Influence of grain size and training temperature on strain of polycrystalline Ni50Mn29Ga21 samples

Hurrich, C., Roth, S., Wendrock, H., Potschke, M., Cong, D. Y., Rellinghaus, B. and Schultz, L. 2011, Influence of grain size and training temperature on strain of polycrystalline Ni50Mn29Ga21 samples, Journal of physics : conference series, vol. 303, no. 1, pp. 1-7.

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Title Influence of grain size and training temperature on strain of polycrystalline Ni50Mn29Ga21 samples
Author(s) Hurrich, C.
Roth, S.
Wendrock, H.
Potschke, M.
Cong, D. Y.
Rellinghaus, B.
Schultz, L.
Journal name Journal of physics : conference series
Volume number 303
Issue number 1
Start page 1
End page 7
Total pages 7
Publisher Institute of Physics Publishing
Place of publication Bristol, England
Publication date 2011
ISSN 1742-6588
Keyword(s) austenitic phase
austenitic state
electron back scatter diffraction
external magnetic field
fibre texture
grain size
high temperature
magnetic shape memory materials
mechanical training
polycrystalline samples
room temperature
Summary The alloy Ni-Mn-Ga aroused great interest for application as a magnetic shape memory (MSM) material. This effect is caused by reorientation of twin variants by an external magnetic field. So far, most of the experiments were concentrated on single crystals. But, the MSM effect can also be realised in polycrystals which can be prepared much more efficiently. Here, polycrystalline samples were prepared by directional solidification with a <100> fibre texture of the high temperature cubic austenitic phase parallel to the heat flow. Afterwards, a heat treatment was applied for chemical homogenisation and stress relaxation in the austenitic state. Then the samples were heated up to the austenitic state and cooled down under load. The microstructure was analysed by Electron Back Scatter Diffraction (EBSD) before and after that treatment. Mechanical training at room temperature and 40°C was tracked by recording stress-strain curves. By increasing the number of training cycles the strain also increases. The influence of different training temperatures was investigated on samples with different grain sizes.
Notes Paper presented at the Joint European Magnetic Symposia – JEMS 2010
Language eng
Field of Research 091205 Functional Materials
Socio Economic Objective 861299 Fabricated Metal Products not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
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Document type: Journal Article
Collections: Institute for Frontier Materials
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