Characterization of Mechanically Alloyed Al5083 Alloy and Composite and Consolidation by Equal Channel Angular Pressing

Abstract:

In the present work a comparative study was carried out on consolidation of Al-5083 alloy and 5wt. % nanoyttrium oxide powders by Equal channel angular pressing (ECAP). The powders were milled for 10, 15 and 20 hrs using planetary ball mill under optimized process parameters. The milled powders were characterised by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Milled powders exhibit nanocrystalline single phase after 10hrs. The crystallite size after 20 hr of milling, alloy and composite powders were found to be 23nm and 57nm respectively. The 20hr milled alloy and composite powder was consolidated by equal channel angular pressing (ECAP) through 90^o die channel angle using route-A for two passes with and without back pressure. Density of ECAPed samples were measured using Archimedes principle. The highest density was found as 96% for the alloy after 2 passes without backpressure and sintering and 94% for the composite after 2 passes with back pressure and sintering.

• Periodical: Applied Mechanics and Materials (Volumes 764-765)
• Pages: 23-27
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.764-765.23
• Online since: May 2015
• Authors: G. Kondaiah, K. Chandra Sekhar, B. Chaithanyakrushna, Balasubramanian Ravisankar*, S. Kumaran
• Keywords: AL5083, Alloy, Composite, ECAP, Mechanical Alloying

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