Precipitation kinetics in a severely plastically deformed 7075 aluminium alloy

In this paper we report a quantitative study, using small-angle X-ray scattering, of the precipitation kinetics during ramp heating and isothermal ageing in an AA7075 aluminium alloy processed by high-pressure torsion. The precipitation behaviour has been compared with that of the same material proc...

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Bibliographic Details
Published in:Acta materialia 2014-03, Vol.66, p.105-117
Main Authors: Deschamps, A., De Geuser, F., Horita, Z., Lee, S., Renou, G.
Format: Article
Language:English
Subjects:
Aging
Aluminium alloys
Aluminum base alloys
Applied sciences
Chemical Sciences
Crystal structure
Exact sciences and technology
Guinier Preston zone
High pressure torsion
Material chemistry
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Plastic deformation
Precipitates
Precipitation
Ramps
Severe plastic deformation
Small-angle X-ray scattering
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Summary:In this paper we report a quantitative study, using small-angle X-ray scattering, of the precipitation kinetics during ramp heating and isothermal ageing in an AA7075 aluminium alloy processed by high-pressure torsion. The precipitation behaviour has been compared with that of the same material processed in a conventional manner and observations are supplemented by transmission electron microscopy for precipitate and grain size characterization using automated crystal orientation mapping. After severe plastic deformation and natural ageing, the material is shown to contain a high density of GP zones. During ageing, the precipitate size distribution becomes bimodal, with small precipitates behaving similarly to those of the conventionally processed material and large ones associated with the crystalline defects and reaching large sizes at considerably lower temperatures and shorter times as compared to the conventionally processed material.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2013.11.071