Fabrication of magnesium foam and magnesium nano Al2O3 composite foam using powder metallurgy method
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Date
2016-06
Authors
Nurul Syazwani Balqis Bt Azman
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Abstract
Magnesium foam and magnesium nano alumina composite foam using carbamide as space holder were fabricated via powder metallurgical method. The fabrication process involved two steps. The first step involved the fabrication of magnesium foam using various percentage of carbamide (30%, 50 % and 70 wt.%.) and different processing methods. Three different processing methods; single sintering, double sintering and sintering dissolution process (1, 2 and 3 hours dissolution time) used to fabricate the magnesium foam. Then magnesium composite foam was fabricated using the optimum parameter from magnesium foam fabrication. The magnesium composite foam was produced using sintering dissolution process (2 hours dissolution time) with addition of 0.5, 1.0, 1.5 and 2.0 wt.% of nano alumina with 30 wt.% amount of carbamide. Both magnesium foam and magnesium nano alumina composite foam were characterized for density, porosity, pore size and morphology, compressive strength and energy absorption. Among the three processing methods for magnesium foam, the sintering dissolution method with 2 hours dissolution time showed the highest compressive strength and energy absorption with optimum density and porosity. Magnesium foam with 30 wt.% carbamide using 2 hours sintering dissolution process showed the highest value of compressive strength and energy absorption with porosity in the range of 37%-53% with a pore size of 3.26 to 3.70 mm. Magnesium composite foam with 1.5 wt.% nano alumina showed the highest value of compressive strength and strain energy absorption with porosity in the range of 30%-40% with a pore size of 3.08 to 5.34 mm.