Elastic constants of Ni-Mn-Ga magnetic shape memory alloys

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2004-08-31
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Stipcich, Marcelo
Mañosa, Lluís
Planes, Antoni
Morin, Michel
Zarestky, Jerel
Stassis, C.
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Lograsso, Thomas
Ames Laboratory Division Director
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

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We have measured the adiabatic second order elastic constants of two Ni-Mn-Ga magnetic shape memory crystals with different martensitic transition temperatures, using ultrasonic methods. The temperature dependence of the elastic constants has been followed across the ferromagnetic transition and down to the martensitic transition temperature. Within experimental errors no noticeable change in any of the elastic constants has been observed at the Curie point. The temperature dependence of the shear elastic constant C′ has been found to be very different for the two alloys. Such a different behavior is in agreement with recent theoretical predictions for systems undergoing multi-stage structural transitions.

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This article is from Physical Review B 70 (2004): 054115, doi:10.1103/PhysRevB.70.054115.

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Thu Jan 01 00:00:00 UTC 2004
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