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ISSN: 2169-0022

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Research Article

Effect of Overageing Conditions on Microstructure and Mechanical Properties in Al–Si–Mg Alloy

Vinokurov V1, Stavitskaya A1*, Chudakov Y1 and Lvov Y2

1Gubkin Russian State University of Oil and Gas, Moscow, Russia

2Louisiana Tech University, Ruston, USA

*Corresponding Author:
Stavitskaya A
Gubkin Russian State University of Oil and Gas
Moscow 119991, Russia
Tel: 74995078888
E-mail: [email protected]

Received Date: July 19, 2016; Accepted Date: September 23, 2016; Published Date: October 02, 2016

Citation: Vinokurov V, Stavitskaya A, Chudakov Y, Lvov Y (2016) Nanoconfined Reactions in Clay Nanotubes Based on Metal Salt Loading. J Material Sci Eng 5: 281. doi:10.4172/2169-0022.1000281

Copyright: © 2016 Vinokurov V, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Al-Si alloys have occupied significant position in the field of automobile applications. They are mainly used in engine parts where the alloys have to withstand high temperature for considerable length of time i.e., ageing effect. This research work has been carried out to investigate the overageing effect on a series of heat treatable Al-Si- Mg alloy (A355 alloy). The alloys were heat treated at 175°C for different length of time and microstructure and mechanical properties were studied. Considerable changes in microstructure were observed by SEM. Microstructure of moderately aged (1, 2 and 5 hours) alloys showed small precipitated particles, where over aged (1000, 10000 and 100000 hours) alloys showed coarse precipitated particles in grain boundary. Composition of the matrix and precipitated phase were ensured by EDS. These changes in microstructure significantly changed mechanical properties of the alloys over different ageing time. Initially the yield strength and hardness of the alloys increased up to a certain length of heat treatment and then it started to decrease with increasing heating time. Total elongation before fracture reduced initially and then increased with increasing heating time. Initially the dispersed second phase particles increased the mechanical strength. But eventually these properties decreased due to the coarsening of the particles. The study leads to the conclusion that the optimum aged was achieved between 3 to 5 hours of ageing time.


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