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Entree

Grain refinement and properties of ultrafine-grained AI, Mg and Ti alloys produced by equal-channel angular pressing with back-pressure

Processo: 11/51245-8
Linha de fomento:Auxílio à Pesquisa - Regular
Vigência: 01 de setembro de 2011 - 31 de maio de 2012
Área do conhecimento:Engenharias - Engenharia de Materiais e Metalúrgica - Metalurgia Física
Convênio/Acordo: University of Southampton
Pesquisador responsável:Alberto Moreira Jorge Junior
Beneficiário:Alberto Moreira Jorge Junior
Pesq. responsável no exterior: Terence G. Langdon
Instituição no exterior: University of Southampton, Inglaterra
Instituição-sede: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos, SP, Brasil
Vinculado ao auxílio:09/17068-1 - Desenvolvimento de ligas de Mg para armazenagem de hidrogênio processadas por deformação plástica severa, AP.R
Assunto(s):Deformação e estresses 

Resumo

Severe plastic deformation (SPO) techniques have been widely evaluated for the production of materiais with ultrafine microstructure with grains. Among these procedures, ECAP is an especially attractive one and quite a number of recent scientific and engineering publications are devoted to studying considerable plastic strain, in particular, the strain created by equal channel angular pressing (ECAP). The number of such works continues to grow, which is explainable in the first turn by the relative simplicity of the ECAP process and by the possibility of obtaining exceptionally fine grains of submicron size. This results in considerable improvement of the mechanical properties of the alloys. However, applications of ECAP can be restricted during processing of hard-to-deforrn and low-ductility materiais. It is known that in order to effectively refine the structure and achieve superior properties ECAP should be realized in several cycles. The high levei of accumulated strain can result in crack initiation and failure of samples, which is connected with non-conformance of ductility and the levei of specific pressures holding back the sample failure. The deformation capacity of the material improves at elevated temperatures. However, the recovery processes and microstructure recrystallization makes it difficull to achieve lhe maximum degree of refinement and extraordinary properties. One of the effective ways to enhance the deformability resource durin ECAP is to increase the hydrostatic pressure. (AU)

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