XRD Refined Analysis of Fe-RE System Lattice Constant,Micro Strain and Dislocation Density Characteristics
The Rigaku MiniFlex 600 X-ray diffractometer was used for phase identification and lattice analysis,and the Rietveld structure refinement theory was used to calculate and analyze the characteristics of the Fe-RE system lattice constant,microstrain,and dislocation density.The peak shape function and the least square method are used to obtain the accurate fit-ting pattern of the experimental steel,and by comparing it with the initial structure model of the crystal,the influence of the addition of rare earth on the microstructure of the iron polycrystal is explained from the crystallographic point of view.The re-sults show that after the rare earth is solid-dissolved in the iron base,because the radius of the rare earth atom is larger than that of the iron atom,part of the rare earth atoms enters the iron-based solid solution,which makes the lattice constant of the steel tend to become larger and the lattice density become smaller;After the mechanism diffuses,defects such as vacancies are caused to cause lattice distortion,which increases the micro-strain in the steel.At the same time,the rare earth atoms occup-ying the dislocations will hinder the movement of the dislocations,which will increase the dislocation density in the processing deformation of the steel.
rare earthXRD refinementlattice constantmicro straindislocation density
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