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In Situ Synchrotron Diffraction Assessment of Reversibility of the Martensitic Transformation in Single-Crystalline Co–Ni–Ga Shape Memory Alloy Under Torsion

Heusler-type Co–Ni–Ga shape memory alloys attracted significant attention due to their excellent functional properties in single-crystalline state under both compressive and tensile loading. The present study investigates the superelastic deformation behavior under torsion. Using a newly installed torsion testing setup, in situ synchrotron diffraction was carried out on single-crystalline material in order to investigate the martensitic phase transformation. Incremental deformation experiments reveal a fully reversible martensitic transformation under torsional loading at room temperature, leading to excellent strain recovery after deformation to 6.5% shear strain. Furthermore, relevant aspects towards the analysis of powder diffraction data obtained for single-crystalline material in transmission mode under torsional loading are presented and critically discussed.

Sponsor
Gefördert im Rahmen des Projekts DEAL
Citation
In: Shape Memory and Superelasticity Volume 10 / Issue 3 (2024-07-08) , S. 326-333; eissn:2199-3858
Collections
@article{doi:10.17170/kobra-2024102511007,
  author    ={Lauhoff, Christian and Degener, Sebastian and Bolender, Artjom and Liehr, Alexander and Hübner, Leoni and Frenck, Johanna-Maria and Molotnikov, Andrey and Niendorf, Thomas},
  title    ={In Situ Synchrotron Diffraction Assessment of Reversibility of the Martensitic Transformation in Single-Crystalline Co–Ni–Ga Shape Memory Alloy Under Torsion},
  keywords ={600 and Memory-Legierung and Pseudoelastizität and Martensitumwandlung and Beugung and In situ and Torsion},
  copyright  ={http://creativecommons.org/licenses/by/4.0/},
  language ={en},
  journal  ={Shape Memory and Superelasticity},
  year   ={2024-07-08}
}