Fracture behaviour of an Al–Mg–Si industrial alloy

The tensile fracture behaviour of an Al–0.89 wt.% Mg 2Si industrial alloy is studied. It is found that the alloy deforms in a highly localised way only in the underaged (UA) state. In the peak aged (PA) condition the hardening precipitates are often by-passed by an Orowan mechanism, which predominat...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2001-04, Vol.302 (2), p.300-307
Main Authors: Urreta, S.E., Louchet, F., Ghilarducci, A.
Format: Article
Language:English
Subjects:
Aluminium alloys
Applied sciences
Exact sciences and technology
Fracture
Fractures
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Plasticity
Yield phenomena
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Summary:The tensile fracture behaviour of an Al–0.89 wt.% Mg 2Si industrial alloy is studied. It is found that the alloy deforms in a highly localised way only in the underaged (UA) state. In the peak aged (PA) condition the hardening precipitates are often by-passed by an Orowan mechanism, which predominates in the overaged (OA) state. In the UA condition, the stress concentration is shown to be large enough to nucleate cracks at the particle interfaces provided the shear strain has reached the critical value for cutting the precipitates into pieces. In the PA and OA conditions, failure results from coalescence of voids nucleated at large AlFeSi and smaller (Mg+Si) particles. It is shown that none of these particles are responsible alone for fracture. In contrast, ductility and rupture surfaces are consistent with a damage mechanism whose nucleation step is the coalescence of voids nucleated at large AlFeSi and neighbouring (Mg+Si) particles.
ISSN:0921-5093
1873-4936
DOI:10.1016/S0921-5093(00)01706-8