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Phase field analysis method for simulating phase change of [Gamma]-TiAl alloy under non-isothermal condition

A non-isothermal, analytical technology, applied in the field of phase field method, can solve the problem of lack of chemical free energy model, and achieve the effect of avoiding calculation errors, eliminating errors, and stabilizing the calculation system

Active Publication Date: 2019-07-09
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, the current phase field method mainly focuses on the simulation under constant temperature conditions, and does not involve different temperatures and continuous cooling processes, mainly due to the lack of an accurate chemical free energy model

Method used

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  • Phase field analysis method for simulating phase change of [Gamma]-TiAl alloy under non-isothermal condition
  • Phase field analysis method for simulating phase change of [Gamma]-TiAl alloy under non-isothermal condition
  • Phase field analysis method for simulating phase change of [Gamma]-TiAl alloy under non-isothermal condition

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Embodiment

[0040] This example provides a phase field analysis method for simulating the γ-TiAl alloy under non-isothermal conditions. For the TiAl alloy system, where the Al content is 46at.%, the alloy will undergo α in the temperature range from 1300K to 900K. 2 →Ordered phase transition of γ, forming a lamellar structure. This embodiment simulates the evolution process of this phase transition, and the specific implementation is as follows:

[0041] 1. Confirm that the research system is TiAl alloy, and the phase involved is α 2 and γ phase are both intermetallic compounds, and their chemical free energy needs to be represented by the sublattice model (shown in formula (1)). Other related thermodynamic parameters are shown in Table 1.

[0042]

[0043] Table 1

[0044]

[0045]

[0046]

[0047] 2. In order to conveniently, quickly and accurately find the exact value of the above-mentioned atomic occupancy ratio, because the parameters are mutually restricted, the gradi...

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Abstract

The invention belongs to the technical field of phase field methods, and discloses a phase field analysis method for simulating the phase change of a [Gamma]-TiAl alloy under a non-isothermal condition. Through the thermodynamics and dynamics parameters of an alloy system, an initialization condition is determined; according to the crystal structure of an intermetallic compound in the alloy, a sublattice model is used for constructing a chemical free energy model; meanwhile, a gradient descent method is used for calculating a corresponding atomic occupancy ratio; a corrected potential well function is used for coupling of a relationship between the chemical free energy of each phase and a structure field variable [Eta]; meanwhile, elastic energy is added to construct a system free energy function; the constructed function is substituted into a phase field equation; the result values of the structure field variable and an ingredient field variable are calculated; and then, visualizationprocessing is carried out to obtain a corresponding organization evolution diagram, and the results are analyzed. By use of the method, grain evolution processes at different temperatures and tissueevolution rules under different cooling rates can be simulated, and a reference is provided for researching the phase change process of the intermetallic compound.

Description

technical field [0001] The invention belongs to the technical field of phase field methods, and in particular relates to a phase field analysis method for simulating gamma-TiAl alloys under non-isothermal conditions. Background technique [0002] At present, most material research follows the design idea of ​​material composition-microstructure-performance, and the prediction and regulation of material microstructure is an important part of this idea. However, due to the complex shape, structure, and size of the microstructure of materials, it is often necessary to continuously adjust process parameters such as composition, temperature, and time, and conduct a large number of trial and error experiments to obtain materials with ideal organizational structures and physical properties. In order to achieve the goal of "double halving" the material research and development cycle and research and development costs, materials genome engineering was proposed, with the help of compu...

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Application Information

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IPC IPC(8): G01N33/20
CPCG01N33/20
Inventor 王刚王富宝吉丽曾德长
Owner SOUTH CHINA UNIV OF TECH
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