Structure and properties of aligned short fibre-reinforced intermetallic matrix composites
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Powder injection moulding techniques were utilized to align short fibres (Al2O3 and SiC) in a variety of intermetallic matrices (NiAl, MoSi2 and TaTiAl2). The alignment was accomplished by extruding a mixture of powders and short fibres with a polymer-based binder through a constricting nozzle. The binder was removed and the powder and fibres were consolidated, producing an aligned short fibrous composite. The effects of powder morphology, fibre volume fraction and fibre diameter on the alignment were demonstrated. Small diameter powders were required to ensure alignment of an appreciable loading of fibres in a powder matrix. Tensile and hardness tests were used to evaluate the effectiveness of the aligned short fibres to strengthen and toughen the matrices. The mechanical behaviour of these aligned short fibrous composites were found to be comparable to similar aligned continuous fibrous composites produced by conventional techniques.
KeywordsAl2O3 NiAl Matrix Composite Fibre Diameter Hardness Test
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