Effects of heat treatment on microstructure and mechanical properties of twin roll casted Al-5.5Mg-0.02Ti alloy

Abstract

In the present investigation the Al-5.5Mg-0.02Ti alloy produced by twin roll casting (TRC) process (varying rolling speed, i.e., 3, 4, and 5 rpm) has been subjected to heat treatment for microstructure modification. Grain coarsening at the center of the strip has been observed during heat treatment process. Homogeneous microstructure of the alloys has been achieved by heat treatment process, and it has been found that the time to achieve homogeneous structure depends on the rolling speed. Transmission electron microscope (TEM) studies revealed that undesired Mg rich phase (Mg(5)Al(8)) has been successfully eliminated by heat treatment process. Fine and equi-axed grains in the alloys obtained by heat treatment process shows high strength and elongation. Crown Copyright (c) 2009 Published by Elsevier Ltd. All rights reserved.