Rapid Solidification Simulation And Microstructure Analysis Of Soft Magnetic FeCuNi Nanoparticles

As a soft magnetic material,FeCuNi nanoparticles have important application value in the field of electronics and electricity.However,there is no effective physical model to guide the development of FeCuNi nanoparticles with excellent soft magnetic properties.Therefore,research and analysis of the microstructure evolution of FeCuNi nanoparticles and glass formation have far-reaching significance for improving their soft magnetic properties.In this paper,based on the molecular dynamics simulation,using the average atomic energy,coordination number CN,pair distribution function,common neighbour sub-cluster CNS,the largest standard cluster La SC,topologically close-packed(TCP La SC)and 3D visualization technology,microstructure characterization methods are used.The evolution of microstructure of eight sizes of(1000,1200,1500,1800,2000,2200,2500,3000)liquid Fe₇₀Cu₁₅Ni₁₅ nanoparticles during rapid solidification at a cooling rate of 10¹⁰K/s is studied.Microstructure evolution during rapid solidification of liquid Fe₇₀Cu₁₅Ni₁₅ nanoparticles at nine cooling rates(R₁=1×10¹⁴K/s?R₂=1×10¹³K/s?R₃=1×10¹²K/s?R₄=1×10¹¹K/s?R₅=5×10¹⁰K/s?R₆=1×10¹⁰K/s?R₇=5×10⁹K/s?R₈=2×10⁹K/s?R₉=1×10⁹K/s)of 1500 atoms;and the evolution of microstructure during the rapid solidification of seven Fe₇₀Cu_(30-x)Ni_x(x=0,5,10,15,20,25,30)nanoparticles.After research,it is found that Fe₇₀Cu₁₅Ni₁₅ nanoparticles have two crystal phases,one is body-centered cubic(BCC)and the other is topological close-packed crystal phase(TCP).There is no definite relationship between the type of crystal phase and the size and cooling rate,it has a certain degree of randomness.Through the study of Fe₇₀Cu_(30-x)Ni_x nanoparticles,it is found that a phenomenon different from bulk crystals.There is only one crystal structure BCC in Fe₇₀Cu₃₀ nanoparticles,which is mainly due to the distribution of Cu atoms on the surface of the nanoparticles,because of the potential function,the internal Fe atoms only form face-centered cubic structures(FCC);the glass forming ability(GFA)of Fe₇₀Cu_(30-x)Ni_x nanoparticles has no obvious relationship with the fraction of Ni.