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Materials 2016, 9(3), 130; doi:10.3390/ma9030130

Residual Ductility and Microstructural Evolution in Continuous-Bending-under-Tension of AA-6022-T4

Department of Mechanical Engineering, University of New Hampshire, Durham, NH 03824, USA
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Author to whom correspondence should be addressed.
Academic Editor: Nooman Ben Khalifa
Received: 18 December 2015 / Revised: 6 February 2016 / Accepted: 15 February 2016 / Published: 26 February 2016
(This article belongs to the Special Issue Forming of Light Weight Materials)
View Full-Text   |   Download PDF [5025 KB, uploaded 26 February 2016]   |  

Abstract

A ubiquitous experiment to characterize the formability of sheet metal is the simple tension test. Past research has shown that if the material is repeatedly bent and unbent during this test (i.e., Continuous-Bending-under-Tension, CBT), the percent elongation at failure can significantly increase. In this paper, this phenomenon is evaluated in detail for AA-6022-T4 sheets using a custom-built CBT device. In particular, the residual ductility of specimens that are subjected to CBT processing is investigated. This is achieved by subjecting a specimen to CBT processing and then creating subsize tensile test and microstructural samples from the specimens after varying numbers of CBT cycles. Interestingly, the engineering stress initially increases after CBT processing to a certain number of cycles, but then decreases with less elongation achieved for increasing numbers of CBT cycles. Additionally, a detailed microstructure and texture characterization are performed using standard scanning electron microscopy and electron backscattered diffraction imaging. The results show that the material under CBT preserves high integrity to large plastic strains due to a uniform distribution of damage formation and evolution in the material. The ability to delay ductile fracture during the CBT process to large plastic strains, results in formation of a strong <111> fiber texture throughout the material. View Full-Text
Keywords: continuous-bending-under-tension; aluminum alloys; ductility; anisotropy; crystallographic texture; voids continuous-bending-under-tension; aluminum alloys; ductility; anisotropy; crystallographic texture; voids
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zecevic, M.; Roemer, T.J.; Knezevic, M.; Korkolis, Y.P.; Kinsey, B.L. Residual Ductility and Microstructural Evolution in Continuous-Bending-under-Tension of AA-6022-T4. Materials 2016, 9, 130.

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