Ni-Mn-Ga single crystals with very low twinning stress

Twinning stress or mechanical hysteresis associated with the twin boundary motion is one of the most essential parameters which determine the actuating performance of magnetic shape memory alloys. Recent effort at AdaptaMat Ltd. to decrease the twinning stress resulted in a consistent production of...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 303; no. 1; pp. 012079 - 10
Main Authors Straka, L, Hänninen, H, Soroka, A, Sozinov, A
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 06.07.2011
Subjects
Crystals
Manganese
Mechanical hysteresis
Nickel
Optimization
Physics
Shape memory alloys
Single crystals
Stresses
Twin boundaries
Twinning
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Summary:Twinning stress or mechanical hysteresis associated with the twin boundary motion is one of the most essential parameters which determine the actuating performance of magnetic shape memory alloys. Recent effort at AdaptaMat Ltd. to decrease the twinning stress resulted in a consistent production of Ni-Mn-Ga magnetic shape memory single crystals with the twinning stress of about 0.1 MPa, which is much lower than previously reported. In this work, the mechanical and magnetomechanical response of the developed crystals is discussed in detail and the importance of adjustment of the twin microstructure for obtaining an optimal actuating behavior is illustrated.
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ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/303/1/012079