Atomic scale investigation of dynamic precipitation and grain boundary segregation in a 6061 aluminium alloy nanostructured by ECAP

被引：0
作者：
Sauvage, X. [1 ]
Murashkin, M. Yu. [2 ]
Valiev, R. Z. [2 ]
机构：
[1] Univ Rouen, Grp Phys Mat, CNRS, UMR 6634, F-76801 St Etienne, France
[2] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450000, Russia
来源：
KOVOVE MATERIALY-METALLIC MATERIALS | 2011年 / 49卷 / 01期
关键词：
aluminium alloy; precipitation; grain boundary segregation; ECAP; MECHANICAL-PROPERTIES; AL; MICROSTRUCTURE; STRENGTH; ENHANCEMENT; DIFFUSION; DUCTILITY; PROBE;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A commercial 6061 aluminium alloy was processed by ECAP and subsequently aged to nucleate nanoscaled precipitates within the ultrafine grain structure. The mechanical behaviour was investigated thanks to tensile tests and the microstructure was characterized at the atomic scale using Atom Probe Tomography. These experimental data clearly reveal that extensive dynamic precipitation and grain boundary segregation occurred during ECAP. These features lead to a significant increase of the strength of the alloy. Further ageing after ECAP processing gives rise to an additional increase of the strength linked to a larger precipitate density. A comparison of the morphology and the composition of precipitates nucleated during ECAP and during the standard T6 ageing treatment shows that the precipitation kinetic is affected by the severe plastic deformation.
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页码：11 / 15
页数：5
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