Research Articles

Equal channel angular pressing technique for the formation of ultra-fine grained structures

Kazeem O. Sanusi, Oluwole D. Makinde, Graeme J. Oliver
South African Journal of Science | Vol 108, No 9/10 | a212 | DOI: https://doi.org/10.4102/sajs.v108i9/10.212 | © 2012 Kazeem O. Sanusi, Oluwole D. Makinde, Graeme J. Oliver | This work is licensed under CC Attribution 4.0
Submitted: 08 April 2010 | Published: 02 October 2012

About the author(s)

Kazeem O. Sanusi, Department of Industrial Engineering, Stellenbosch University, Stellenbosch Department of Mechanical Engineering, Cape Peninsula University of Technology, Bellville campus, Cape Town, South Africa
Oluwole D. Makinde, Institute for Advance Research in Mathematical Modelling & Computations, Cape Peninsula University of Technology, Cape Town, South Africa
Graeme J. Oliver, Department of Mechanical Engineering, Cape Peninsula University of Technology, Bellville campus, Cape Town, South Africa


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Abstract

Equal channel angular pressing is one of the techniques in metal forming processes in which an ultra-large plastic strain is imposed on a bulk material in order to make ultra-fine grained and nanocrystalline metals and alloys. The technique is a viable forming procedure to extrude materials by use of specially designed channel dies without substantially changing the geometry by imposing severe plastic deformation. This technique has the potential for high strain rate superplasticity by effective grain refinement to the level of the submicron-scale or nanoscale. Wereview recent work on new trends in equal channel angular pressing techniques and the manufacturing of die-sets used for the processing of metals and alloys. We also experimented on a copper alloy using the equal channel angular pressing technique to examine the microstructural, mechanical and hardness properties of the ultra-fine grained and nanocrystalline materials produced. After deformation, all samples were subjected to a hardness test and the results showed improved mechanical behaviour of the ultra-fine grained copper alloy that was developed. This research provides an opportunity to examine the significance of the equal channel angular pressing process for metals and alloys. That is, these ultra-fine grained materials can be used in the manufacturing of semi-finished products used in the power, aerospace, medical and automotive industries.

Keywords

severe plastic deformation; equal channel angular pressing; ultra-fine grained; mechanical properties; microstructure

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