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논문 기본 정보

자료유형
학술저널
저자정보
Saeed Pashmforoosh (Islamic Azad University) Sadegh Shahriyari (Islamic Azad University) Omid Mirzaee (Islamic Azad University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.8
발행연도
2021.1
수록면
3,026 - 3,038 (13page)

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초록· 키워드

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In this study, the vortical casting used to increase the wettability of ceramic particles, which is an obstacle to achieving auniform distribution of reinforcing particles in the matrix. The effect of magnesium modifier on the mechanical properties,fracture mechanism, porosity, and surface morphology of A356 aluminum matrix composite reinforced with nano-alumina–micro-copper reinforcing particles investigated. Alumina nanoparticles and copper microparticles milled, and the resultingpowder mixture was added to the aluminum melt in a vortical casting process to produce A356/1.5 vol% nano Al2O3/Cucomposite and subsequently various amounts of magnesium added to the melt. The results of this study showed that with theaddition of reinforcing nanoparticles as well as magnesium, the porosity increased, the highest amount of which in compositecontaining 10% volume of magnesium equals 2.8%. The optimum amount of magnesium that made the composite structureuniform was 7%. Also, the addition of magnesium reduced the hardness oscillations throughout the sample, and the highesthardness reported to be 141.2. The presence of a 7% volume of magnesium in the composite showed the ultimate strengthof 190.2 and yield strength of 130.3. Finally, according to the results, the composite fracture mechanism was controlled bythe fracture of the interface between the reinforcing particles and the matrix.

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