Method for determining polycrystalline metal deformation activation slippage system

Abstract

The invention provides a method for determining a polycrystalline metal deformation activation slippage system and belongs to the field of analysis of a material mechanical property. The method comprises the following steps: carrying out crystal orientation analysis on the surface of a test sample by adopting an EBSD analyzer; analyzing a loaded slippage band appearance by adopting a laser co-focusing microscope; calculating an included angle between a slippage band and a loading stress axis and comparing with an actual measurement value to determine a slippage surface; calculating a Schmid factor of a possible slippage system corresponding to the slippage surface; and determining a slippage direction according to a Schmid principle. Existing analysis methods mainly comprise five methods including an accrual method, a diagrammatizing method, a tensile axis index observation method, an X-ray diffraction method and a transmission electron microscope method. The first three methods are used for speculating a theoretical slippage system, and cannot be used for determining an actual activation slippage system; and the last two methods cannot be used for analyzing crystal orientation and damage appearance at the same time. The method can be used for analyzing the orientation of grain crystals and the corresponding slippage band appearance, and is relatively suitable for activation slippage system analysis after polycrystalline metal mechanical deformation.

Description

technical field [0001] The invention relates to a method for determining the deformation-activated slip system of polycrystalline metal, which belongs to the field of material mechanical property analysis. Background technique [0002] Once the slip surface of polycrystalline metal slips along the slip direction under the action of external load, it will interact with the free surface of the sample to form a slip zone. At this time, the corresponding slip system is considered to be activated, and the corresponding slip The plane and slip directions are denoted by facet index and orientation index, respectively. Determining the slip system is of great significance for elucidating the mechanical deformation mechanism of materials and evaluating the service performance of materials. [0003] How to accurately determine the active slip system is a major problem in the analysis of material mechanics. Relevant researchers have successively reported five methods including accumul...

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Problems solved by technology

Among them, the first three are based on the estimation of the theoretical slip system based on the size of the Schmid factor, and the actual slip system cannot be determined; the orientation information obtained by the X-ray diffraction method is inconvenient to correspond to the grain position and damage morphology. For the orientation analysis of single crystal materials; the transmission electron microscopy method needs to destroy the sample during the sample preparation process, and can only obtain the orientation information of limited micro-regions, and it is almost impossible to analyze the crystal orientation and damage morphology in the area range

In this case, it becomes very difficult to accurately determine the deformation-activated slip system of polycrystalline metal materials

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