Abstract The nanometer and uniform distributed in-situ γ-Al2O3 particles reinforced aluminum matrix composites have been successfully fabricated in the Al-Co3O4 components at 850 °C by means of direct melt reaction method.… Click to show full abstract
Abstract The nanometer and uniform distributed in-situ γ-Al2O3 particles reinforced aluminum matrix composites have been successfully fabricated in the Al-Co3O4 components at 850 °C by means of direct melt reaction method. The microstructure and properties of composites were investigated. The nanometer γ-Al2O3 distributes uniformly in the matrix and is assumed as γ-Al2O3 that is a stable phase of Al2O3 when the temperature is lower than 1000 °C. The Al/γ-Al2O3 interface is clean with certain matching degree. High density dislocation has been found around the nano γ-Al2O3 particles. At the grain boundary the submicron Al9Co2 particles exist, which can restrict the grain boundary moving. The tensile properties of 0.6 vol% γ-Al2O3 sample arrives at utmost while the 0.8 vol% sample decrease a lot due to the particle agglomeration.
Journal Title: Materials Letters
Year Published: 2019
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