Abstract
Adiabatic shear bands (ASBs) are known to be the dominant damage mechanisms in structural materials under high strain rate loading such as magnesium (Mg) alloys. Therefore, to tailor the mechanical performance of Mg alloys for structural applications, there is a need to understand their susceptibility to strain localization and formation of ASBs, including the mechanism of crack initiation and propagation. In this study, as-fabricated (extruded) and heat-treated (annealed at 400 °C) AZ31B Mg alloys were subjected to high strain rate loading using the direct impact Hopkinson pressure bar (DIHPB) under different strain rates (834–2435 s−1) at room temperature. The impact specimens failed through the occurrence of strain localization, formation of diffused ASBs, and initiation/propagation of micro-cracks along the path of evolved ASBs. Thus, strain localization results in crack initiation and propagation despite the inherent brittle nature of the Mg alloys. Furthermore, in regions with evolved shear bands, there was a low occurrence of twin/micro-twins. This observation suggests that shear band formation dominates over the micro-twinning effect in Mg alloys. Also, the presence of fractured second-phase particles dispersed within voids and along shear band path suggests particle fragmentation and refinement due to the strain localization. Second-phase particle fragmentation also played a role in void nucleation, growth, and coalescence during the deformation. In addition, there seems to be a threshold strain rate (~>2225 s−1) beyond which the specimen fractures regardless of the initial microstructure of the Mg alloys.
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Acknowledgement
The authors thank Falconmet Engineering and Laboratories Inc., ON, Canada, for the technical support they provided.
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The authors received financial support provided by the National Science and Engineering Research Council of Canada (NSERC) towards this research.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Francis Tetteh, Solomon Hanson Duntu, and Solomon Boakye-Yiadom. The funding acquisition, conceptualization, supervision, and resources were provided by Solomon Boakye-Yiadom. The first draft of the manuscript was written by Francis Tetteh. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Tetteh, F., Duntu, S.H. & Boakye-Yiadom, S. Susceptibility of adiabatic shear band formation in AZ31B magnesium alloy during high strain rate impact. Int J Adv Manuf Technol 128, 2161–2174 (2023). https://doi.org/10.1007/s00170-023-12049-x
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DOI: https://doi.org/10.1007/s00170-023-12049-x