Three-dimensional graphical representation method for dislocation characteristics

Abstract

The invention discloses a three-dimensional graphical representation method for dislocation characteristics. The method comprises the following steps: acquiring images of dislocation in a sample at different angles through a transmission electron microscope, performing three-dimensional reconstruction to obtain a three-dimensional image of the dislocation described in a crystal coordinate system, acquiring a line direction of the dislocation according to the three-dimensional image of the dislocation, then acquiring component information of the dislocation according to the line direction of the dislocation and the Burkholtz vector of the dislocation, acquiring a spatial relationship between the dislocation and a preset crystal face according to the line direction of the dislocation, and displaying spatial distribution of the component information of the dislocation and the spatial relationship between the dislocation and the preset crystal face in a three-dimensional image of the dislocation. According to the method, the dislocation characteristics are represented in the three-dimensional image of the dislocation, the two kinds of dislocation characteristics can be represented accurately and visually, and a technical basis is provided for research on dislocation-related basic scientific problems.

Description

technical field [0001] The invention relates to the technical field of crystal analysis and characterization, in particular to a three-dimensional graphical representation method of dislocation features. Background technique [0002] Dislocations are important defects in crystal materials, and their spatial configuration and dynamic evolution behavior have a profound impact on the mechanical and physical and chemical properties of materials. Generally, dislocations can be divided into three types: edge type, screw type and mixed type, which respectively exhibit different migration evolution capabilities and behaviors under the action of external fields. For example, edge dislocations are prone to slip and climb, screw dislocations are prone to slip and cross-slip, and the migration behavior of mixed dislocations is more complicated, mainly related to the content of the edge-screw dislocation components that constitute the dislocation. related to the distribution. [0003] ...

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Problems solved by technology

For example, under heating conditions, edge dislocations locally absorb vacancies and climb to form scissors. Because the scissors where the scissors are located are different from the initial slip plane of the dislocation, an immovable node is formed, which affects the continuous migration of the dislocation as a whole. capacity; under stress conditions, due to the uneven distribution of solute elements, particles and other obstacles, dislocations locally arch out to form bending dislocations, or cross-slip to other slip surfaces to form slip system switching, which significantly affects macroscopic deformation behavior

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