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Journal of Experimental & Applied Mechanics Original Research

Effect of Thermal Conditions on Microstructure and Mechanical Properties of AA5083 Processed by Equal Channel Angular Pressing

  1. Nagendra Singh Department of Mechanical Engineering, Institute of Engineering and Technology, Dr. Bhimrao Ambedkar University, Swami Vivekanada Campus
  2. Sanjeev Kumar Verma Department of Mechanical Engineering, Central Instrumentation Facility, Research and Development Cell, Lovely Professional University

Abstract

A commercial AA5083 with an initial grain size of 210 μm was given an ultrafine-grained structure using the equal channel angular pressing (ECAP) technique under die design as patented. The identical sample underwent two successful passes through the die at 473 K, with each passage causing the sample to rotate 90° along its own longitudinal axis. After just one pressing, the microstructure was comparatively homogeneous. It was made up of elongated substructure parallel bonds that were 0.9 μm in length and 0.3 μm in breadth on average. Two passes yielded an equiaxed super fine-grained structure of 0.4 μm in the current alloy. The minuscule granules maintained their thermal stability at 548 K. The yielding strength of the as received AA5083 was 132 MPa; however, after one pressing, it rose to 252 MPa, and after two passes, it reached 293 MPa, which was higher than the yield stress of a typical AA5083. The AA5083, with a 0.4 μm grain size, was found to exhibit superplastic-like behavior below 548 K, with an elongation to failure of almost 210%. Using ECAP at 498 K, AA5083 was treated in this study to yield an ultrafine particle size of roughly 210 nm.

Keywords

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