Effect of Crystal Orientation on Nanoindentation Behavior in Magnesium
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11661_2016_3479_ReferencePDF.pdf
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1.09 MB
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Author(s)
Somekawa, Hidetoshi
Schuh, Christopher A
Date Issued
April 2016
Journal
Metallurgical and Materials Transactions A
Publisher
Springer US
Citation
Somekawa, Hidetoshi, and Christopher A. Schuh. “Effect of Crystal Orientation on Nanoindentation Behavior in Magnesium.” Metallurgical and Materials Transactions A 47.6 (2016): 3227–3234.
Version
Author's final manuscript
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 73[superscript b3] 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 over 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 over 1]2 } twins.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1007/s11661-016-3479-6
