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A detection method for microscopic residual stress of metal matrix composites

A composite material and residual stress technology, which is applied in the direction of analyzing materials, using wave/particle radiation for material analysis, measuring devices, etc., can solve the problems that cannot meet the requirements of residual stress detection, etc.

Active Publication Date: 2017-06-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the defect that the existing stress characterization technology cannot meet the residual stress detection requirements of metal matrix composites and other materials with complex structures, the purpose of the present invention is to provide a method for characterization of the microscopic residual stress of metal matrix composites. The method is based on the EBSD theory Based on this method, the relationship between EBSD parameters and residual stress is established, so that through the data processing of EBSD parameters, the microscopic residual stress distribution of metal matrix composites can be quantitatively characterized.

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  • A detection method for microscopic residual stress of metal matrix composites
  • A detection method for microscopic residual stress of metal matrix composites
  • A detection method for microscopic residual stress of metal matrix composites

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Embodiment 1

[0066] The detection material is a three-dimensional network reinforced SiC3D / Al metal matrix composite material. The detection process is as follows: use a thermal field emission electron microscope, cooperate with the EBSD system, select the SiC / Al interface for the detection area, and deduce the in-situ misorientation within the range of 0.5° to 5° Distribution data; such as figure 1 shown. Select the direction perpendicular to the SiC / Al interface as the detection direction, that is, the X-axis direction, and divide the sub-regions. The width of the sub-regions is 1 μm.

[0067] For each sub-region, the values ​​of all detection points on the X axis are characterized by a unique X value, and the values ​​of all detection points on the X axis are averaged to obtain a unique X value;

[0068] The in-situ misorientation distribution data of each sub-region is expressed as (f i , i), i is the in-situ orientation difference value of any detection point in the sub-region, and ...

Embodiment 2

[0072] The detection material is a particle-reinforced SiCp / Cu metal matrix composite material. The detection process is as follows: use a cold field emission electron microscope, cooperate with the EBSD system, select the SiC / Al interface for the detection area, and derive the in-situ misorientation distribution data within the range of 0.5° to 5° ;Such as Figure 4 shown. Select the direction perpendicular to the SiC / Cu interface as the detection direction, that is, the X-axis direction, and divide the sub-regions. The width of the sub-regions is 1 μm.

[0073] For each sub-region, the values ​​of all detection points on the X axis are characterized by a unique X value, and the values ​​of all detection points on the X axis are averaged to obtain a unique X value;

[0074] The in-situ misorientation distribution data of each sub-region is expressed as (f i , i), i is the in-situ orientation difference value of any detection point in the sub-region, and i takes 0.5°~5°; f ...

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Abstract

The invention discloses a method for detecting microscopic residual stress in a metal-matrix composite, and belongs to the technical field of composite microscopic characterization. The method is based on an EBS theory and is combined with a mechanics theory of materials. The method comprises: establishing a relationship between micro-area residual stress and an in-situ orientation difference parameter; acquiring position data, euler angle data, and in-situ orientation difference data of each detected point; establishing an X-Y coordinate system to characterize a distribution function of in-situ orientation differences in a whole detected area; and characterizing a distribution function of residual stress in the whole detected area through a formula of sigma=(cos<theta>-1)E. Microscopic residual stress distribution of the metal-matrix composite is finally quantitatively characterized through treating EBSD parameter data.

Description

technical field [0001] The invention relates to a method for detecting microscopic residual stress of metal matrix composite materials, in particular to a method for characterizing microscopic residual stress of metal matrix composite materials by electron backscattered diffraction (EBSD), which belongs to the microscopic characterization technology of composite materials field. Background technique [0002] Compared with metal materials, metal matrix composites have the characteristics of low density, high specific strength, high specific modulus, low thermal expansion coefficient, etc., so they become ideal base materials for various multi-chip components and high-current power modules, as well as various small, Ideal material for parts with high strength, such as aerospace parts. Due to factors such as differences in thermal expansion coefficients, microscopic residual stresses are formed during the preparation of metal matrix composites, especially the microscopic resid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/203
Inventor 马壮薛辽豫王富耻王扬卫
Owner BEIJING INSTITUTE OF TECHNOLOGYGY