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Change of microstructure during training of a Ni50Mn29Ga21 bicrystal

 
: Chulist, R.; Skrotzki, W.; Oertel, C.-G.; Böhm, A.; Pötschke, M.

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Scripta materialia 63 (2010), Nr.5, S.548-551
ISSN: 1359-6462
Englisch
Zeitschriftenaufsatz
Fraunhofer IWU ()
NiMnGa; martensite; training; twinning

Abstract
The change in microstructure during training of a Ni50Mn29Ga21 bicrystal was investigated by electron backscatter diffraction in a scanning electron microscope. The martensitic variants form macro and micro twins which are twin related with each other. The twin plane is of type. To achieve magnetic field induced strain in Ni–Mn–Ga alloys, a training process was applied. This process consists of successively compressing the sample along two axes. As a result the twinning stress is reduced and the twinning strain is maximized.

: http://publica.fraunhofer.de/dokumente/N-137403.html