Influence of processing temperature on microhardness evolution, microstructure and superplastic behaviour in an Al-Mg alloy processed by high-pressure torsion.

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorMachado, Denise C.-
Autor(es): dc.creatorFlausino, Paula Cibely Alves-
Autor(es): dc.creatorHuang, Yi-
Autor(es): dc.creatorCeltin, Paulo Roberto-
Autor(es): dc.creatorLagdon, Terence G.-
Autor(es): dc.creatorPereira, Pedro Henrique Rodrigues-
Data de aceite: dc.date.accessioned2025-08-21T15:59:32Z-
Data de disponibilização: dc.date.available2025-08-21T15:59:32Z-
Data de envio: dc.date.issued2024-11-13-
Data de envio: dc.date.issued2024-11-13-
Data de envio: dc.date.issued2022-
Fonte completa do material: dc.identifierhttps://www.repositorio.ufop.br/handle/123456789/18979-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.jmrt.2023.03.167-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1029452-
Descrição: dc.descriptionExperiments were conducted to assess the effect of processing temperature on the hard ness evolution, microstructure and the flow properties of an annealed Ale3Mg alloy pro cessed by high-pressure torsion (HPT) at either 300 or 450 K. The results demonstrate that HPT processing at room temperature (RT) leads to higher microhardness values with a more uniform hardness distribution in the Al alloy compared with processing at 450 K. After 10 HPT turns at RT, the microstructure displayed a more intense grain refinement, a higher dislocation density and smaller Al3Mg2 precipitates than after HPT at 450 K. Accordingly, the metal processed at RT showed enhanced strength at RT and consistently exhibited superplastic flow during deformation at 523 K, with tensile elongations of -530 -650% for strain rates from 10 3 to 10 2 s 1. Conversely, a maximum elongation of -110% was recorded at 523 K in the alloy processed by HPT at 450 K. This behaviour is attributed to an enhanced thermal stability in the metal processed at RT compared with HPT at 450 K where deformation at 523 K led to the onset of abnormal grain coarsening due to a more disperse distribution of grain sizes and the partial dissolution and coalescence of Al3Mg2 precipitates after HPT processing.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsaberto-
Direitos: dc.rightsThis is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/). Fonte: PDF do artigo.-
Palavras-chave: dc.subjectAluminium alloys-
Palavras-chave: dc.subjectHardness-
Palavras-chave: dc.subjectHigh-pressure torsion-
Palavras-chave: dc.subjectSuperplasticity-
Palavras-chave: dc.subjectThermal stability-
Título: dc.titleInfluence of processing temperature on microhardness evolution, microstructure and superplastic behaviour in an Al-Mg alloy processed by high-pressure torsion.-
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