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Ni3Al-based alloy constitutive model establishment method based on representative volume elements

A constitutive model and volume element technology, applied in the field of aerospace materials, can solve the problems that are far apart, difficult to effectively describe the mechanical properties of materials, and cannot include material microscopic uncertainties, so as to achieve the effect of effective mechanical response

Inactive Publication Date: 2017-07-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

from Figure 4 It can be seen that the size and shape of the strengthening phases are not exactly the same, and the strengthening phases are not completely ordered in the matrix phase, and its internal structure is full of uncertainties, although the unit cell reflects the The characteristics of the material microstructure, but it describes more the ideal average microstructure characteristics of the material, which is far from the actual microstructure of the material, and cannot include the microscopic uncertainty of the material, so it is difficult to effectively describe the mechanical properties inside the material

Method used

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  • Ni3Al-based alloy constitutive model establishment method based on representative volume elements
  • Ni3Al-based alloy constitutive model establishment method based on representative volume elements
  • Ni3Al-based alloy constitutive model establishment method based on representative volume elements

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Embodiment

[0044] A representative volume element (RVE) based Ni 3 Al base alloy constitutive model establishment method, comprises the steps:

[0045] 1), generate the microscopic representative volume element (RVE) of the material according to the microstructure of the material through an effective method. In the RVE, both the strengthening phase and the matrix phase adopt a viscoplastic model.

[0046] 2), for Ni 3 Tensile test of Al single crystal to obtain the elastic constant C of the strengthening phase 11 、C 12 and C 44 .

[0047]3), the elastic constant C of matrix phase is obtained by nanoindentation test on pure Ni 11 、C 12 and C 44 .

[0048] 4), for Ni 3 The Al-based alloy IC10 was subjected to tensile tests under different strain loads, sliced ​​the stretched specimens, and observed the dislocation distribution inside the material through a transmission electron microscope (TEM); and used image processing software to count the dislocations of the materials under di...

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Abstract

The invention discloses a Ni3Al-based alloy constitutive model establishment method based on representative volume elements. The method comprises the steps that (1) the representative volume elements (RVEs) used for analysis are constructed; (2) a constitutive model of a material is established based on a crystal plasticity theory, and parameters of the model are acquired through a test; (3) a constitutive model of a Ni3Al-based alloy based on the RVEs is established; and (4) the model is verified, wherein after the model is established, the tensile properties of the Ni3Al-based alloy IC10 at the temperature of 600 DEG C are subjected to simulated verification. The method has the advantages that the mechanical response of the material under a load can be predicted more effectively, and the method has a certain theoretical value and engineering significance.

Description

technical field [0001] The invention belongs to the technical field of aviation materials, in particular to a Ni 3 Al-based alloy constitutive model establishment method. Background technique [0002] studying Ni 3 When the γ′ / γ structure inside the Al-based alloy is studied, researchers usually study it in the form of a unit cell, but in fact the distribution of the strengthening phase γ′ phase inside the material is not completely ordered, and the analysis using the unit cell The influence of the inhomogeneity of the strengthening phase distribution on the material properties is neglected. Figure 4 The relationship between the unit cell and RVE and microstructure is given, where Figure 4 (a) a test piece for a tensile test, Figure 4 (b) For the microstructure diagram of IC10 alloy taken by scanning electron microscope (SEM), select a region containing enough strengthening phases in the microstructure, and this region containing enough microscopic information is the rep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F2111/20G06F2119/06G06F2119/18
Inventor 张宏建李鑫温卫东崔海涛徐颖
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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