Mechanical Response of Al-1.09Mg2Si Alloy under Varying Mould and Thermal Ageing Conditions
No Thumbnail Available
Files
Date
2012
Authors
Sekunowo, O.I.
Lawal, G.I.
Adeosun, S.O.
Journal Title
Journal ISSN
Volume Title
Publisher
Hindawi Publishing Corporation Journal of Metallurgy Volume 2012, Article ID 921235, 7 pages
Abstract
Samples of the 6063 (Al-1.09Mg2Si) alloy ingot were melted in a crucible furnace and cast in metal and sand moulds, respectively.
Standard tensile, hardness, and microstructural test specimens were prepared from cast samples, solution treated at 520◦C, soaked
for 6 hrs, and immediately quenched at ambient temperature in a trough containing water to assume a supersaturated structure.
The quenched specimens were then thermally aged at 175◦C for 3–7 hrs. Results show that at different ageing time, varied fractions
of precipitates and intermetallics evolved in the specimens’ matrices which affect the resulting mechanical properties. The metal
mould specimens aged for four hours (MTA-4) exhibited superior ultimate tensile strength of 247.8 MPa; microhardness, 68.5 HV;
elongation, 28.2% . It is concluded that the extent of improvement in mechanical properties depends on the fractions, coherence,
and distribution of precipitates along with the type of intermetallics developed in the alloy during ageing process.
Description
Keywords
Citation
Sekunowo, O.I. Lawal, G.I. Adeosun, S.O. (2012). Mechanical Response of Al-1.09Mg2Si Alloy under Varying Mould and Thermal Ageing Conditions. Hindawi Publishing Corporation Journal of Metallurgy; 2012: Article ID 921235, 1-7.