Microstructure, tensile properties and intergranular corrosion resistance of 7075 aluminum alloy under multi-directional severe strain and aging

doi:10.13251/j.issn.0254-6051.2021.06.033

Abstract

Abstract: Microstructure and properties of 7075 aluminum alloy treated by multi-directional forging and aged at 80 ℃ for 1260 min were studied by means of OM, TEM, mechanical properties and intergranular corrosion testing, and intergranular corrosion resistance of the specimen under different states was analyzed emphatically. The results show that after multi-directional forging and aging, the grains of the specimen are refined obviously, the strength is improved greatly and the plasticity is maintained well, meanwhile, the intergranular corrosion resistance is improved due to the discontinuously distributed grain boundary precipitates. Finally, the obtained optimal comprehensive properties of the specimen are: tensile strength of 640.25 MPa, elongation of 16.59%, and self corrosion current density of 1.077×10^-4 A·cm^-2.

Key words: 7075 aluminum alloy, multi-directional forging, aging treatment, strength, intergranular corrosion

CLC Number:

Cao Yanyan, Huang Tiantian, Wei Chunhua, Yan Weilin. Microstructure, tensile properties and intergranular corrosion resistance of 7075 aluminum alloy under multi-directional severe strain and aging[J]. Heat Treatment of Metals, 2021, 46(6): 168-171.

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