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Erschienen in:
01.11.2012 | Ultrafine Grained Materials
Effects of ball milling and high-pressure torsion for improving mechanical properties of Al–Al2O3 nanocomposites
Erschienen in: Journal of Materials Science | Ausgabe 22/2012
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Abstract
Pure Al powders were mixed with a 30 % volume fraction of Al2O3 powders having particle sizes of ~30 nm. The mixed powders were first subjected to ball milling (BM) and thereafter consolidated by high-pressure torsion (HPT) at room temperature under a pressure of 3 GPa for 10 turns. The Al–Al2O3 composite produced by BM and HPT (BM + HPT) had a more uniform dispersion of the nano-sized Al2O3 particles in the Al matrix. Hardness values of the BM + HPT composites were higher than those of the composites without BM. It is shown that the use of BM powders for HPT is more effective in achieving a uniform dispersion of the nano-sized Al2O3 particles and in improving mechanical properties of the Al–Al2O3 nanocomposites.