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Improvements in elongation and tradeoffs in strength and ductility of several Mg sheet alloys through cyclic bending under tension and annealing

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Abstract

This paper presents results acquired from experimental investigations into determining the influence of cyclic-bending-under-tension (CBT) and annealing on elongation-to-fracture (ETF) and tradeoffs in strength and ductility of three Mg sheet alloys: ZEK100, BioMg250, and Mg4Li. The CBT process imparts uniform deformation greater than achievable in simple tension (ST) incrementally by subjecting a sheet specimen to simultaneous tension with a crosshead motion and bending with a set of rollers reciprocating along the specimen. The space of process parameters including crosshead velocity and bending depth is explored initially to achieve the greatest ETF of ZEK100 alloy. Improvements in ETF of about 40% are attained using CBT relative to ST. Given the uniform deformation imparted by CBT to large plastic strains, tradeoffs in strength and ductility of the alloy are investigated next by subjecting the alloy sheets to a certain number of CBT cycles under the optimized parameters and subsequent annealing. Strength of the alloy is found to increase by a factor of 1.4 along the sheet strongest direction, the rolling direction, and a factor of 2 along the sheet softest direction, the transverse direction. Since the strength improved more along the soft direction than along the hard direction, the alloy anisotropy reduces. Significantly, the strength can increase for about 40% along the soft direction, while reducing the anisotropy and preserving at least 10% of the alloy ductility in every direction. Characterization of microstructural evolution using electron-backscattered diffraction and texture evolution using neutron diffraction revealed slip dominated deformation of the alloy. Similar processing and testing of BioMg250 and Mg4Li sheet alloys produced even better results in terms of enhancing elongation and improving the contrasting strength and ductility properties. Comprehensive data for the three alloys and insights from the investigations are presented and discussed.

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Acknowledgements

This work is based upon projects supported by the U.S. National Science Foundation under a CAREER grant CMMI-1650641 and a GOALI grant CMMI-2147122. Rolled sheets of ZEK100 were provided by Michael Worswick of University of Waterloo. Rolled sheets of BioMg250 were provided by nanoMAG, LLC. Extruded sheets of Mg4Li were provided by Technische Universität Berlin. These are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of New Hampshire, 33 Academic Way, Kingsbury Hall, W119, Durham, NH, 03824, USA

    Nikolai Matukhno, Nemanja Kljestan & Marko Knezevic

  2. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Sven C. Vogel

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Appendix 1

Appendix 1

This appendix presents a photograph of the CBT apparatus (Fig. 16) and tables with the elastic slope (E, GPa), yield strength (YS, MPa), ultimate tensile strength (UTS, MPa), strain at fracture, and uniform ductility inferred from the measured flow curves (Tables 6, 7, and 8). More data about ETF in CBT normalized by ETF in ST for the RD testing directions of alloy ZEK100 is presented in Fig. 17.

Fig. 16
figure 16

A photograph of the apparatus for CBT highlighting the main components

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Table 6 Mechanical properties from the flow curves for ZEK100
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Table 7 Mechanical properties from the flow curves for BioMg250
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Table 8 Mechanical properties from the flow curves for Mg4Li
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Fig. 17
figure 17

ETF in CBT normalized by ETF in ST for the RD testing directions of alloy ZEK100

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Matukhno, N., Kljestan, N., Vogel, S.C. et al. Improvements in elongation and tradeoffs in strength and ductility of several Mg sheet alloys through cyclic bending under tension and annealing. Int J Mater Form 16, 52 (2023). https://doi.org/10.1007/s12289-023-01776-x

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