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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
engineering
Ultrafine grains and the Hall-Petch relationship in an Al-Mg-Si alloy processed by high-pressure torsion
Materials Science and Engineering: A, Volume 532, Year 2012
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Description
Experiments were conducted to evaluate the evolution of hardness and microstructure in a commercial Al-0.6% Mg-0.4% Si alloy during processing by high-pressure torsion (HPT). The HPT was conducted under a pressure of 6.0. GPa and disks were torsionally strained to a maximum of 20 turns. It is shown that processing by HPT leads to microstructural refinement with an average grain size of ~250. nm and to an increase in hardness up to a saturation value at equivalent strains above ~100. There is a deviation in the Hall-Petch relationship at grain sizes smaller than ~500. nm and this is consistent with an earlier suggestion that a breakdown may occur if there is an easy movement of the extrinsic dislocations in the non-equilibrium grain boundaries introduced by HPT processing. © 2011 Elsevier B.V.
Authors & Co-Authors
Loucif, Aicha
Algeria, Annaba
Université Badji Mokhtar - Annaba
Figueiredo, Roberto Braga
Brazil, Belo Horizonte
Universidade Federal de Minas Gerais
Baudin, T.
France, Orsay
Institut de Chimie Moléculaire et Des Matériaux D'orsay
Brisset, François
France, Orsay
Institut de Chimie Moléculaire et Des Matériaux D'orsay
Chemam, Rafik
Algeria, Annaba
Université Badji Mokhtar - Annaba
Langdon, Terence G.
United Kingdom, Southampton
University of Southampton
United States, Los Angeles
University of Southern California
Statistics
Citations: 136
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1016/j.msea.2011.10.074
ISSN:
09215093
Study Approach
Qualitative