期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.06.074
关键词
Severe plastic deformation; Cyclic expansion-extrusion; Aluminum; Mechanical properties; Microstructure; Micro-shear band
类别
资金
- French State through the program Investment in the future
- Research Council office of Shiraz University [92-GR-ENG-15]
This paper introduces two new processing routes for a recently introduced severe plastic deformation technique, cyclic expansion-extrusion (CEE). Two processing Routes (I and II) were experimentally performed on aluminum alloy 1050; the processed samples were investigated and compared in terms of their microstructural and mechanical characteristics. A significant improvement in mechanical properties was observed after one CEE pass via both processing routes. However, different grain structures were achieved after Routes I and II showing a more homogeneous microstructure and hardness distribution in Route II compared to Route I. In addition, compression tests of the processed samples demonstrated that Route II results in a homogeneous compressive strength. Finally, microstructure evolution during subsequent passes of this process was investigated by electron back scattered diffraction. Micro-shear bands were found as potential sites for accelerating the formation of new grains which resulted in fragmentation of the initial grains and leading to an ultrafine-grained (UFG) microstructure. (C) 2014 Elsevier B.V. All rights reserved.
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