Abstract
High zinc containing Al-Zn-Mg-Cu is the research focus of ultra-high strength aluminum alloy. In the present paper, the Al-Zn-Mg-Cu multi-component system is studied when the content of Zn is 10.5 wt.%, 11 wt.% and 12 wt.%, respectively. The vertical sections of phase diagrams are calculated by the thermodynamic method. The precipitation parameters of the η’ phase, including the density of precipitate, precipitate radius and volume fraction, are obtained by using the methods of kinetic calculations. The yield strength of Al-Zn-Mg-Cu alloy with different content of Zn is calculated by an empirical model containing a chemical element and a microstructure parameter. The calculated results of yield strength are verified by experimental data and provide primary guidance to developing Al-Zn-Mg-Cu ultra-high strength aluminum alloys.
Highlights
Ultra-high strength aluminum alloy, known as 7xxx aluminum alloy, is one of the important structural materials in the aerospace industry [1,2]
The calculated results of yield strength are verified by experimental data and could provide suggestions for the rational design of ultra-high strength aluminum alloys with high Zn content
The CALPHAD (Computer Coupled Phase Diagram and Thermochemistry) technique aims to promote thermodynamics calculation by developing models representing the thermodynamic properties of alloy phases [9,10]
Summary
Ultra-high strength aluminum alloy, known as 7xxx aluminum alloy, is one of the important structural materials in the aerospace industry [1,2]. It is the highest strength of various deformed aluminum alloys that has successfully realized commercial application. Mg and Cu are the main alloying elements of ultra-high strength aluminum alloy [3,4]. In order to meet the higher strength requirements of aerospace materials, new Al-Zn-Mg-Cu systems of ultra-high strength aluminum alloy have been developed, such as 7037 alloy, 7056 alloy, 7097 alloy and 7095 alloy. Zn is the main element of precipitate strengthening in ultra-high strength aluminum alloys [5,6]
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