Caracterização elétrica e mecânica da liga de alumínio AA 1050, com estrutura ultrafina processada pela técnica de deformação plástica intensa (DPI)

• Autor(a) principal: Guerra, Maria Claudia Lopes
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações do Mackenzie
• Texto Completo: http://dspace.mackenzie.br/handle/10899/24190
• topic: deformação plástica intensa (DPI); prensagem em canais equiangulares (PCE); equal channel angular pressing (ECAP); ultra refino de grão; liga de alumínio 1050; encruamento por deformação plástica; severe plastic deformation (SPD); equal channel angular pressing (ECAP); ultra grain refining; aluminum alloy 1050; hardening by plastic deformation; CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA

The ECAP (Equal Channel Angular Pressing) is a mechanical process of Severe Plastic Deformation (SPD) where a sample is subjected to a shearing force when passing through the region of intersection of two channels. The main goal of this method is Severe Plastic Deformation achieve a microstructure with ultrafine grains, which have much higher than the equivalent coarse grain materials physical properties, such as an increase in strength and toughness simultaneously. What makes this increasingly interesting technique is that as there is no reduction cross section is possible to obtain plastic strain accumulation and therefore gain in grain order of nanometer scale. The great advantage of ECAP is to achieve a much higher degree of strain hardening than obtained by conventional methods of plastic deformation, and consequently a grain refining much higher as well. The importance of the study of severe plastic deformation process is on improving the mechanical performance of the materials and the possibility of a better understanding of the mechanisms of strain hardening, which may indicate a new path for producing high-strength materials, possibly scaled industrial. In this work are presented the microstructural, mechanical and electrical analysis of the aluminum alloy AA 1050 samples, commonly used for electrical purposes, with ultrafine grains (typical grain size below a micron) resulting from processing by ECAP, based on the method of SPD.