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The Effect of Heat Treatment on Microstructure and Mechanical Properties of Ultra High Strength Aluminum Alloy

Zeng Yu

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Abstract

An Al-9.0Zn-2.5～2.8Mg-2.0～2.4Cu-0.1～0.15Zr-0.2～0.25Ag Ultra high strength aluminum alloy was prepared by low frequency electric-magnetic casting process, The microstructure and mechanical properties of the alloy under different treatment conditions was investigated by tensile properties and hardness test, SEM, TEM observations and XRD analysis. The results show that the peak aging occurred at 120 ℃ for 24 h. Under the peak-ageing condition, the tensile strength, yield strength and elongation of the studied alloy was 730 MPa, 705 MPa and 8.8%, respectively. The main strengthening mechanism of the alloy was precipitation hardening and the strengthening phase was GP zone and η′(MgZn 2).

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What this paper is about

An Al-9.0Zn-2.5～2.8Mg-2.0～2.4Cu-0.1～0.15Zr-0.2～0.25Ag Ultra high strength aluminum alloy was prepared by low frequency electric-magnetic casting process, The microstructure and mechanical properties of the alloy under different treatment conditions was investigated by tensile properties and hardness test, SEM, TEM observations and XRD analysis. The results show that the peak aging occurred at 120 ℃ for 24 h. Under the peak-ageing condition, the tensile strength, yield strength and elongation of the studied alloy was 730 MPa, 705 MPa and 8.8%, respectively. The main strengthening mechanism of the alloy was precipitation hardening and the strengthening phase was GP zone and η′(MgZn 2).

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Available abstract

An Al-9.0Zn-2.5～2.8Mg-2.0～2.4Cu-0.1～0.15Zr-0.2～0.25Ag Ultra high strength aluminum alloy was prepared by low frequency electric-magnetic casting process, The microstructure and mechanical properties of the alloy under different treatment conditions was investigated by tensile properties and hardness test, SEM, TEM observations and XRD analysis. The results show that the peak aging occurred at 120 ℃ for 24 h. Under the peak-ageing condition, the tensile strength, yield strength and elongation of the studied alloy was 730 MPa, 705 MPa and 8.8%, respectively. The main strengthening mechanism of the alloy was precipitation hardening and the strengthening phase was GP zone and η′(MgZn 2).

Key concepts: Alloy, Microstructure, Materials science, Ultimate tensile strength, Precipitation hardening, Metallurgy, Elongation, 6063 aluminium alloy

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