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Cast and Rolling Textures of NiMnGa Alloys

Published online by Cambridge University Press:  01 February 2011

Robert Chulist
Affiliation:
robert.chulist@physik.tu-dresden.de, TU Dresden, Institut für Strukturphysik, Zellescher Weg 16, Dresden, 01062, Germany
Martin Poetschke
Affiliation:
m.poetschke@ifw-dresden.de, Leibniz-Institut für Festkoerper- und Werkstoffforschung, Dresden, 01069, Germany
Andrea Boehm
Affiliation:
andrea.boehm@iwu.fraunhofer.de, Fraunhofer-Institut fuer Werkzeugmaschinen und Umformtechnik, Dresden, 01187, Germany
Heinz-Guenter Brokmeier
Affiliation:
heinz-guenter.brokmeier@gkss.de, GKSS Forschungszentrum, Geesthacht, 21494, Germany
Ulf Garbe
Affiliation:
ulf.garbe@gkss.de, GKSS Aussenstation, ZWE FRM II, Garching, 85747, Germany
Thomas Lippmann
Affiliation:
thomas.lippmann@gkss.de, GKSS Forschungszentrum, Geesthacht, 21502, Germany
Carl-Georg Oertel
Affiliation:
oertel@physik.tu-dresden.de, TU Dresden, Institut für Strukturphysik, Zellescher Weg 16, Dresden, 01062, Germany
Werner Skrotzki
Affiliation:
werner.skrotzki@physik.tu-dresden.de, TU Dresden, Institut für Strukturphysik, Zellescher Weg 16, Dresden, 01062, Germany
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Abstract

The texture of two polycrystalline NiMnGa magnetic shape memory alloys fabricated by directional solidification and hot rolling has been measured with high-energy synchrotron radiation and neutron diffraction. At room temperature the alloys used are composed of a modulated (7M) and non-modulated (NM) martensitic structure. The texture of the directionally solidified alloy for all phases is a pronounced fibre texture with <100> preferentially aligned along the growth direction. In the directionally solidified case a variant selection took place with [001] dominating. The texture of the hot rolled alloy shows a weak recrystallization texture with {111} and <112> aligned parallel to the rolling plane and rolling direction, respectively. The texture results are discussed with respect to material, processing and phase transformations including variant selection.

Type
Research Article
Copyright
Copyright © Materials Research Society 2008

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References

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