Microstructural Characteristics of the Al Alloys: The Dissimilarities Among the 2XXX Alloys Series used in Aircraft Structures

Autor(es)

de Sousa Araujo, Joao Victor ; Milagre, Mariana Xavier ; Ferreira, Raphael Oliveira ; de Souza Carvalho Machado, Caruline ; de Abreu, Caio Palumbo ; Costa, Isolda

• Tipo de documento: Artigo Científico
• Fonte: METALLOGRAPHY MICROSTRUCTURE AND ANALYSIS; v. 9, n. 5, p. 15-pg., 2020-10-15.

Resumo

Microstructure characteristics of two high-strength aluminum alloys, the 2024-T3 Al-Cu-Mg, and the new generation Al-Cu-Li alloy 2198, in the T8 and T851 tempers, were investigated in this study. For this purpose, microstructural and statistical analyses were carried out. The results showed equiaxed grains for the 2024-T3 and 2198-T851 alloys, whereas, elongated grains for the 2198-T8. Besides, the 2198-T851 alloy displayed slip bands in the grains due to the stretching stage, "51". The 2024-T3 alloy showed at least two types of constituent particles, Al-Cu-Mg and Al-Cu-Mn-Fe-(Si); whereas Al-Cu-Li alloys showed only one type, Al-Cu-Fe, in their composition. Statistical analyses showed that the percentage of area covered by constituent particles was larger in the 2024-T3 alloy compared to the 2198 in both tempers, T8 and T851. On the other hand, the Al-Cu-Li alloys showed higher microhardness values relatively to the Al-Cu one. The differences among the nanometric phases present in Al-Cu and Al-Cu-Li alloys were analyzed by transmission electron microscopy. All the results were related to the different chemical composition and industrial thermomechanical processing of each alloy. (AU)

• Processo FAPESP: 19/18388-1 - Efeito da microestrutura de ligas de Al de alta resistência na formação e comportamento frente à corrosão da camada anodizada
• Beneficiário: João Victor de Sousa Araujo
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/13235-6 - Estudo da corrosão localizada e caracterização da resistência à corrosão associada à fadiga na região de solda em ligas de alumínio de elevada resistência soldadas por fricção (FSW)
• Beneficiário: Isolda Costa
• Modalidade de apoio: Auxílio à Pesquisa - Temático