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Tailoring mechanical properties by grain refinement and particle redistribution |
| Malgorzata Lewandowska , Kinga Wawer , Krzysztof J. Kurzydlowski |
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Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland |
| Abstract |
Grain size refinement, in particular down to nanometer scale, causes a significant increase in mechanical strength. Among others, grain size refinement can be achieved via severe plastic deformation (such techniques as equal channel angular pressing, high pressure torsion, accumulative roll bonding and hydrostatic extrusion are commonly used in this context). In this study, an attempt was made to combine grain refinement with controlled particle redistribution and their size reduction in order to improve thermal stability and strength/ductility balance of nanostructured aluminium alloys. The results show coupling of these processes during severe plastic deformation. The resulting microstructures consist of nanoscale grains and uniformly distributed second phase particles. Changes in strength/ductility balance, impact fracture, fatigue strength and thermal stability are measured and discussed. |