Abstract
This experimental research portrays the impact of strontium seen on hardness and impact strength of Al-1.0%mn-12%Si alloy. Strontium was added with respect to the amount of silicon present in the alloys (12% of Si; 0.02-0.03% of Sr) and 1.0% manganese which serves as a modifying agent). Higher amount of aluminum and silicon were dissolved and cast as cylindrical ingots. Impact and Hardness test were tested using charpy impact testing machine and Rockwell hardness testing machine (ASTM E18-11) respectively. The addition of Sr appears to decline as soon as the addition exceeds the 0.026% level which shows negative effect to the mechanical properties because of the presence of some compounds like Al4SrSi2 and releases of brittle Al3SrSi3 phase are bound to set and coarsening of the eutectic silicon can occur which will reduce the properties of the alloy causing them to revert to values more typical of unmodified material. The results showed that when strontium was used as a modifier to modify eutectic Al-Si alloy modifies the Al-Si, that the morphology of the alloy changed that lead to positive enhancement/increment in mechanical properties of the alloy.
Highlights
Aluminum becomes the common structural material because of following properties: less weight, less energy needed to fabricate and machine, not affected by atmospheric corrosion, good thermal as well as electrical conductivities, high metallic soft glow and its non to conduct and non-shine in nature [2]
Aluminum alloys are becoming important in the industry because of the way it combines with the properties of base alloy
The materials used for alloy preparation, casting of test bars and testing are: aluminium, silicon, manganese, strontium, Weighing machine, Mild steel pot and laboratory size tungsten-arc electric furnace for melting
Summary
Aluminum becomes the common structural material because of following properties: less weight, less energy needed to fabricate and machine, not affected by atmospheric corrosion, good thermal as well as electrical conductivities, high metallic soft glow and its non to conduct and non-shine in nature [2]. One of the main reasons for using these alloys to make high-quality castings is eutectic modification, which was accidentally discovered by AladarPacz in the 1920's while using an alkali-fluoride treatment in Al-Si melts This treatment results in a considerable improvement in mechanical properties, especially elongation by altering the form of the silicon which is a major constituent of these alloys and plays a significant role in determining the mechanical properties of the alloys. The best method improving the stability of aluminum-silicon alloy usage in the industry is to improve the mechanical properties by making sure that Al-Si is structurally sound and dimensionally accurate during castings and when the parts are been fabricated at reduced price. The improvement in mechanical properties of the cast Al-Si alloy is as a result of the change in the form, shape, structure and size of the eutectic silicon phase particles [15].
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