Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 77, Issue -, Pages 174-191Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2015.10.005
Keywords
Dislocations; Crystal plasticity; Mechanical testing; Finite elements; Deformation kink band
Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [23109001, 23109008]
- Light Metals Educational Foundation of Japan
- Council for Science, Technology and Innovation (CSTI), Cross-Ministerial Strategic Innovation Promotion Program (SIP), (Project: Innovative design/manufacturing technologies) from the New Energy and Industrial Technology Development Organization (NEDO)
- Grants-in-Aid for Scientific Research [26109717, 26420020] Funding Source: KAKEN
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Variations in deformation kink band formation behavior with loading orientation were examined by the combination of experiment and computer simulation, using the Zn single crystal as a model material. Based on the results, the controlling factors for the formation behavior of deformation kink bands and its general features were discussed. Due to compression parallel to the basal plane, several deformation bands formed in the Zn single crystal. By the examination of the crystallographic nature of the deformation bands, they were found to exhibit three characteristic features: an ambiguous crystal rotation axis on the [00011 zone axis, an arbitrary rotation angle with a wide variation, and a variation in the crystal rotation angle within the deformation band boundary itself. In addition, an analysis protocol to classify the nature of the deformation bands via the observation on (0001) was newly proposed. As a result, the deformation bands formed in the Zn single crystal were confirmed to be predominantly deformation kink bands rather than deformation twining. Among the abovementioned three crystallographic features, we first experimentally confirmed by using the single crystal that the variations in the rotation axis in deformation kink bands exhibit a strong dependence on loading orientation. Using computer simulation based on the crystal plasticity finite element analysis, the origin of the variation in rotation axis in deformation kink bands was clarified to be due to the initiation of different types of basal dislocations that construct the deformation kink band boundaries, which depends on the loading orientation. In addition, the variations in types of the dislocations owing to the internal stress were found to cause the significant waviness of the deformation band boundaries on (0001) specimen surface. (C) 2015 Elsevier Ltd. All rights reserved.
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