Orientation-dependent indentation response of magnesium single crystals: Modeling and experiments

Title
Orientation-dependent indentation response of magnesium single crystals: Modeling and experiments
Authors
Balaji Selvarajou신중호하태권최인석Shailendra P. JoshiHeung Nam Han
Keywords
Nanoindentation; Elasto-plastic contact; Magnesium; Crystal-plasticity; Pile-up
Issue Date
2014-12
Publisher
Acta materialia
Citation
VOL 81, 358-376
Abstract
We investigate the orientation-dependent characteristics of magnesium single crystals under localized contact using nanoindentation experiments and crystal plasticity finite element (CPFE) simulations. Nanoindentation experiments on (0 0 0 1) and (1 1 2 0) planes exhibited distinct load–depth responses. Atomic force microscopy revealed material pile-up with sixfold symmetry in the former case and a sink-in phenomenon with twofold symmetry in the latter case. Our corresponding detailed CPFE simulations uncover the evolution of deformation activity in the indented volume, thereby providing insight into the interacting effects that cause the pile-up and sink-in phenomena. The simulations indicate the occurrence of {1 0 1 2} extension twins in both cases, although their spatial locations are different. These observations strongly corroborate with our transmission electron microscopic analysis of the indented samples. Finally, our simulations also indicate that, depending upon the crystal orientation, elastic recovery upon unloading may play important role in final surface morphology around the indented region.
URI
http://pubs.kist.re.kr/handle/201004/48318
ISSN
13596454
Appears in Collections:
KIST Publication > Article
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