Based On Monte Carlo Simulation About The Magnetic Disordered Alloys

It refers to the phase change material system transition from one state to another state in the process. On the phase transition, the ferromagnetic phase transition is an area where people are interested in. At low temperatures, the ferromagnetic spin is ordered because of their interaction.However, when the temperature exceeds the Curie temperature, the ordered spin becomes disorderly.At the moment, the ferromagnetic turns to the paramagnetic.With the development of computer technology, the Ising model has become an effective method to study the ferromagnetic phase transition. In this paper, the research object is the binary Fe-Al alloy, and the Fe-Al binary alloy phase transformation is studied by Ising model. It understands the essence of the principle of binary alloy ferromagnetic phase transition from the microscopic point of view. The main contents and results are as follows:(1) It analyzes the phase transition classical two-dimensional Ising model and three-dimensional Ising model by Monte Carlo method. Compared with the exact value or the relevant literature,the results show that the numerical simulation method is effective.(2) It analyzes the relation that Al content of ordered Fe-Al(Al at 25%-45%) and the Curie point:With the increment of Al content, D03 type structure turns to B2 type structure;ferromagnetic-paramagnetic phase transition point has been smaller until it disappears. The phase transition point disappears due to Al content of about 39%.(3) It analyzes the relation of disordered Fe-Al(Al at0%-70%) and the Curie point: With the increment of Al content, the ferromagnetic-paramagnetic phase transition point is gradually reduced until it disappears at Al content of 60%.(4) It analyzes the relation between order and disorder Fe-Al Alloys: With the increment of dislocation Al atoms, Fe3 Al currie point ncreased compared with the order phase. For Fe Al, the ferromagnetic transition point occurs at Al content of 50%.(5) It analyzes the effect of the next nearest interaction on Fe-Al alloys: Compared with the nearest neighbors on three-dimensional, the next nearest neighbor interaction increased ferromagnetic transition point.