Elena Avtokratova, Oleg Sitdikov, Oksana Latypova, Michael Markushev

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Microstructure and mechanical properties of the 1570C aluminum alloy were studied after equal channel angular pressing (ECAP) to the strain of 3 at 325°C and subsequent warm and cold rolling with near 80% reductions at 325°C and 20°C, respectively. Even containing a partially recrystallized bimodal structure with a volume fraction of ultrafine grains of 0.3 and their size not exceeding 2 mm, the alloy after ECAP demonstrated an excellent balance of room temperature static strength parameters (yield strength (YS) » 300 MPa, tensile strength (UTS) » 400 MPa and elongation (El) » 26%), and high strain rate superplasticity (with maximum elongation exceeding 2500% at 520°C and a strain rate of 1.4 × 10-2 s- 1). Subsequent warm and cold rolling resulted in an increase in YS to 340 and 430 MPa and UTS to 415 and 485 MPa amid El decreased to 24 and 11%, respectively. Despite the difference in the deformation structures formed in both rolling states, similar superplastic behavior was observed with maximum elongations of up to 3000% at temperatures of 500-520°C and strain rates of about 10-2 s-1. It was concluded that the initial processing of the alloy to relatively low ECAP strains before warm/cold rolling, leading to bimodal structure with a low fraction of ultrafine grains, is sufficient to ensure a favorable combination of both service and technological properties of the sheets obtained.


Aluminum Alloy, Equal Channel Angular Pressing, Rolling, Superplasticity

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DOI: https://doi.org/10.22190/FUME200601023A


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ISSN: 2335-0164 (Online)

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