Title: Experimental investigations on optical and mechanical properties of cast Al-8Mg alloy processed by equal channel angular extrusion

Authors: Swami Naidu Gurugubelli

Addresses: Department of Metallurgical Engineering, JNTUK College of Engineering, Vizianagaram, Andhra Pradesh, India

Abstract: Ultrafine grained microstructures have got much scientific importance and equal channel angular extrusion is an innovative technique for developing such microstructures. The equal channel angular extrusion method consists of two channels that intersect at an angle, generally comprised between 90° and 135°. The billet is extruded through the channels and the deformation is obtained. The cross-section of the billet remains constant during the process and hence the process can be repeated for many cycles. Very high strains can be accumulated in the billet and hence the process allows us to produce ultrafine grained microstructures with improved mechanical properties. In the present investigations Al-8Mg alloy is produced by melting and casting. The casted alloy is processed by equal channel angular extrusion and the mechanical and optical properties are studied. The improvement in mechanical properties after equal channel angular extrusion is determined using Vickers micro hardness and tensile tests.

Keywords: mechanical properties; casting; aluminium alloys; magnesium; equal channel angular extrusion; optical micrographs; Vickers microhardness; yield strength; ultrafine grained microstructure; cast alloys.

DOI: 10.1504/IJMATEI.2016.077313

International Journal of Materials Engineering Innovation, 2016 Vol.7 No.1, pp.26 - 32

Received: 06 Feb 2015
Accepted: 21 Sep 2015

Published online: 24 Jun 2016 *

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