Abstract
This paper deals with the study of Mechanical properties (Percussion resistance, Ultimate and Yield strength) of cast alloy Cu2Mg8Si6Al5. It has been developed by addition of Al-Cu-Si with 83.334% Al, 16.23% Cu and 0.165% Si. Solidification of Al-Cu-Si alloys has been realized by melting of industrial and machine shop scrap in a pit type resistance furnace with a clay graphite crucible and casting in green sand moulds at maximum temperature of 640°C. The outcome final castings were then machined according to ASTM-A 370 standards for the percussion, ultimate and yield strength of specimen. The results on the basis of various trails of microstructure and practical approach depicted that Cu and Si addition increased the Percussion strength as well as Ultimate and Yield strength for the alloy, while iron addition reduces. However, addition of manganese neutralized the detrimental effects of the iron, which presented in the industrial scrap. The results are given a good agreement with the existing literature on alloys which can be widely used for industrial applications like automobile, aero space, defence etc.
Highlights
Aluminium, Copper and Silicon foundry alloys are the most commonly used alloys in the automotive, defence and aerospace industries mainly because of their high strength to weight ratios and excellent cast ability which makes them potential candidates for a number of tribological applications in automobiles and other engineering sectors [1,2,3,4,5]
The present experimental work confirms that addition of grain refiner (1wt%Al-0.011Mn-0.132Cr) to Cu2Mg8Si6Al5 alloy significantly refines the coarse columnar primary αAl grains to fine equated α-Al grains due to the presence of AlCr2/TiCr2 particles present in the master alloy which are nucleating agents during the solidification of α-Al dendrites, while the eutectic silicon particles appear to be unaffected as expected
The results suggest that the addition of Al-0.011Mn-0.132Cr master alloy along with Ti modifier to Cu2Mg8Si6Al5 cast alloy shows more uniformly distributed α-Al dendrites, fine silicon and CuAl2 particles in the inter dendrite region compared to the individual addition of grain refiner or modifier
Summary
Copper and Silicon foundry alloys are the most commonly used alloys in the automotive, defence and aerospace industries mainly because of their high strength to weight ratios and excellent cast ability which makes them potential candidates for a number of tribological applications in automobiles and other engineering sectors [1,2,3,4,5] They present good wear resistance; high welding characteristics and good surface finish [6]. For instance Silicon is known to improve fluidity and reduce solidification shrinkage improving cast ability of Silicon based aluminium alloys [9] It increase strength until the eutectic level percentage is reached. Magnesium is known to have a similar effect to copper
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