期刊
ACTA MATERIALIA
卷 56, 期 18, 页码 5130-5137出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.06.030
关键词
Magnetic shape memory; Dynamic mechanical analysis; Twinning
资金
- DFG [SPP1239]
The actuation performance and twin-boundary velocity in bulk NiMnGa magnetic shape memory single crystals at various frequencies are investigated. A dynamic actuation experimental setup with the ability to apply mechanical stress and a high-frequency alternating magnetic field is developed in tandem with time-resolved optical microscopy. Reversible twin-boundary motion activated in the frequency range up to 600 Hz is directly observed. The maximum field-induced strain increases with actuation frequency. Strain hysteresis curves measured at different frequencies show similar onset fields of strain. The data imply that twin-boundary velocity is not the limiting factor on actuation performance. The results provide significant information on twin-boundary performance during high-frequency actuation. Crown copyright (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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