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Phase field simulation method for co-evolution of defects and nanophases under irradiation

A technology for phase field simulation and irradiation defects, applied in design optimization/simulation, instrumentation, reduction of greenhouse gases, etc., can solve the problem of not being able to simultaneously study defects and nanometer equivalence

Active Publication Date: 2020-11-06
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] The technical problem solved by the present invention is to provide a phase field simulation method for the co-evolution of irradiation defects and nanophases, and solve the problem that existing research methods cannot study defects and nanophases at the same time

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  • Phase field simulation method for co-evolution of defects and nanophases under irradiation
  • Phase field simulation method for co-evolution of defects and nanophases under irradiation

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Embodiment Construction

[0037] In order to illustrate the specific implementation manner of the present invention more clearly, it will be further described through specific embodiments in the accompanying drawings.

[0038] The invention is a phase field simulation method for co-evolution of irradiation defects and nano phases, the steps of which are as follows:

[0039] (1) Thermodynamic description of defects and nanophase systems using alloy thermodynamic free energy;

[0040] (2) According to the thermodynamic description, solve the chemical free energy and elastic energy of defects and nanophase systems under irradiation;

[0041] (3) Based on the Chan-Hilliard diffusion equation, establish the phase field dynamics equation for the evolution of defects and nanophases under irradiation;

[0042] (4) According to the input variables, the structure morphology and composition evolution of defects and nanophases under different irradiation conditions were simulated, and the influence of defects on ...

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Abstract

The invention relates to a phase field simulation method for co-evolution of defects and nanophases under irradiation. The phase field simulation method comprises the following steps: characterizing the evolution of a system by using the thermodynamic free energy of an alloy; establishing total free energy of a defect-alloy system under irradiation; establishing a phase field equation for co-evolution of defects and nanophases under irradiation, and realizing simulation and representation of evolution of alloy defects and nano-phases under irradiation; analyzing the changes of the microstructure morphology of the defects and the nanophases under the condition that an irradiation temperature and a defect concentration change so as to obtain the evolution rules of the defects and precipitated nanophases under irradiation; and analyzing the volume fraction changes of the defects and the nanophases to obtain the influence rules of different irradiation temperatures and defect concentrations on the formation and evolution dynamics of the defects and the nanophases. The invention provides the phase field simulation method for co-evolution of the defects and the nanophases under irradiation, so an interaction relationship between the defects and phase decomposition under irradiation can be obtained, and guidance is provided for the design and service safety of alloy materials under irradiation.

Description

technical field [0001] The invention relates to the technical field of microstructure control of metal materials under irradiation, in particular to a phase field simulation method for co-evolution of irradiation defects and nano phases. Background technique [0002] In the nuclear field, under the high temperature and irradiation of nuclear reactor structural materials, the atoms in the alloy will leave the original lattice positions to form vacancies and interstitial atoms. The existence of defects promotes the precipitation of nanophases, hinders the movement of dislocations and causes alloy brittleness. The increase in hardness leads to a decrease in the service life of the material. Therefore, it is particularly important to study the evolution of defects and nanophases under irradiation for the safe use of alloys. [0003] From the current research, it can be seen that the main factors affecting the phase transformation of the alloy by irradiation are the irradiation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C60/00G06F30/20G06F17/11G06F119/08G06F119/14
CPCG16C60/00G06F30/20G06F17/11G06F2119/08G06F2119/14Y02E60/00
Inventor 李永胜严正伟
Owner NANJING UNIV OF SCI & TECH
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