Microstructure and corrosion behavior of as-quenched CuAl-based alloys

Autor(es)

Souza, J. S. ; Martins, C. R. ; Silva, L. S. ; Silva, R. A. G.

• Tipo de documento: Artigo Científico
• Fonte: Materials Chemistry and Physics; v. 282, p. 12-pg., 2022-03-06.

Resumo

The microstructure evolution, phase transitions, and corrosion behavior of the as-quenched Cu77.45Al22.55,Cu67.83Al22.24Mn9.93, and Cu75.76Al22.82Sn1.41 alloys were analyzed using differential scanning calorimetry, optical and scanning electron microscopy, X-ray energy dispersive spectroscopy, and microhardness measurements. The phase quantifications in as-quenched alloys were obtained from X-ray diffraction using the Rietveld method. The corrosion behavior of the alloys was also studied using electrochemical impedance spectroscopy and potentiodynamic polarization. The analyses revealed both Sn and Mn stabilized the beta phases in a wide temperature range. The martensitic transformation was shifted to a higher temperature interval due to the presence of Sn, while the manganese moved it to a lower temperature range, as compared with binary alloy. In addition, the Sn increased the effect of the Jerky step on the martensitic structure. The corrosion potential was reduced with Mn addition to the Cu-Al alloy. The Sn interfered with the corrosive behavior of the Cu77.45Al22.55 alloy. (AU)

• Processo FAPESP: 19/06717-0 - Estudo da estabilidade de fases em ligas multicomponentes
• Beneficiário: Ricardo Alexandre Galdino da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/51894-6 - RTI - 2011 - Plano anual de aplicação de parcela para custos de infraestrutura institucional para pesquisa
• Beneficiário: Maria Lucia Oliveira de Souza Formigoni
• Modalidade de apoio: Auxílio à Pesquisa - Reserva Técnica para Infraestrutura Institucional de Pesquisa