Pre-martensitic phenomena in a near stoichiometric Ni2MnGa polycrystalline alloy

Jose Ignacio Perez-Landazabal 2Vicente 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
2. Universidad Publica de Navarra (UPNa), Campus de Arrosadia, Pamplona 31006, Spain
3. Institute of Magnetism, N.A.S. of Ukraine, 36-b Vernadsky Blvd, Kyiv 252142, Ukraine
4. Institute of Magnetism, NAS of Ukraine, 36-B Vernadsky str., Kiev 03142, Ukraine

Abstract

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.

 

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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