Theoretical Study of Magnetic Properties and Twin Boundary Motion in Heusler Ni-Mn-X Shape Memory Alloys Using First Principles and Monte Carlo Method

Abstract:

In this paper we firstly propose and study a microscopic model of twin boundary motion in the Heusler Ni-Mn-X (X= Ga, In, Sb, Sn) alloys on real tetragonal lattice using the first principles and Monte Carlo simulations. The two variants of the low temperature martensite which divided by twin boundary are considered. The Heisenberg model for magnetic subsystem and the Blume-Emery-Griffiths (BEG) one for structural subsystem with magnetostructural interaction between these subsystems are used. The influence of external magnetic field and anisotropy on the twin boundary motion is studied. It is shown that proposed model gives the picture of twin boundary motion as in experiments.

• Periodical: Advances in Science and Technology (Volume 78)
• Pages: 7-12
• DOI: https://doi.org/10.4028/www.scientific.net/AST.78.7
• Online since: September 2012
• Authors: Konstantin I. Kostromitin, Vasiliy D. Buchelnikov, Vladimir V. Sokolovskiy, Peter Entel
• Keywords: First-Principle, Heusler Alloy, Monte Carlo Simulations, Twin Boundary Motion

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