Abstract
The microstructure evolution of the magnetic-field-induced transition in Ni44.4Mn44.8Sn10.8 alloy was directly observed using in situ optical microscope under pulsed high magnetic field. The microscopic observations indicate that the growth of austenite during magnetic field application might be through the movement of the interface between martensite and austenite phases. This kind of induced austenite state is stable and remained even removing the magnetic field. Based on the experimental results, the change of the brightness contrast might be used to further investigate this irreversibility of the magnetostructural transition and determine the critical transition magnetic fields.
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Acknowledgments
The authors thank the Natural Science Foundation of China (Grant No. 11104065 and 11174231), Postdoctoral Science Foundation of China (Grant No. 2013M542008), Guangxi Key Laboratory of Information Materials (Guilin University of Electronic Technology) (Grant No. 1210908-05-K), and Hubei Provincial Department of Education (Grant No. Q20120108) for their financial supports.
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Shen, Y., Wang, R., Sun, Z. et al. Direct observation of magnetostructural transition in the Ni–Mn–Sn alloy using in situ optical microscope. J Mater Sci: Mater Electron 25, 2030–2034 (2014). https://doi.org/10.1007/s10854-014-1822-5
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DOI: https://doi.org/10.1007/s10854-014-1822-5