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The Effect of Hydrogen on Martensite Transformations and the State of Hydrogen Atoms in Binary TiNi-Based Alloy with Different Grain Sizes
Open AccessArticle

Microstructure Formation in Cast TiZrHfCoNiCu and CoNiCuAlGaIn High Entropy Shape Memory Alloys: A Comparison

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G.V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine, 36 Vernadsky blvd., 03680 Kiev, Ukraine
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Institut für Werkstoffkunde (Materials Science) Leibniz Universität Hannover, An der Universität 2, 30823 Garbsen, Germany
*
Author to whom correspondence should be addressed.
Materials 2019, 12(24), 4227; https://doi.org/10.3390/ma12244227
Received: 6 November 2019 / Revised: 4 December 2019 / Accepted: 13 December 2019 / Published: 16 December 2019
The present study is dedicated to the microstructure characterization of the as-cast high entropy intermetallics that undergo a martensitic transformation, which is associated with the shape memory effect. It is shown that the TiZrHfCoNiCu system exhibits strong dendritic liquation, which leads to the formation of martensite crystals inside the dendrites. In contrast, in the CoNiCuAlGaIn system the dendritic liquation allows the martensite crystals to form only in interdendritic regions. This phenomenon together with the peculiarities of chemical inhomogeneities formed upon crystallization of this novel multicomponent shape memory alloys systems will be analyzed and discussed. View Full-Text
Keywords: dendritic liquation; martensitic transformation; high entropy shape memory alloys dendritic liquation; martensitic transformation; high entropy shape memory alloys
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Kosorukova, T.A.; Gerstein, G.; Odnosum, V.V.; Koval, Y.N.; Maier, H.J.; Firstov, G.S. Microstructure Formation in Cast TiZrHfCoNiCu and CoNiCuAlGaIn High Entropy Shape Memory Alloys: A Comparison. Materials 2019, 12, 4227.

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