ANALISIS PENGARUH PENAMBAHAN UNSUR MAGNESIUM (Mg) TERHADAP TINGKAT KEKERASAN, STRUKTUR MIKRO DAN KEKUATAN IMPACT PADA VELG ALUMINIUM (Al - 0,5% Si)

This study aims to: (1)Determine the effect of the addition of the element magnesium (Mg) in the aluminium casting on the level of hardness. (2) Determine the effect of the addition of the element magnesium (Mg) in the aluminium casting to micro structure. 3) Determine the effect of the addition of the element magnesium (Mg) in the aluminium casting on the level of impact strength. This study was descriptive research that clearly describes the results of experiments in the laboratory to some specimens. This method is implemented by providing independent variables intentionally to the object of study to know the effect on the dependent variable. The results showed three main things: (1) The more elements of magnesium (Mg) are added, the hardness value increased aluminium casting results.(2) The more elements of magnesium (Mg) is added, the grain size gets smaller aluminium casting results. (3) The more elements of magnesium (Mg) is added, then the impact strength aluminium casting results decline, but the decline is not too much