Microstructure and fatigue properties of extruded aluminum alloys 7046 and 7108 for automotive applications

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dc.contributor.authorHattori C.S.
dc.contributor.authorAlmeida G.F.C.
dc.contributor.authorGoncalves R.L.P.
dc.contributor.authorSantos R.G.
dc.contributor.authorSouza R.C.
dc.contributor.authorda Silva W.C.
dc.contributor.authorCunali J.R.C.
dc.contributor.authorCouto A.A.
dc.date.accessioned2024-03-12T19:19:18Z
dc.date.available2024-03-12T19:19:18Z
dc.date.issued2021
dc.description.abstract© 2021 The AuthorsThis work aimed to obtain by extrusion two aluminum alloys, 7108 and 7046. The microstructural characterized at each stage of the manufacturing process and the mechanical fatigue behavior of the extruded profile were evaluated. The aluminum alloys in the as-casted condition exhibited an interdendritic microsegregation inside the grains, with intermetallic phases precipitated on the grain boundaries. In the homogenization of the billets of the AA7108 and AA7046, the precipitated phases dissolved. The AA 7046, in the as-casted condition, displayed shrinkage microvoids throughout the length of the billet and a microstructure of heterogeneous grains, with the presence of a remelted layer at a maximum depth of 10 mm. The AA7046 displayed better tensile and fatigue properties than the AA7108. A higher surface roughness facilitated the initiation and propagation of cracks during the fatigue cycles. This effect was more pronounced with low levels of maximum stress and high number of cycles to failure. Deep secondary cracks perpendicular to the growth direction of the main crack were visible on all fracture surfaces. In the medium and high cycle fatigue tests of the AA7108 and AA7046, the cracks advanced in a perpendicular direction to the elongated grains resulting from the extrusion process. The fracture surfaces of the tested samples with a high number of cycles exhibited a region with a smaller crack propagation area and a larger region of rupture due to mechanical overload. The region of crack propagation is characterized by plastic deformation and the presence of striations perpendicular to the growth direction.
dc.description.firstpage2970
dc.description.lastpage2981
dc.description.volume14
dc.identifier.doi10.1016/j.jmrt.2021.08.085
dc.identifier.issn2238-7854
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/34595
dc.relation.ispartofJournal of Materials Research and Technology
dc.rightsAcesso Aberto
dc.subject.otherlanguageAA7046
dc.subject.otherlanguageAA7108
dc.subject.otherlanguageAluminum alloys
dc.subject.otherlanguageExtrusion
dc.subject.otherlanguageFatigue
dc.titleMicrostructure and fatigue properties of extruded aluminum alloys 7046 and 7108 for automotive applications
dc.typeArtigo
local.scopus.citations16
local.scopus.eid2-s2.0-85114130521
local.scopus.subjectAa7046
local.scopus.subjectAa7108
local.scopus.subjectAutomotive applications
local.scopus.subjectCondition
local.scopus.subjectExtruded aluminum
local.scopus.subjectFatigue properties
local.scopus.subjectFracture surfaces
local.scopus.subjectGrowth directions
local.scopus.subjectMicro-structural
local.scopus.subjectMicrostructures properties
local.scopus.updated2024-12-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85114130521&origin=inward
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