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The Al-Si alloy matrix composite reinforced by γ-Al2O3 particles was produced by adding NH4AlO(OH)HCO3(AACH) into molten Al-Si alloy at 850 ℃. During stirring γ-Al2O3 particles are formed by the decomposing reaction of AACH. It is found that the γ-Al2O3 particles distribute more uniformly in the matrix by adding AACH than by adding γ-Al2O3 directly. The wear tests show that the volume loss of the unreinforced Al-Si alloy matrix is about 3 times larger than that of the γ-Al2O3 reinforced composites and that of the composites fabricated by adding γ-Al2O3 is larger than that by adding AACH.
The Al-Si alloy matrix composite reinforced by γ-Al2O3 particles was produced by adding NH4AlO (OH) HCO3 (AACH) into molten Al-Si alloy at 850 ° C. During stirring γ-Al2O3 particles were formed by the decomposing reaction of AACH. It is found that the γ-Al 2 O 3 particles distribute more uniformly in the matrix by adding AACH than by γ -Al 2 O 3 directly. The wear tests show that the volume loss of the unreinforced Al-Si alloy matrix is about 3 times larger than that of the γ-Al2O3 reinforced composites and that of the composites fabricated by adding γ-Al2O3 is larger than that by adding AACH.