발간논문

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Vol.36, No.9, 1421 ~ 1427, 1998
Title
Phase evolution and mechanical properties of Al-Nb MMC fabricated by rod - mill
김현재 , 최성배 , 권숙인 Hyun Jae Kim , Sung Bae Choi , Sook In Kwun
Abstract
Al-TM(transition metal) or Al-RE(rare earth element) MMC`s(metal matrix composite) exhibit high stability and strength at elevated temperatures because of low diffusion rate and solubility of alloying elements in Al. Particularly, Al-Ti and Al-Fe alloys have high strength, but low ductility. In this study, Al-Nb alloy was developed by rod mill as an alternative material. It was intended to produce Al MMC containing fine Al₃Nb intermetallics by hot extrusion of mechanically alloyed powders. Metastable BCC phase was found to form during mechanical alloying. This phase had similar lattice parameter and the same crystal structure with pure Nb. The structures of the hot extruded bars consisted of fine metastable BCC`s and equilibrium Al₃Nb`s in Al matrix. Al-5at%Nb alloy showed the strength of 567MPa and 154MPa at room temperature and 400℃, respectively.
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