lattice correspondence between the austenite and martensite phases along with a strong variant selection is reported. Further, based on the inclination of the austenite orientations to the applied loading axis, stress induced martensitic transformation or dislocation slip is activated at higher stress. This leads to the strengthening of texture components of the austenite phase and a strong variant selection in the martensite phase.
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