Title: High strength potential of aluminium nanocomposites reinforced with nonperiodical phases

Authors: J. Nagy, M. Balog, K. Izdinsky, F. Simancik, P. Svec, D. Janickovic

Addresses: Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Racianska 75, 831 02 Bratislava 3, Slovak Republic. ' Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Racianska 75, 831 02 Bratislava 3, Slovak Republic. ' Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Racianska 75, 831 02 Bratislava 3, Slovak Republic. ' Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Racianska 75, 831 02 Bratislava 3, Slovak Republic. ' Institute of Physics, Slovak Academy of Sciences, Dubravska cesta 9, 845 11 Bratislava, Slovak Republic. ' Institute of Physics, Slovak Academy of Sciences, Dubravska cesta 9, 845 11 Bratislava, Slovak Republic

Abstract: Extrusion of rapidly solidified Al₉₄V₄Fe₂ ribbons and Al₉₄V₄Fe₂/Al powder mixtures was studied. TEM studies revealed microstructural heterogeneity in as-received ribbons containing α-Al, quasicrystalline, nanoscale amorphous and Al₁₀V intermetallic phases. Bulk profiles containing different amounts of cryo-milled Al₉₄V₄Fe₂ particles and Al powders were prepared via hot extrusion. Temperature was found to play the decisive role in the extrusion process. The lack of plasticity led to insufficient material flow during extrusion and was found responsible for the formation of macroscopic voids. Al₉₄V₄Fe₂ extruded bars exhibited quite satisfactory properties in compression tests, however preliminary failed in tensile tests due to insufficient consolidation. The addition of 1 mm Al powder into the Al₉₄V₄Fe₂ particles yielded extrusions at lower loads or at lower temperatures, resulting in composite samples with Al matrix reinforced with nanoscale nonperiodic phases. This approach appeared quite promising for the overall design of applicable technological routes inducing the non-periodic structures into bulk profiles.

Keywords: amorphous phase; bulk profile; mechanical properties; metal matrix composites; quasicrystal; rapid solidification; warm extrusion; aluminium nanocomposites; high strength; macroscopic voids; compression testing; tensile testing; nanoparticles; nanoscale nonperiodic structures.

DOI: 10.1504/IJMPT.2005.006591

International Journal of Materials and Product Technology, 2005 Vol.23 No.1/2, pp.79 - 90

Published online: 23 Mar 2005 *

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