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Method for optimizing chemical components of Al-Zn-Mg-Cu aluminum alloy

A chemical composition, aluminum alloy technology, applied in the field of alloys, can solve the problems of low quenching sensitivity, small solidification shrinkage tendency, no comprehensive consideration of alloy yield strength, quenching sensitivity and solidification shrinkage tendency, etc., to achieve low quenching sensitivity , The effect of small solidification shrinkage tendency and high yield strength

Pending Publication Date: 2021-10-22
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0004] The present invention provides a method for optimizing the chemical composition of an Al-Zn-Mg-Cu aluminum alloy, aiming at the problem that the existing alloy composition optimization method does not comprehensively consider the properties of the alloy such as yield strength, quenching sensitivity, and solidification shrinkage tendency. The method can comprehensively consider the different weights of yield strength, quenching sensitivity, solid phase fraction and molar volume thermal properties, and optimize the chemical composition of Al-Zn-Mg-Cu aluminum alloy with high strength, low quenching sensitivity and small solidification shrinkage tendency

Method used

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  • Method for optimizing chemical components of Al-Zn-Mg-Cu aluminum alloy
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  • Method for optimizing chemical components of Al-Zn-Mg-Cu aluminum alloy

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Embodiment 1

[0036] Example 1: A method for optimizing the chemical composition of an Al-Zn-Mg-Cu aluminum alloy, the specific steps are as follows:

[0037] (1) A full factorial design experiment was carried out on the three alloying elements of Zn, Mg and Cu of the Al-Zn-Mg-Cu aluminum alloy, and 27 alloy compositions were obtained (see Table 1);

[0038] Table 1 Alloy Composition Table

[0039]

[0040] (2) Calculate the yield strength of the 27 alloy compositions obtained in step (1) by using JMatPro thermodynamic software to calculate the yield strength after T6 aging in the MechanicalProperties module, where the alloy state is forged, the solution treatment temperature is 475°C, and the aging temperature is 120°C , The grain size is 80um; secondly, JMatPro thermodynamic software is used to calculate the TTT curve of the Phasetransformation module, in which only the TTT curve calculation of the η' phase is performed, and the starting temperature is 475°C; finally, the JMatPro therm...

Embodiment 2

[0056] Embodiment 2: A method for optimizing the chemical composition of an Al-Zn-Mg-Cu aluminum alloy, the specific steps are as follows:

[0057] (1) The four alloying elements Zr, Zn, Mg and Cu of the Al-Zn-Mg-Cu aluminum alloy were subjected to a full factorial design experiment, and 81 alloy compositions were obtained (see Table 2);

[0058] Table 2 Alloy Composition Table

[0059]

[0060] (2) Calculate the yield strength of the 81-group alloy composition obtained in step (1) by using JMatPro thermodynamic software to calculate the yield strength after T6 aging in the MechanicalProperties module, where the alloy state is forged, the solution treatment temperature is 470°C, and the aging temperature is 115°C , the grain size is 45um; secondly, the JMatPro thermodynamic software is used to calculate the TTT curve of the Phasetransformation module, in which only the TTT curve of the η' phase is calculated, and the starting temperature is 500°C; finally, the JMatPro therm...

Embodiment 3

[0076] Embodiment 3: A method for optimizing the chemical composition of an Al-Zn-Mg-Cu aluminum alloy, the specific steps are as follows:

[0077] (1) A full factorial design experiment was carried out on the six alloying elements of Zr, Zn, Mg, Cu, Fe and Si of the Al-Zn-Mg-Cu aluminum alloy, and 729 alloy compositions were obtained (see Table 3);

[0078] Table 3 Alloy Composition Table

[0079]

[0080] (2) The 729 alloy composition obtained in step (1) is first calculated by using JMatPro thermodynamic software to calculate the yield strength after T6 aging in the Mechanical Properties module, where the alloy state is forged, the solution treatment temperature is 475°C, and the aging temperature is 125°C ℃, the grain size is 150um; secondly, JMatPro thermodynamic software is used to calculate the TTT curve of the Phase transformation module, in which only the TTT curve calculation of the η′ phase is performed, and the starting temperature is 500℃; finally, the JMatPro ...

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Abstract

The invention relates to a method for optimizing chemical components of an Al-Zn-Mg-Cu aluminum alloy, and belongs to the technical field of alloys. The method comprises the following steps: carrying out a full-factor design test on a plurality of alloy elements of the Al-Zn-Mg-Cu aluminum alloy to obtain a plurality of alloy components; adopting JMatPro thermodynamic calculation software for calculation of the mechanical performance of a mechanical Properties module, calculation of a TTT curve of a Phase Transformation module and calculation of the solid-phase fraction and the molar volume of a Solidification module, and exporting the data and graphs of calculation results; performing variance analysis and regression modeling processing on the data of the calculation result; comprehensively analyzing different weight factors and regression equations of the established yield strength, quenching sensitive characteristic, solid phase fraction and molar volume; and adjusting the value of each alloy element according to the regression equation and the weight factor, and optimizing the chemical components of the Al-Zn-Mg-Cu aluminum alloy to obtain the chemical components of the Al-Zn-Mg-Cu aluminum alloy with high strength, low quenching sensitive characteristic and small solidification shrinkage tendency.

Description

technical field [0001] The invention relates to a method for optimizing the chemical composition of an Al-Zn-Mg-Cu aluminum alloy, belonging to the technical field of alloys. Background technique [0002] Al-Zn-Mg-Cu alloy is a high-strength and high-toughness aluminum alloy, which is currently widely used in aerospace, rail transit, and civil industries. With the continuous development of aerospace and rail transportation, the integration and enlargement of load-bearing components are required, and higher requirements are put forward for the comprehensive performance of Al-Zn-Mg-Cu alloy. [0003] At present, the traditional method of research and development of new materials is mainly through continuous smelting small-scale experiments and trial and error, requiring R&D personnel to have rich theoretical knowledge and work experience. The traditional method has the disadvantages of long R&D cycle and high cost, such as the R&D of 7085 aluminum alloy. However, thermodynami...

Claims

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Application Information

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IPC IPC(8): G16C20/30G16C20/90G16C10/00C22C21/10
CPCG16C20/30G16C20/90G16C10/00C22C21/10
Inventor 黄仁松郑善举李萌蘖
Owner KUNMING UNIV OF SCI & TECH
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