Influence of Magnesium on Mechanical Properties and Microstructure of Pure Aluminium

This paper deals with the influence of alloying with Magnesium of Pure Aluminium on their microstructure and Mechanical Properties. The additional level of magnesium is 2.5, 4.5, 6.5& 8.5 weight percent. The presence of Magnesium performed two types of event in liquid Aluminium. One of these is solid solution strengthening which is confirmed by the hardness & Tensile Testing. Another one is the formation of intermetallic phases like Al3Mg2 (β - Phase) by a eutectic reaction. As the amount of Mg increases Intermetallics of Al-Mg (β - Phase) is increases in developed alloy. These intermetallics are located at the grain boundary and pushed towards the grain boundary during solidification which is confirmed by Microstructural Analysis with the help of optical microscopy and Scanning electron microscopy. Grain size measurement was also carried out to understand the grain refining effect of Mg. Mg addition showed remarkable grain refinement from grain size no 1 to 6. As Magnesium content increases hardness and tensile value is increasing up to 4.5 wt% Mg after that large amount of β - Phase is formed which is brittle in nature which quite reduces hardness and tensile value.