期刊
APPLIED PHYSICS LETTERS
卷 103, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4819335
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资金
- German Federal Ministry of Education and Research (BMBF) [03X3526A]
- German Research Society (DFG) [Sk 21/22-3]
Mechanical and synchrotron diffraction experiments were performed to investigate the temperature dependent structural changes in a Ni-Mn-Ga single crystal. The initial sample exhibits a mixture of seven-layered (7M) and non-modulated (NM) martensites at room temperature. Compression along < 100 > resulted in a strain of 18%, indicating a stress-induced intermartensitic transformation from the 7M to the NM phase. The thermally induced intermartensitic transformation follows the sequence 5M -> 7M -> NM during cooling from the austenite phase. The structural changes are quantitatively reflected in the mechanical response. A twinning stress of 3.8 MPa is measured at 90 degrees C, which is the lowest reported in high-temperature Ni-Mn-Ga structures. (C) 2013 AIP Publishing LLC.
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