Producción CyT
Modelling of chemical and magnetic order in Ni-Mn-Al shape memory alloys using Monte Carlo simulations
Articulo
Fecha:
2023Editorial y Lugar de Edición:
ELSEVIER SCIENCE BVRevista:
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol. 585 ELSEVIER SCIENCE BVResumen *
A model for the description of atomic and magnetic ordering in Ni-Mn-Al shape memory alloys is presented. The parameters characterizing the energies of the chemical and magnetic interactions were obtained from fitting to experimental data. Monte Carlo simulations based on this model correctly reproduces the critical ordering temperatures as a function of composition for three pseudobinary composition lines, as well as the nature of the low temperature magnetic transition. A ferromagnetic configuration is predicted for alloys in the stable structure, whereas an antiferromagnetic state is obtained for metastably retained order; this is in agreement with experimental observations. It is verified that atomic ordering is strongly dominated by the interactions between Ni and Al atoms in nearest neighbours. As a consequence, the formation of order can delay the stabilization of the configuration at low temperatures. Since the magnetic interactions change sign with the Mn–Mn distance, the type of stable magnetic configuration depends on atomic ordering. Información suministrada por el agente en SIGEVAPalabras Clave
MAGNETISMMONTE CARLO SIMULATIONSMAGNETIC SHAPE MEMORY ALLOYORDER-DISORDER