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Twin microstructure in 5M Ni-Mn-Ga alloys

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

Abstract urn:nbn:de:0011-n-1747549 (765 KByte PDF)
MD5 Fingerprint: 4c1d0fceef9f4183805a8183995860d4
Erstellt am: 2.8.2011

Leibniz-Institut für Festkörper- und Werkstoffforschung, Dresden:
3rd International Conference on Ferromagnetic Shape Memory Alloys, ICFSMA 2011. Book of Abstracts : July 18-22, 2011, Dresden
Dresden, 2011
2 S.
International Conference on Ferromagnetic Shape Memory Alloys (ICFSMA) <3, 2011, Dresden>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IWU ()

A very interesting feature of the martensitic transformation is the microstructure it produces. The initial microstructure of 5M Ni-Mn-Ga alloys is a typical self-accommodated martensite containing a mixture of variants. The 5M Ni-Mn-Ga single and polycrystals investigated consist of macro and micro twins. The macro twins are observed as lamellae separating fine twins which frequently cross the coarse variants in a zig-zag manner with mirror symmetry. However, materials with a very large or small grain size show some deviation from this configuration indicating that the arrangement of martensitic variants is significantly affected by grain size. Moreover, fine-grained material does not completely transform to martensite giving rise to some residual austenite. The results are discussed with respect to grain size, deformation mode and phase transformations.