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Effect of Precipitation Hardening on Mechanical and Corrosion Properties of 7075 Al-Base Alloy

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Abstract:

The 7xxx series Al-Zn-Mg-Cu alloys are stronger than other age-hardenable aluminum alloys at their maximum aging state (T6). Despite having a wide range of applications currently, 7075 aluminum (AA7075) still has certain restrictions because of flaws such stress corrosion cracking (SCC) susceptibility. Here, AA 7075-T6 aluminum alloys underwent a salt spray corrosion test to study pitting corrosion. A shot-blasting procedure in a solution containing 3.5% sodium chloride was also used after heat treatment and aging for five days. Refined microstructure, residual stress, and other surface features were identified. Localized corrosion and the propagation of stress cracks were evaluated in relation to the surface properties, including the treated microstructure and residual stress. The aged sample's microstructure was better after heat treatment compared to the control sample after shot peening. The elongation was caused by the maximum strength's value dropping from 476 MPa to 375 MPa. Due to the dispersion of precipitates during curing, the heat treatment caused the depth of stress corrosion cracking for the double shot to decrease.

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International Journal of Engineering Research in Africa Vol. 73 View Preview

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Periodical:

International Journal of Engineering Research in Africa (Volume 73)

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11-22

DOI:

https://doi.org/10.4028/p-k6AGR3

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Online since:

May 2025

Authors:

Fatima Ezzohra El Garchani*, Moulay Rachid Kabiri

Keywords:

AA 7075-T6, Heat Treatment, Mechanical Properties, SEM Fractography, Stress Corrosion

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