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Method for determining eutectic point components in multi-element alloy phase diagram

A technology for multi-element alloys and determination methods, which is applied in the field of alloy materials and can solve the problems of inability to calculate the composition of eutectic points, taking a lot of time, and a lot of experiments.

Pending Publication Date: 2021-06-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the experiment, when the position of the eutectic point in the phase diagram is determined by the current method of continuous approximation, a large number of experiments and a lot of time are required, and one experiment cannot be used to directly obtain the eutectic of binary, especially multi-component alloys with more than binary elements. point
When the existing thermodynamic data is used to calculate the composition of the eutectic point, experiments are often required for further verification, and when there is a lack of relevant thermodynamic data, it is impossible to calculate the co-crystal point of the binary or multi-system phase diagram by thermodynamic methods or thermodynamic software. Crystal point composition

Method used

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  • Method for determining eutectic point components in multi-element alloy phase diagram
  • Method for determining eutectic point components in multi-element alloy phase diagram
  • Method for determining eutectic point components in multi-element alloy phase diagram

Examples

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Effect test

Embodiment 1

[0025] Example 1: A method for determining the composition of the eutectic point in the phase diagram of a multi-element alloy (see figure 1 ),Specific steps are as follows:

[0026] (1) Mix high-purity iron (99.95%), high-purity silicon (99.9999%) and high-purity aluminum (99.999%) evenly, place the mixture in an electromagnetic induction furnace with a directional crystallization device, and place it in a protective gas atmosphere ( Induction heating in argon gas) to complete melting and holding for 1h to obtain a multi-component alloy melt; the molar ratio of iron, silicon and aluminum is 4:42:54;

[0027] (2) performing directional crystallization of the multi-component alloy melt in step (1) under electromagnetic induction heating to obtain a crystal phase and a multi-component eutectic alloy; wherein the directional crystallization is to move the multi-component alloy melt directionally out of the heating zone at a speed of 1 μm / s, and the multi-component alloy melt is d...

Embodiment 2

[0030] Example 2: A method for determining the composition of the eutectic point in a multi-element alloy phase diagram (see figure 1 ),Specific steps are as follows:

[0031] (1) Mix high-purity titanium (99.9%), high-purity silicon (99.9999%) and high-purity aluminum (99.999%) evenly, place the mixture in an electromagnetic induction furnace with a directional crystallization device, and place it in a protective gas Induction heating in the atmosphere (helium) to complete melting and holding for 0.5h to obtain a multi-component alloy melt; the molar ratio of titanium, silicon and aluminum is 5:50:45;

[0032] (2) performing directional crystallization of the multi-element alloy melt in step (1) under electromagnetic induction heating to obtain a crystal phase and a multi-element eutectic alloy; wherein the directional crystallization is to move the multi-element alloy melt directionally out of the heating zone at a speed of 4 μm / s, and the multi-element eutectic alloy Si an...

Embodiment 3

[0035] Example 3: A method for determining the composition of the eutectic point in the phase diagram of a multi-element alloy (see figure 1 ),Specific steps are as follows:

[0036] (1) Mix high-purity iron (99.95%), high-purity manganese (99.8%), high-purity silicon (99.9999%) and high-purity aluminum (99.999%) evenly, and place the mixture in an electromagnetic induction furnace with a directional crystallization device , and induction heating in a protective gas atmosphere (argon) to complete melting and holding for 0.5h to obtain a multi-component alloy melt; the molar ratio of titanium, manganese, silicon and aluminum is 3.85:3.85:40.38:51.92;

[0037] (2) performing directional crystallization of the multi-element alloy melt in step (1) under electromagnetic induction heating to obtain a crystal phase and a multi-element eutectic alloy; wherein the directional crystallization is to orient the induction heating coil upward and away from the multi-element alloy melt at a ...

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Abstract

The invention relates to a method for determining eutectic point components in a multi-element alloy phase diagram, and belongs to the technical field of alloy materials. The method comprises the steps of uniformly mixing materials of two or more high-purity alloy elements, heating in a protective gas atmosphere until the materials are completely molten to obtain a multi-element alloy melt, and directionally crystallizing the multi-element alloy melt to obtain a crystal phase and a multi-element eutectic alloy; and cutting and separating the crystal phase and the multi-element eutectic alloy to obtain the multi-element eutectic alloy material, and analyzing the components of the multi-element eutectic alloy material, namely the eutectic point components in the multi-element alloy phase diagram. According to the method, the proportion of materials of high-purity alloy elements does not need to be controlled, the multi-element eutectic alloy or the eutectic high-entropy alloy is designed without relying on thermodynamic data, and the eutectic point components in the multi-element alloy phase diagram are directly determined without relying on thermodynamic data.

Description

technical field [0001] The invention relates to a method for determining the eutectic point composition of a multi-element alloy phase diagram, and belongs to the technical field of alloy materials. Background technique [0002] The melting point of the eutectic alloy is lower than that of the pure main material, so the eutectic alloy has better fluidity at the same temperature, which can simplify the operation of melting and material casting, and also effectively prevent the formation of dendrites during the solidification process. flow to improve casting properties. At the same time, the solidification process of the eutectic alloy is a constant temperature transformation, which helps to reduce casting defects such as segregation and shrinkage cavities; in addition, the eutectic reaction occurs when the eutectic alloy solidifies, and various forms of microstructures can be obtained, such as being arranged as layers Sheet-like or rod-like structure, so it has the potential...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/06C22C1/02C22C30/00
CPCG01N25/06C22C1/02C22C30/00
Inventor 雷云何勇马文会雷敏鹏张日林
Owner KUNMING UNIV OF SCI & TECH
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