MARIANA XAVIER MILAGRE

Projetos de Pesquisa
Unidades Organizacionais
Cargo

Filtros

20182
Limpar filtros

Configurações

Fator de Impacto: 3.000 - 4.499 × Percentil: 75.00 - 100.00 ×

Resultados de Busca

Agora exibindo 1 - 2 de 2
  • Imagem de Miniatura
    Artigo IPEN-doc 25087
    Correlation between corrosion resistance, anodic hydrogen evolution and microhardness in friction stir weldment of AA2198 alloy
    2018 - DONATUS, UYIME; VIVEIROS, BARBARA V.G. de; ALENCAR, MAICON C. de; FERREIRA, RAPHAEL O.; MILAGRE, MARIANA X.; COSTA, ISOLDA
    Correlation between corrosion resistance, anodic hydrogen evolution and microhardness in the friction stir weldment of AA2198-T851 alloy has been investigated. Different microscopy techniques, scanning vibrating electrode technique (SVET) and potentiodynamic polarization tests were employed in the investigation. Unlike other 3rd generation Al-Cu-Li alloys where the regions that are most susceptible to corrosion are always within the weld region, the results reveal that the parent material is the most susceptible in this case. There is a direct correlation between corrosion resistance, anodic hydrogen evolution and microhardness in the weldment, and the T1 phase is associated with the direct correlation.
  • Imagem de Miniatura
    Artigo IPEN-doc 24759
    On the microstructure characterization of the AA2098-T351 alloy welded by FSW
    2018 - MILAGRE, MARIANA X.; MOGILI, NAGA V.; DONATUS, UYIME; GIORJAO, RAFAEL A.R.; TERADA, MAYSA; ARAUJO, JOAO V.S.; MACHADO, CARULINE S.C.; COSTA, ISOLDA
    The complex structure of the AA2098-T351 alloy welded by friction stir welding (FSW) was investigated by transmission electron microscopy (TEM), differential scanning calorimetry (DSC) and microhardness measurements. Thermal modelling process of the FSW process was carried out by soldering thermocouples at distances of 6, 9 and 12 mm from the weld centerline, and thermocouple measurements were used as input data into the model. Finite element software COMSOL v5.2 was used for data analysis. The prevailing phases in the base metal (BM) are T1 (Al2CuLi) theta' (Al2Cu), delta'/beta'(Al-3(Li,Zr)) and Omega (Al2Cu). In the heat affected zone (HAZ), either in the retreating or advancing sides, theta' phase was not identified. In the thermomechanical affected zone (TMAZ), T1, delta'/beta', GP zones phase were detected in the retreating side, whereas T1 and Guinier-Preston (GP) zones were not observed in the advancing side. This result supports the asymmetric behavior observed in the microhardness profile of the weld. In the stir zone (SZ), GP zones, T1, delta'/beta' (Al-3(Li,Zr)) and Omega were identified.