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Wear Behavior of Al-Mg2Si Cast In-situ Composite
J. Ghiasinejad,M. Emamy,M. R. Ghorbani,A. Malekan 한국소성가공학회 2010 기타자료 Vol.2010 No.6
Al-Mg₂Si in situ composites are great candidates for automobile brake discs due to their low density, reasonably high young"s modulus and low thermal expansion coefficient. Thus, understanding wear properties of this composite is of a great importance. In this study wear behavior of an in-situ Al-Mg₂Si composite, prepared from a simple casting route, has been investigated using a pin-on-disc configuration concerning the effect of Mg₂Si volume fractions, 15, 20 and 25% respectively. It was found that the weight loss increases with increase in reinforce volume fraction which can be due to a coarse morphology of primary Mg₂Si particles. It was found that the variations of weight loss with sliding distance comprise different regimes of which the mechanisms are discussed.
The Effect of Li Additions on Wear Properties of Al-Mg₂Si Cast In-situ Composites
M. R. Ghorbani,M. Emamy,J.Ghiasinejad,A. Malekan 한국소성가공학회 2010 기타자료 Vol.2010 No.6
Wear rate of a modified Al-Mg₂Si composite was studied by the use of a conventional pin-on-disc technique. In-situ Al-Mg₂Si composites (15, 20, 25 wt.%) were cast in a simple cylindrical mold. 0.3 wt.% Li was added into the molten composite to modify its microstructure. It has been found that Li addition decreases the mean size of primary Mg₂Si particles. The wear behavior of different composites at different rates revealed that Li addition increases the wear properties of Al-15%Mg₂Si to some extent but it did not have any significant influence on wear properties of two other composites.
A. Malekana, M. Emamy,M. Emamy,J. Ghiasinejad,M.R.Ghorbani 한국소성가공학회 2010 기타자료 Vol.2010 No.6
An isothermal reheating approach was used to study the effect of isothermal holding time on the microstructure of Al-Mg₂Si in-situ cast composite. Process temperature was selected at 590℃ which is in the semi solid state with respect to the phase diagram of Al-Mg₂Si system. The morphology of primary Mg₂Si particles was identified as irregular shape. The microstructures of the composite at two different states of reheated and as-cast, were compared to reveal the degree of particle modification. The results showed that higher holding time have more significance influence on the nodularity and also decreasing the size of primary Mg₂Si particles. An optimum time was also obtained for isothermal reheating processwhich can be affected by different parameters discussed in this work.