Abstract
A yield plateau occurs in some Mg alloys during compressive deformation that has been ascribed to the localization of twinning. In fine-grained AZ31, this plateau was explained by a region of large twin volume fraction nucleating in a small band and propagating, similar to a “Lüders band” like phenomena. Once the band traverses the entire gauge length, the sample begins to strain harden. Similarly, ZK60 samples exhibit the same Lüders like phenomena during extrusion direction compression as confirmed by digital image correlation. However, the band is not sufficient to fully explain the plateau in the stress-strain curve. Postmortem electron backscattered diffraction (EBSD) reveals the twin structure evolution through this plateau. It is found that twinning occurs in large elongated grains before spreading to the finer grains.
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Agnew, S.R., Calhoun, C.A., Bhattacharyya, J.J. (2016). What is in a Strain Hardening “Plateau”?. In: Singh, A., Solanki, K., Manuel, M.V., Neelameggham, N.R. (eds) Magnesium Technology 2016. Springer, Cham. https://doi.org/10.1007/978-3-319-48114-2_38
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DOI: https://doi.org/10.1007/978-3-319-48114-2_38
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48620-8
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