Method for determining dislocation core structure based on tensor decomposition and common nearest neighbor

Abstract

The invention discloses a method for determining the dislocation core structure based on tensor decomposition and common nearest neighbor, which belongs to the technical field of dislocation analysis.The method is a dislocation structure analysis method in which a dislocation region is determined by using Nye tensor decomposition with the help of a common neighbor analysis method and the dislocation line and the Bernoulli vector orientation are calculated through singular value decomposition of Nye tensor. Therefore, the analysis and visualization of interface dislocation configuration, dislocation line and Bernoulli vector orientation as well as dislocation core is realized. The dislocation structure, dislocation line and Bernoulli vector orientation can be accurately displayed. A correct dislocation analysis result can be obtained by adjusting the maximum matching angle and reference structure. The interface dislocation structure is expressed from a microstructure. The method playsan irreplaceable role in studying the plastic behavior and dislocation nucleation mechanism of nanocomposites.

Description

technical field [0001] The invention belongs to the technical field of dislocation analysis, and specifically relates to a method for determining dislocation core structures based on tensor decomposition and common neighbors. By using the calculation of Nye tensor and the singular value decomposition of Nye tensor, and with the aid of Common Neighbor Analysis (CNA) method to determine the dislocation area as well as the dislocation line and the corresponding Burgers vector; simultaneous orientation and projection for visualization analyze. Background technique [0002] Interfaces are plane defects in crystals, which have an extremely important impact on the properties and transformations of crystalline materials. For dislocations, on the one hand, the interface can hinder the movement of slip dislocations, and can also decompose and absorb dislocations; on the other hand, the interface can also act as the source of defects such as dislocations, thereby causing interface str...

AI Technical Summary

Problems solved by technology

However, in the process of application, it is found that there are many problems in this method. For example, in the process of Nye tensor calculation, each coordination atom needs to be mapped, and the mapping method will have a decisive impact on the result.

Unreasonable mapping can lead to wrong conclusions, while previous methods did not reasonably address the mapping process

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