Hardness and Texture of Electrolytic Copper Processed by ECAP at Ambient and Warm Temperature

Hiron Akira Yamada Magalhães; Talita Gama Souza; Rodrigo Felix de Araujo Cardoso; Bruno Rangel Silva; Luiz Paulo Brandão

doi:10.14295/vetor.v31i2.13743

Autores

Hiron Akira Yamada Magalhães Instituto Militar de Engenharia (IME)
Talita Gama Souza Instituto Militar de Engenharia
Rodrigo Felix de Araujo Cardoso Centro Brasileiro de Pesquisas Físicas
Bruno Rangel Silva Centro Brasileiro de Pesquisas Físicas
Luiz Paulo Brandão Instituto Militar de Engenharia

DOI:

https://doi.org/10.14295/vetor.v31i2.13743

Palavras-chave:

Cobre, ECAP, Textura Cristalográfica, Densidade de Discordâncias , Microdureza

Resumo

Dentre os diversos métodos de deformação plástica severa (DPS), o processo de extrusão por canal equiangular (ECAP – Equal Channel Angular Pressing) é um dos mais populares. Este processo tem como principal característica produzir materiais com grãos ultrafinos ou até mesmo grãos nanométricos. Devido a estas mudanças microestruturais é possível gerar melhoria em algumas propriedades mecânicas como a resistência e ductilidade. Nesta perspectiva, pretendeu-se no presente trabalho avaliar as variações da propriedade mecânica dureza associada às alterações microestruturais e texturais do cobre puro, em função das variações de parâmetros do processo por DPS via ECAP. Para isto o material foi submetido a quatro passes através das rotas A (a amostra é pressionada repetidamente sem qualquer rotação entre cada passagem) e Bc (a amostra é rotacionada no mesmo sentido em 90° entre cada passagem) em temperatura ambiente e a morno. Por meio do resultado obtido verificou-se que na temperatura ambiente a rota Bc foi a que promoveu maior homogeneidade na microestrutura e enfraquecimento da textura após o quarto passe. O processamento do cobre por ECAP a morno promoveu um amolecimento das amostras e uma distribuição homogênea da dureza em ambas a rotas.

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