Structure-Property Correlation of Rolled ZM21/Al Magnesium Macrocomposite

Abstract:

Cast magnesium alloys are resulting coarse grained structure and micro porosity. In order to improve the formability and ductility in magnesium alloy, it is planned to incorporate aluminum wires as reinforcement through extrusion. In the present paper, ZM21/Al macrocomposites were fabricated by direct co-extrusion process. The extrusion was carried at 450°C with the extrusion ratio of 25:1. Metallurgical bonding of ZM21 magnesium alloy and aluminum was studied with the help of optical metallography and hardness testing. It was observed a white interface layer (intermetallic) formed in between magnesium alloy and aluminum. The same was confirmed by hardness test and SEM-EDS test. The co-extruded macrocomposite was again processed with unidirectional rolling and cross rolling to improve the bonding and grain refinement of the alloy. The composite was rolled at 250°C for 75% reduction in thickness. The microstructure and hardness of the rolled composite were characterized.

• Periodical: Materials Science Forum (Volume 710)
• Pages: 516-520
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.710.516
• Online since: January 2012
• Authors: M. Thirumurugan, T. Anka Rao, S. Kumaran, T. Srinivasa Rao
• Keywords: Co-Extrusion, Cross Rolling, Macro Composite, Uni-Directional Rolling, ZM21 Magnesium Alloy

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