Method for determining liquid phase nucleation interval during directional solidification, standing and thermal stabilization of peritectic alloy
A directional solidification, thermally stable technology, applied in instrumentation, chemical process analysis/design, chemical statistics, etc., can solve problems such as nucleation mechanism and liquid phase migration process that have not been fully studied
Active Publication Date: 2020-09-15
LANZHOU UNIVERSITY
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However, the nucleation mechanism and liquid-phase migration process at this interface have not been fully investigated
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[0142] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0143] The static thermal stabilization process before the start of directional solidification has an important impact on the subsequent directional solidification, because the static thermal stabilization process directly determines the liquid phase composition at the start of the subsequent directional solidification, thereby affecting the morphology and properties of the subsequent solidification structure. The composition of the liquid phase at the start of the subsequent directional solidification is mainly determined by the nucleation and migration of the liquid phase during the static thermal stabilization process. Liquid phase nucleation during static thermal stabilization is thought to occur previously within solid phase grains in the mushy region formed by static thermal stabilization. However, the...
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The invention discloses a method for determining a liquid phase nucleation interval during directional solidification, standing and thermal stabilization of peritectic alloy. Due to the fact that liquid phase is subjected to the external temperature gradient effect after nucleation, a melting / solidification process caused by solute diffusion occurs in a pasty area at the same time, and the liquidphase migrates to the high-temperature part of the pasty area through the process and finally enters a liquid phase area. The liquid phases respectively migrating from the same nucleation position canleave migration traces in the pasty area. Therefore, the migration time interval after nucleation at the solid / solid interface of the liquid phase from the primary phase / peritectic phase is characterized and determined by analyzing the migration trace after nucleation at the solid / solid interface of the liquid phase from the primary phase / peritectic phase. Migration after liquid phase nucleationcan be divided into different stages, and the liquid phase migration speeds in all the stages are different. By means of the method, the liquid phase nucleation interval during peritectic alloy directional solidification standing thermal stability can be accurately determined.
Description
technical field [0001] The invention belongs to the technical field of directional solidification of peritectic alloy materials, and relates to a method for determining the liquid phase nucleation interval when the peritectic alloy is directional solidified and thermally stable. Background technique [0002] In order to obtain the required performance, the growth of many metal materials including peritectic alloys uses directional solidification technology. Directional solidification consists of a static thermal stabilization phase followed by a directional growth phase. During static thermal stabilization, the sample is heated to melt and then held stationary under an applied temperature gradient. Due to the applied temperature gradient, the sample is divided into different regions, which correspond to different cooling ranges during the static thermal stabilization process. Because the concentration gradient is formed in the liquid phase, under the effect of temperature ...
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Login to View More IPC IPC(8): G16C20/10G16C20/70G16C60/00
CPCG16C20/10G16C20/70G16C60/00Y02P10/25
Inventor 彭鹏张安桥岳锦绵张旭东徐远丽马智琨
Owner LANZHOU UNIVERSITY