| Aluminum alloy matrix composites containing 1 or 3 w/o of Al₂O₃ and SiC particles range in size from 0.3㎛ to 53㎛ were prepared by "Compocasting process." The non-metallic particles were uniformly distributed in the cast composites. The cast composite ingots can be fabricated to thick plate with 6㎜ thickness by hot forging and rolling, and the non-metallic particles initially uniformly distributed in matrix alloy were aligned along the working direction. Tensile tests conducted at room temperature and 250℃ show that in samples with 0.3㎛, l㎛ Al₂O₃ both yield and tensile strengths have increased, but in samples with 38㎛, 58㎛ SiC only high temperature tensile strength has increased over those of matrix alloy. Especially, the increase of room temperature yield strength and high temperature UTS was noticeable. |
|
