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Grain refinement in constrained groove pressing of metals and alloys

Dariusz Kurowski 1Radosław W. Łyszkowski 1Jerzy Bystrzycki 1Anna Fraczkiewicz 2Zbigniew Bojar 1

1. Military University of Technology, Faculty of Advanced Technology and Chemistry, Kaliskiego 2, Warszawa 00-908, Poland
2. Ecole nationale Superieure des Mines de Saint Etienne, 158 cours fauriel, Saint-Etienne 42030, France

Abstract

Severe plastic deformation (SPD) is one of the most effective methods for producing nanocrystalline (grain size < 100 nm) or ultrafine-grained (100 nm < grain size < 1000 nm) metals and alloys. There are several SPD techniques to synthesize bulk nano- or ultrafine metals (alloys), including equal channel angular pressing (ECAP) and high-pressure torsion (HPT). However, both of these techniques are discontinuous processes and can be applied to fabrication of samples up to certain sizes. Recently, it has been shown the effectiveness of constrained groove pressing or rolling (CGP/R) in reducing the grain size from tens of micrometers to submicrometers in several materials. In our work the applicability of CGP for grain refinement and improvement in mechanical properties of different metals and alloys was studied. The influence of repeated CGP (different number of passes) on the microstructure refinement was investigated by transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD). Changes in mechanical properties were measured by tensile and hardness tests and then related to microstructure development.

 

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Presentation: Poster at E-MRS Fall Meeting 2009, Symposium H, by Radosław W. Łyszkowski
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-25 11:37
Revised:   2009-09-05 19:43