Method for determining crystal reciprocity primitive cell basis vector based on EBSD pattern

Abstract

The invention discloses a method for determining a crystal reciprocity primitive cell basis vector based on an EBSD pattern. A pattern center PC and a probe distance DD are utilized for geometrically correcting a chrysanthemum pool zone to obtain a reciprocal vector corresponding to the chrysanthemum pool zone, the component of the reciprocal vector corresponding to the chrysanthemum pool zone in the three-dimensional reciprocal space is determined, and therefore the reciprocal primitive cell basis vector is guided out; by the adoption of the method, false crystal cell information can be effectively removed; on the condition that the width error of the chrysanthemum pool zone is large, the size of the primitive cell is accurately recognized, and the basis vector of the primitive cell is determined.

Description

technical field [0001] The invention relates to the technical field of material microstructure characterization and crystal structure analysis. Specifically, the invention relates to a method for determining crystal reciprocal initial cell base vectors based on EBSD patterns. Background technique [0002] Electron Backscatter Diffraction (EBSD) is an important accessory of Scanning Electron Microscope (SEM), which has been widely used in the analysis of crystal orientation of materials in the past two decades. The diffraction pattern of crystal samples collected on SEM can be realized by using EBSD technology. The EBSD pattern contains extremely rich crystallographic information. Usually, there are dozens of Kikuchi bands on an EBSD pattern. The width of the Kikuchi band is related to the crystal plane spacing. The width and direction of the Kikuchi band can determine the length and direction of the reciprocal vector of the crystal. The Kikuchi bands intersect to form a Kiku...

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Problems solved by technology

For the 3D reconstructed lattice, the selection of the unit cell is not unique, there can be primary cells and non-prime cells, and the primary cells only contain one lattice point. In theory, all primary cells should have the same volume, and the primary cells The base cell is the unit cell with the smallest volume among all unit cells, and the volume of the non-primary cell is an integral multiple of its volume. However, due to the unclear contrast of the Kikuchi band edge of the EBSD pattern, the measurement error of the Kikuchi band width is relatively large. Its measurement error can be as high as 20% (reference: D.J.Dingley and S.I.Wright.Determination of crystal phase from an electron backscatter diffraction pattern.J.Appl.Cryst.42(2009):234-241), at this time the unit cell volume is The phenomenon of continuous change, and more fatally, many spurious unit cell volumes often appear due to the error of the Kikuchi band trace

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