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Dynamic strain aging of a commercial Al-Mg-Si-Cu alloy during equal channel angular extrusion process
, Article Journal of Alloys and Compounds ; Volume 502, Issue 1 , July , 2010 , Pages 59-62 ; 09258388 (ISSN) ; Karimi Taheri, A ; Vaseghi, M ; Sharif University of Technology
2010
Abstract
In this research, the occurrence of dynamic strain aging (DSA) phenomenon during equal channel angular extrusion (ECAE) of a commercial air cooled Al-Mg-Si-Cu alloy is investigated. In order to detect the negative strain rate sensitivity behaviour associated with DSA, samples were ECAE-ed at various temperatures and strain rates. Subsequently, the extruded billets were subjected to mechanical and physical tests and it was found that at a certain ECAE temperature range there is a critical strain rate above which DSA occurs. The implication of the results to strengthening of dilute solid solutions is discussed
Deformation characteristics evaluation of modified equal channel angular pressing processes
, Article Materials Transactions ; Volume 51, Issue 1 , 2010 , Pages 46-50 ; 13459678 (ISSN) ; Nagasekhar, A. V ; Yoo, J. H ; El Aal, M. I. A ; Vaseghi, M ; Kim, H. S ; Sharif University of Technology
2010
Abstract
In current studies, equal channel angular pressing process (ECAP) and modified ECAP processes are simulated under ideal conditions to compare the deformation characteristics. The deformation behaviour is more complicated and the strain induced during the processes is highly non-uniform in the modified ECAP processes except in the equal channel multi-angular pressing (ECMAP) process with Route C. The strain homogeneity is more of a possibility with ECAP and ECMAP with Route C processes. The deformation stress state is widely distributed in nature in modified ECAP processes than in conventional ECAP. In addition, the load requirements are also higher in modified ECAP processes with that of the...