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| Home > Institute Collections > PGI > PGI-5 > Microstructural and macroscopic aspects of the plasticity of complex metallic alloys |
| Report | PreJuSER-136058 |
2008
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/3229
Report No.: Juel-4281
Abstract: Complex metallic alloys (CMAs) represent a class of materials which are based on crystal structures with exceptionally large unit cells comprising up to more than a thousand atoms. As a result of the structural attributes of these phases, their plastic deformation behaviour features significant differences to conventional mechanisms known from structurally simple materials. In the present work, the plasticity of the three CMA phases, hexagonal μ-Al-Mn, body-centred cubic Mg$_{32}$(Al,Zn)$_{49}$, and face-centred cubic $\beta$-Al-Mg was investigated. Uniaxial deformation experiments on single crystalline samples of these alloys were carried out and thermodynamic activation parameters of the deformation processes were determined. Microstructural investigations by means of transmission electron microscopy (TEM) were carried out on μ-Al-Mn and Mg$_{32}$(Al,Zn)$_{49}$. The underlying deformation mechanisms of these phases were completely determined. Dislocation climb and associated diffusion of vacancies was found to play an essential role in the deformation processes of both materials.
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