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Polycrystalline Ni–Mn–Ga samples were directionally solidified and trained in order to lower the twinning stress. Polyurethane was used to fill the cracks. Magnetic-field-induced strain (MFIS) was measured in a rotating magnetic field over more than 10 6 cycles. The operating temperature was varied between 0 and 45°C. With increasing temperature, the MFIS increased from 0.6% to 1.2%. After...
The influence of annealing temperature and time on grain growth in polycrystalline Ni–Mn–Ga samples near the stoichiometric composition Ni 2 MnGa was investigated. Grain growth was only observed for compositions with a Ni-content below 50at.%. The existence of constitutional vacancies as a possible origin for the different grain growth behavior was excluded by positron annihilation spectroscopy...
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