期刊
SCRIPTA MATERIALIA
卷 67, 期 10, 页码 814-817出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2012.07.030
关键词
Nanostructure; High-pressure torsion (HPT); Severe plastic deformation (SPD); Stacking fault energy; Ductility
类别
资金
- Japan Society for Promotion of Science (JSPS)
- National Science Foundation, USA [DMR-0804528]
- Light Metals Education Foundation of Japan
- MEXT, Japan, in Innovative Areas Bulk Nanostructured Metals
- Kyushu University Interdisciplinary Programs in Education and Projects in Research Development
- MEXT, Japan [24246113]
- Advanced Low Carbon Technology Research and Development Program of the Japan Science and Technology Agency (JST)
Nanostructured intermetallics generally exhibit high strength but limited plasticity due to the covalent nature of their bonding. In this study, high-pressure torsion followed by annealing was used to produce TiAl intermetallics with two microstructural features: (i) bimodal microstructure composed of nanograins and submicrometer grains; and (ii) nanotwins. An exceptional performance, combining ultrahigh yield strength, similar to 2.9 GPa, and high strain to failure, similar to 14%, was achieved with micropillar compression tests. Twinning, dislocation slip and grain boundary sliding appear to be active under compressive stress. (c) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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