期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.12.027
关键词
Al-Mg alloy; Hall-Petch relationship; High-pressure torsion; Microhardness; Ultrafine grains
类别
资金
- European Union in the framework of the European Social Fund through the Warsaw University of Technology Development Programme
- National Centre for Research and Development within the project New materials and technologies for lightweight generic components of electric low-emission concept vehicle
- European Research Council under ERC Grant [267464-SPDMETALS]
The evolution of microstructure and microhardness was studied in a commercial 5483 Al-5Mg alloy processed by high-pressure torsion (HPT) under a pressure of 6.0 GPa up to 10 turns. Significant grain size refinement was observed even after 1/4 turn, and additional processing led to a further grain size reduction and a shift in the distribution of grain boundary misorientation angles towards higher values. An essentially fully homogeneous microstructure was reached after 10 turns with a final grain size of similar to 70 nm, a saturation Vickers microhardness of Hv approximate to 240 which was attained at and above equivalent strains of similar to 150, a relatively narrow grain size distribution and a fraction of similar to 80% of high-angle grain boundaries. Analysis shows the Hall-Fetch plot deviates from the conventional linear relationship for samples processed through small numbers of turns, but after 3 or more turns there is a direct correlation between the results obtained in HPT processing and coarse-grained samples. (C) 2014 Elsevier B.V. All rights reserved.
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