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Microstructure and mechanical properties of binary Al-Li alloys processed by ECAP

Jarosław Mizera 1,  Malgorzata Lewandowska 1,  Aleksandr Korznikov 2,  Krzysztof J. Kurzydlowski 1

1. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
2. Institute for Metals Superplasticity Problems, Russian Academy of Science, Ufa, Russian Federation

Abstract


Microstructure and mechanical properties of binary Al-Li alloys processed by equal channel angular pressing (ECAP) were investigated. The study was carried out on two model Al-0,7wt.%Li and Al-1,6wt.%Li alloys. Specimens in the form of rods were subjected to severe plastic deformation up to strain values of 4,6 and 9,2.
A significant grain refinement, from the grain size of 300 μm in an initial state in both alloys to the grain size below that 1 μm has been observed in deformed material. A quantitative analysis of the microstructure and the mechanical properties in both initial and deformed state was also performed. It has been found that the yield stress increases from 40 MPa in the initial state to 190 MPa after deformation. The effect of lithium content on microstructure refinement and mechanical properties was also investigated.

 

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Presentation: poster at E-MRS Fall Meeting 2003, Symposium G, by Jarosław Mizera
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-06-17 13:20
Revised:   2009-06-08 12:55