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. 2020 Jan 31;13(3):633.
doi: 10.3390/ma13030633.

Formability of the 5754-Aluminum Alloy Deformed by a Modified Repetitive Corrugation and Straightening Process

Marco Ezequiel  1 , Sergio Elizalde  2 , José-María Cabrera  2   3 , Josep Picas  4 , Ignacio A Figueroa  1 , Ismeli Alfonso  5 , Gonzalo Gonzalez  1
Affiliations

Formability of the 5754-Aluminum Alloy Deformed by a Modified Repetitive Corrugation and Straightening Process

Marco Ezequiel et al. Materials (Basel). .

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.

Keywords: RCS; aluminum alloys; forming capacity; strain-rate sensitivity; texture.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
New die design used for the RCS process.
Figure 2
Figure 2
(a) Geometries for the Nakajima (all dimensions are in mm) and (b) sample painted with the stochastic pattern, intended to follow the deformation during the tests.
Figure 3
Figure 3
Setup for the Nakajima test with two recording cameras, the sample and the tribo-system.
Figure 4
Figure 4
Changes of mechanical properties on the Al sheets as a result of the number of RCS passes.
Figure 5
Figure 5
Fractured Nakajima samples for the sheets processed after one RCS pass.
Figure 6
Figure 6
Forming limit curves of the material before and after being processed by RCS, and comparison curves from the literature [28,29].
Figure 7
Figure 7
Comparison of the fractures after the Nakajima tests in samples with (a) zero (b) one and (c) two RCS passes.
Figure 8
Figure 8
Evolution of the ODF’s on samples at 0P, 1P, 2P deformation passes, and the key components of the identified texture.
Figure 9
Figure 9
Maximum stress versus strain-rate for different temperatures and their respective m coefficient for samples processed by one RCS pass.
Figure 10
Figure 10
Maximum stress versus strain-rate for different temperatures and their respective m coefficient for samples processed by two RCS passes.
See this image and copyright information in PMC

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