Pre-martensitic phenomena in a near stoichiometric Ni2MnGa polycrystalline alloy
|Jose Ignacio Perez-Landazabal 2, Vicente Sanchez-Alarcos , Vicente Recarte , Cristina Gomez-Polo , Volodymyr A. Chernenko 1,3,4|
1. Institute of Magnetism NASU (IMag), Vernadsky 36-b, Kyiv 03142, Ukraine
The Internal Friction (IF), the elastic modulus and the magnetic susceptibility of a near stoichiometric Ni2MnGa polycrystalline sample have been measured as a function of temperature from parent phase down to well below martensitic transformation temperature (MS) by Resonant ultrasound spectroscopy (RUS) and superconducting quantum interference device (SQUID) measurements. Two IF peaks and two minima in the elastic modulus have been observed, corresponding to the weakly 1ST order transition from the cubic L21 parent phase to the intermediate phase (at T1 = 220K) and to the Martensitic Transformation (at T2 = 120K). The real part of the magnetic susceptibility shows a decrease and the imaginary part a peak at T1.
Presentation: poster at E-MRS Fall Meeting 2005, Symposium C, by Jose Ignacio Perez-Landazabal
See On-line Journal of E-MRS Fall Meeting 2005
Submitted: 2005-05-30 14:36 Revised: 2009-06-07 00:44