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In-situ neutron diffraction study of martensitic variant redistribution in polycrystalline Ni-Mn-Ga alloy under cyclic thermo-mechanical treatment

Abstract : The influences of uniaxial compressive stress on martensitic transformation were studied on a polycrystalline Ni-Mn-Ga bulk alloy prepared by directional solidification. Based upon the integrated in-situ neutron diffraction measurements, direct experimental evidence was obtained on the variant redistribution of seven-layered modulated (7M) martensite, triggered by external uniaxial compression during martensitic transformation. Large anisotropic lattice strain, induced by the cyclic thermo-mechanical treatment, has led to the microstructure modification by forming martensitic variants with a strong < 0 1 0 >(7M) preferential orientation along the loading axis. As a result, the saturation of magnetization became easier to be reached.
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https://hal.univ-lorraine.fr/hal-01503890
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Submitted on : Friday, April 7, 2017 - 5:16:56 PM
Last modification on : Tuesday, March 30, 2021 - 3:12:02 PM

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Zongbin Li, Yudong Zhang, Claude Esling, Weimin Gan, Naifu Zou, et al.. In-situ neutron diffraction study of martensitic variant redistribution in polycrystalline Ni-Mn-Ga alloy under cyclic thermo-mechanical treatment. Applied Physics Letters, American Institute of Physics, 2014, 105 (2), ⟨10.1063/1.4890598⟩. ⟨hal-01503890⟩

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