Micromechanical modelling of fracture toughness in overaged 7000 alloy forgings

In this article, a multiple micromechanisms-based model that quantitatively relates the plane-strain fracture toughness, K IC, of overaged 7000 alloy forgings to their microstructural attributes, fracture surface morphology and basic tensile properties is developed. To verify the proposed model, ext...

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Published inMaterials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 434; no. 1; pp. 339 - 346
Main Authors Cvijović, Z., Vratnica, M., Rakin, M.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 25.10.2006
Elsevier
Subjects
Aluminium alloys
Applied sciences
Elasticity. Plasticity
Exact sciences and technology
Fractography
Fracture modes
Fracture toughness
Fractures
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Modelling
Modelling
Aluminium alloys
Microstructure
Fracture modes
Fractography
Fracture toughness
Surface morphology
Rupture
Tensile property
Aluminium alloy
Micromechanics
Forging
Precipitation
Fracture mode
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Summary:In this article, a multiple micromechanisms-based model that quantitatively relates the plane-strain fracture toughness, K IC, of overaged 7000 alloy forgings to their microstructural attributes, fracture surface morphology and basic tensile properties is developed. To verify the proposed model, extensive microstructural and fractographic analyses along with mechanical tests are carried out using three industrially produced alloys with different contents of Fe and Si impurities. The fracture mechanisms are identified and individual contributions to the overall fracture are quantitatively assessed. The fracture toughness is then calculated using the experimentally obtained average values of relevant mechanical properties, area fractions of main fracture modes and microstructural parameters such as volume fraction of coarse intermetallic (IM) particles, their size and spacing, density of intragranular precipitates, number and width of the precipitate-free zones (PFZ). The proposed model correctly predicts the effect of individual microstructural parameters on the overall fracture behaviour.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2006.07.018