Effect of process variables on structure and properties of aluminium–silicon piston alloy

Haque, Mohafizul Md and Maleque, Md. Abdul (1998) Effect of process variables on structure and properties of aluminium–silicon piston alloy. Journal of Materials Processing Technology, 77 (1-3). pp. 122-128. ISSN 0924-0136

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Abstract

The majority of automotive pistons are cast in one of the groups of low expansion Al–Si eutectic alloys. The structure and mechanical properties of these alloys are highly ependent upon cooling rate, composition, modification and the heat-treatment operations. The effect of these variables were investigated in this study, using locally available automotive ‘scrap pistons’ as basic raw materials. Strontium master alloy was used as the source of the modifier and a natural-gas-fired crucible furnace was used for melting purposes. The microstructures of the alloy, both in the modified and unmodified conditions, were studied in this investigation. Properties such as the ultimate tensile strength (UTS), percentage elongation, hardness and percentage porosity for both rates of cooling have been determined, both with and without the addition of strontium. Significant changes in structures were observed to occur, especially in the primary and eutectic silicon phases. Full heat treatment has also shown a great influence on the structure and properties of the aluminium–silicon piston alloy. The residual stress in the modified alloy is fully relieved due to thermal treatment. Finally, attempts were made to correlate the observed structures and properties obtained during the experiment.

Item Type:	Article (Journal)
Additional Information:	6103/29636
Uncontrolled Keywords:	Process variables; Eutectic alloys; Piston alloy
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN600 Metallurgy T Technology > TS Manufactures > TS200 Metal manufactures. Metalworking
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Prof Dr. Md Abdul Maleque
Date Deposited:	25 Jul 2013 10:51
Last Modified:	25 Jul 2013 10:51
URI:	http://irep.iium.edu.my/id/eprint/29636

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