Method for evaluating microcrack initiation of magnesium alloy

A micro-crack, magnesium alloy technology, applied in the field of testing, can solve the problem of not considering the grain orientation around the grain boundary, and achieve the effect of improving the shape

Active Publication Date: 2016-03-09
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0004] At present, for the generation of microcracks in magnesium alloy materials and the failures caused by them, the existing research methods include using ion beam grid (FIB) for the deformation area, and analyzing the effect of local strain on microcracks by dr

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  • Method for evaluating microcrack initiation of magnesium alloy
  • Method for evaluating microcrack initiation of magnesium alloy
  • Method for evaluating microcrack initiation of magnesium alloy

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[0035] The embodiments of the present invention will be described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention. Detailed implementation modes and specific operation procedures are given, but the protection scope of the present invention is not limited to the following implementations. example.

[0036] Combine Figure 1-Figure 3 , A detailed description of the method of the present invention for evaluating the initiation of magnesium alloy microcracks, such as figure 1 Shown as its flowchart, which includes the following steps:

[0037] S11: Use the in-situ stretching method to obtain in-situ scanning electron microscopy (SEM) and in-situ electron backscatter diffraction (EBSD) data;

[0038] S12: Obtain the Euler angle representing the orientation information of the crystal grains based on the in-situ scanning electron microscope (SEM) and in-situ electron backscatter diffraction (EBSD) data through OIM software;...

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Abstract

The invention discloses a method for evaluating microcrack initiation of magnesium alloy. The method includes the following steps that an in-situ tension method is adopted for acquiring the data of an in-situ scanning electron microscope (SEM) and the data of in-situ electron back scattering diffraction (EBSD); according to the data of the in-situ SEM and the data of the in-situ EBSD, the eulerian angles representing grain orientation information are acquired; in accordance with the eulerian angles, the crack initiation parameter F1 is calculated, and the possible microcrack initiation position is predicted. According to the method for evaluating the microcrack initiation of the magnesium alloy, the in-situ EBSD method is adopted so that slipping and twinning information in grains and microcrack initiation in the uniaxial drawing process of the magnesium alloy can be observed dynamically; the correlation between microcrack initiation on the grain boundary and the orientation and stress direction of surrounding grains can be evaluated comprehensively through calculation of the crack initiation parameter F1; the nucleation and the happening position of microcracks can be accurately predicted through calculation of the F1 value, and it is of great significance to improve the plasticity of the magnesium alloy.

Description

Technical field [0001] The invention relates to the technical field of testing, in particular to a method for evaluating the initiation of microcracks in magnesium alloys. Background technique [0002] At present, among various failures of metal materials, fracture failure is the most important and the most harmful. The crack is the prelude to fracture failure. Therefore, predicting the initiation position of microcracks is of great significance for fracture failure caused by cracks. [0003] There are two different methods for existing research on fracture behavior. One is the method of fracture mechanics, which is based on the elasticity and elastoplastic theory of metals, and considers the existence of defects in the material to establish a method of studying fracture behavior. The other is the method of metal physics, which studies the fracture behavior from the microstructure of the material, the micro defect, and even the molecular and atomic scale. The research methods o...

Claims

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Application Information

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IPC IPC(8): G01N23/203G01N1/32
CPCG01N1/32G01N23/203
Inventor 靳丽刘璁慧董杰章桢彦王锋华
Owner SHANGHAI JIAO TONG UNIV
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