Microstructural evolution and mechanical behavior of copper processed by low strain amplitude multi-directional forging.

dc.contributor.authorFlausino, Paula Cibely Alves
dc.contributor.authorNassif, Maria Elisa Landim
dc.contributor.authorBubani, Franco de Castro
dc.contributor.authorPereira, Pedro Henrique Rodrigues
dc.contributor.authorAguilar, Maria Teresa Paulino de
dc.contributor.authorCetlin, Paulo Roberto
dc.date.accessioned2020-09-07T20:25:52Z
dc.date.available2020-09-07T20:25:52Z
dc.date.issued2019
dc.description.abstractExperiments 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.pt_BR
dc.identifier.citationFLAUSINO, 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.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.msea.2019.04.075pt_BR
dc.identifier.issn0921-5093
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/12700
dc.identifier.uri2https://www.sciencedirect.com/science/article/abs/pii/S0921509319305489?via%3Dihubpt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.subjectSevere plastic deformationpt_BR
dc.titleMicrostructural evolution and mechanical behavior of copper processed by low strain amplitude multi-directional forging.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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