Abstract
The effect of crystal orientation on nanoindentation behavior at both quasi-static and high strain rates was investigated using single-crystalline magnesium oriented in basal and prismatic configurations. Both the basal and prismatic planes had similar activation volumes, 55 and 73b 3 for deformation at room temperature, as well as a small temperature dependence up to 423 K (150 °C). Microstructural observations beneath the indentations revealed that {\( 10\bar{1}2 \)} type deformation twins were formed in both orientations irrespective of testing temperature. With twins forming beneath the indenter and multiple orientations of loading, it is believed that cross-slip and/or multiple slip are likely rate-controlling for global deformation, which also aligns with observations on nanoindentation of polycrystalline coarse-grained magnesium. The locations of the twins were consistent with expectations based on indentation mechanics as assessed by finite element simulations. The finite element simulations also predicted that an indenter tip with a shaper tip radius would tend to promote {\( 10\bar{1}2 \)} twins.
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Acknowledgments
The authors are grateful to Dr. A. F. Schwartzman (Massachusetts Institute of Technology) for his help with the dynamic indentation method and Dr. T. Inoue (National Institute for Materials Science) for his contractive discussion about FE simulation. This work was supported at MIT by the US Army Research Office through the Institute for Solider Nanotechnologies and by the JSPS Grant-in-Aid (C) No. 25420765.
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Manuscript submitted June 13, 2015.
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Somekawa, H., Schuh, C.A. Effect of Crystal Orientation on Nanoindentation Behavior in Magnesium. Metall Mater Trans A 47, 3227–3234 (2016). https://doi.org/10.1007/s11661-016-3479-6
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DOI: https://doi.org/10.1007/s11661-016-3479-6