Relaxation in Ni–Mn–Ga ferromagnetic shape memory alloys

X. Jin Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

D. Bono Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

C. Henry Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

J. Feuchtwanger Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

S. M. Allen Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

R. C. O'Handley Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

Abstract

Evidence of relaxation has been observed in ferromagnetic Ni–Mn–Ga single crystals. The relaxation may be explained by a change in symmetry-conforming short-range ordering according to Ren and Otsuka in this off-stoichimetric ordered alloy. Martensite stabilization has also been found after martensite ageing.

Acknowledgements

The author, X. Jin, gratefully appreciates the financial support received from Shanghai Jiao Tong University during his stay at Massachusetts Institute of Technology (MIT). The authors also wish to thank Ms Y. L. Xie and Mr J. K. Huang, MIT, for help with the sample treatments and measurements. The crystals used in our study were grown by Dr Tom Lograsso of Ames Laboratory (US Department of Energy).

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Relaxation in Ni–Mn–Ga ferromagnetic shape memory alloys

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Relaxation in Ni–Mn–Ga ferromagnetic shape memory alloys

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