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Title: | Microstructural evolution and mechanical behavior of copper processed by low strain amplitude multi-directional forging. |
Authors: | Flausino, Paula Cibely Alves Nassif, Maria Elisa Landim Bubani, Franco de Castro Pereira, Pedro Henrique Rodrigues Aguilar, Maria Teresa Paulino de Cetlin, Paulo Roberto |
Keywords: | Severe plastic deformation |
Issue Date: | 2019 |
Citation: | FLAUSINO, P. C. A. et al. Microstructural evolution and mechanical behavior of copper processed by low strain amplitude multi-directional forging. Materials Science & Engineering A, v. 756, p. 474-483, maio 2019. Disponível em: <https://www.sciencedirect.com/science/article/abs/pii/S0921509319305489>. Acesso em: 10 mar. 2020. |
Abstract: | Experiments were performed to analyze the microstructural evolution and mechanical behavior of commercial-purity copper (99.8%) processed by up to 48 cycles of multi-directional forging (MDF) using a low strain amplitude of ∼0.075 (total accumulated strain ε ≈ 10.8). Parabolic work-hardening concomitantly with increasing dislocation densities was observed up to ε ≈ 2, followed by a practically constant flow stress due to dynamic recovery. The average grain size was reduced from 30.5 μm in the annealed metal down to 4.1 μm for ε ≈ 7.2; the fraction of sub-micrometric grains reached ∼12% for ε ≈ 10.8. The microstructural changes were attributed to the fragmentation of the original grains by dislocation structures having low misorientation angles which gradually evolved into arrays of high-angle grain boundaries with increasing numbers of MDF cycles. The Cu samples subjected to 48 cycles of MDF displayed limited dynamic recrystallization, exhibiting basically dislocation cells and sub-grains with an average size of ∼0.6 μm. It is demonstrated that low strain amplitude MDF delays the kinetics of grain refinement in copper compared with MDF using higher strain amplitudes. |
URI: | http://www.repositorio.ufop.br/handle/123456789/12700 |
metadata.dc.identifier.uri2: | https://www.sciencedirect.com/science/article/abs/pii/S0921509319305489?via%3Dihub |
metadata.dc.identifier.doi: | https://doi.org/10.1016/j.msea.2019.04.075 |
ISSN: | 0921-5093 |
Appears in Collections: | DEMET - Artigos publicados em periódicos |
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File | Description | Size | Format | |
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ARTIGO_MicrostructuralEvolutionMechanical.pdf Restricted Access | 17,97 MB | Adobe PDF | View/Open |
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