| The effects of the addition of Nickel, Magnesium and Copper to Al-Si alloy on tensile strength, hardness, abrasion resistance and the coefficient of thermal expansion were studied. The results obtained in this study were as follows: 1) The tensile strength in Al-Si alloy showed a maximum when the amount of either Magnesium or Nickel content was 1%, on the other hand, tensile strength increased with an increase in cooper content. The tensile strength of the alloy containing 11% silicon content showed a maximum compared to that of other alloys with different amounts of silicon contents. 2) The hardness showed the highest value when Magnesium was added, and the next highest values were obtained in the order of Copper and Nickel added, respectively. As the amount of silicon content increased, the hardness showed to increase. 3) The abrasion resistance increased with an increase in the addition of elements and the order of effects of additional elements on the abrasion resistance was similar with the case in the hardness. As the amount of silicon content increased, the abrasion resistance showed to increase. 4) The addition of nickel yielded the lowest value of the coefficient of thermal expansion. However, magnesium seemed to show little effect on the coefficient of thermal expansion. |
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