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Development of new routes of severe plastic deformation through cyclic expansion-extrusion process

Abstract : 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.
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https://hal.univ-lorraine.fr/hal-01503722
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Submitted on : Friday, April 7, 2017 - 2:28:00 PM
Last modification on : Tuesday, October 19, 2021 - 11:46:26 AM

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N. Pardis, Cai Chen, M. Shahbaz, R. Ebrahimi, Laszlo S. Toth. Development of new routes of severe plastic deformation through cyclic expansion-extrusion process. Materials Science and Engineering: A, Elsevier, 2014, 613, pp.357-364. ⟨10.1016/j.msea.2014.06.074⟩. ⟨hal-01503722⟩

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