Study On Microstructure And Properties Of Fe-based Amorphous Alloys

Due to great soft magnetic properties and corrosion resistance,iron-based amorphous alloy is concerned by a lot of researchers.At present,many researchers improve the properties of iron-amorphous alloy by adjusting the composition and changing heat treatment process.But a great number of researchers are still engaged in the study of structure and mechanism.They want to control performance better by understanding the mechanism deeply.Property depends on structure.recently,a lot evidences have identified that nanoscale-microstructure heterogeneity in amorphous alloy.And there is a correlation between the microstructures and relaxation.In this paper,microstructure of iron-based amorphous alloy is tested by amorphous alloy's the intrinsic characteristics of viscoelasticity.And at same time,the relationship between properties and microstructures is established to guide the development of new amorphous alloy.This paper mainly adjusts the cooling rate and composition to control the iron-based amorphous alloy.Cooling rate influences on the atomic arrangement of amorphous alloy and properties.Iron-based amorphous alloy made by different speed test performance and structure.Due to increasing cooling rate,the binding energy of iron increases.Electrons in circular orbits around the nucleus and spin around themselves produce eddies of electromagnetic ether and form magnetism.With the increase of cooling rate,the binding energy of magnetic elements increases,which makes it difficult for electrons to move.And with the energy state of amorphous alloy increasing,the liquild-zone increases and the heterogeneity of structure decreases.With the liquid-like region,the pinning effect increases,and the movement of domain walls is difficult.So with the increase of cooling rate,the coercivity doesn't change,but the effective permeability and the corrosion resistance decrease.With the addition of Nb and Cu elements,the crystallization peaks of iron-based amorphous alloy are separated,the morphology fluctuation decreases,the cycle fluctuationincreases,the energy dissipation of amorphous alloys increases,and the fluctuation of energy dissipation decreases.the cooling rate also effect on the correlation length of phase.when the cooling rate increases,the correlation length of phase increases and the fluctuation of the length decreases.it makes the liquid-like zone of iron-based amorphous alloy increase.All of these promote the transformation from amorphous alloy to nanocrystallization.A lot of instruments have been used to test the properties and structure of iron-based amorphous alloy.And the effect of cooling rate and adding component on iron-based amorphous alloy have been generally understood generally.The different of cooling rate and the addition of elements will make atomic arrangement different and affect the performance.It also shows that it is possible to control the microstructure for performance.