Transmission Electron Microscopy Study of Alumina Fiber-Reinforced Magnesium Composite.
ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
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A detailed microstructral analysis of alumina FP fiber-reinforced ZE41A magnesium composite was performed by means of transmission electron microscopy TEM. Fifty-five volume percent FP fiber-reinforced ZE41A magnesium composite thin foils were prepared by methods of mechanical polishing and ion thinning. Three major areas of interest in the composite microstructure were studied the filaments, the interface fibermatrix reaction zone, and the matrix. In addition, the effects of heat treatments at 450 C on the composite microstructure were investigated. It was found that the aluminamagnesium interface consisted of a thin layer of magnesium aluminum oxide spinel and relatively large magnesium oxide MgO particles. A concentric layer of magnesium alloy grains encircling the alumina the magnesium matrix microstructures. Upon heat treatment at 450 C for 95 hours, polygonization of the magnesium matrix occurred while the spinel interfacial layer grew with decreasing magnesium oxide particle size. Keywords Metal matrix composites, Aluminum oxides, Magnesium, Electron microscopy, Fiber Reinforced composites.
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