Experimental Studies of Self Healing Behaviour of Under-Aged Al-Mg-Si Alloys and 60Sn-40Pb Alloy Reinforced Aluminium Metal-Metal Composites
- 1 Department of Metallurgical and Materials Engineering, Federal University of Technology, Akure, Nigeria
- 2 Department of Metallurgical and Materials Engineering, Federal University of Technology, Akure, Nigeria
- 3 Department of Mining and Metallurgical Engineering, Faculty of Engineering Campus, University of Namibia, Ongwediva, Namibia
Abstract
Experimental studies to demonstrate self healing potentials of Al-Mg-Si alloy were undertaken in this research work. Self healing exploring secondary precipitation in the Al-Mg-Si alloy and use of low melting metallic alloy reinforcement (60Sn-40Pb alloy) were used as basis for the investigation. For the precipitation study, the Al-Mg-Si alloy was under-aged at temperature of 160 o C for 10 minutes and then subjected to second step ageing treatment at four different temperatures within the range of 25 o C and 70 o C. In the 60Sn-40Pb alloy reinforced Al-Mg-Si alloy study, the samples were prepared in pre-cracked state and then subjected to healing heat-treatment at 250 o C. For all cases tensile test and healing efficiency was used to analyze the results generated. It was observed that a second step thermal ageing at 50 o C resulted in peak improvement in tensile strength, yield strength, toughness and percent elongation while ageing above this temperature lead to a drop in the tensile properties in comparison to that of the sample not subjected to a second ageing treatment. Also the use of 60Sn-40Pb alloy as reinforcement in the Al-Mg-Si alloy resulted in a healing efficiency of 91% after pre-cracking and heat-treatment. The satisfactory bonding between the 60Sn-40Pb alloy and the Al-Mg-Si alloy matrix contributed to the high healing efficiency observed.
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