Abstract
Sheets of 5754-aluminum alloy processed by a modified repetitive corrugation and straightening (RCS) process were tested in order to measure their formability. For this purpose, forming limit curves were derived. They showed that the material forming capacity decreased after being processed by RCS. However, they kept good formability in the initial stages of the RCS process. The formability study was complemented with microstructural analysis (derivation of texture) and mechanical tests to obtain the strain-rate sensitivity. The texture analysis was done by employing X-ray diffraction, obtaining pole figures, and the orientation distribution function. It was noticed that the initial texture was conserved after successive RCS passes, but the intensity dropped. RCS process did not induce β-fiber, contrary to common deformation process. The strain-rate sensitivity coefficient was measured through tensile tests at different temperatures and strain rates; the coefficient of the samples processed after one and two passes were still relatively high, indicating the capacity to delay necking, in agreement with the good formability observed in the initial passes of the RCS process.
Highlights
Aluminum alloys are widely used in industry due to their specific strength and forming capacity
To date, there are no reports of Al-5754 alloy processed by the so-called Repetitive Corrugation and Straightening (RCS) process, despite showing better forming capacity in comparison with other alloys from the same
With the deformation induced by the RCS process, the yield strength of the Al sheets increased at the expense of a loss in ductility (Figure 4)
Summary
Aluminum alloys are widely used in industry due to their specific strength and forming capacity. Aluminum sheets are one of the most required products for deep drawing applications. The AA5xxx series combine their strain hardening capacity with corrosion resistance, and acceptable forming capacity [1,2]. The effect of cold working in AA5xxx sheets have been widely studied [3,4]. Materials 2020, 13, 633 pressing (CGP), among others—have been reported for aluminum sheets [5,6,7,8]. To date, there are no reports of Al-5754 alloy processed by the so-called Repetitive Corrugation and Straightening (RCS) process, despite showing better forming capacity in comparison with other alloys from the same
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