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논문 기본 정보

자료유형
학술저널
저자정보
H. Rostami (University of Tehran) M. Emamy (University of Tehran) J. Rasizadeh Ghani (University of Tehran) B. Pourbahari (University of Tehran)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.8
발행연도
2021.1
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2,682 - 2,695 (14page)

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The microstructures, hardness and tensile properties of Al–AlSb-xCu in situ composites have been studied where the amountof Sb was 10 wt% and Cu contents were 1, 3, 5, 7 and 10 wt% Cu. Microstructural studies indicated that depending Cucontent, the crystals of primary AlSb alter seriously in shape and size, and also a new Cu-intermetallic (Al2Cu) is formedin the as-cast microstructure. Although T6 heat treatment did not afect primary AlSb phase, extrusion process refned itthrough fragmentation mechanism. A uniform microstructure including well distributed fne primary AlSb particles wasfound by adding 5 wt% Cu to the Al–AlSb composite, as an optimum content. The variation of hardness results with Cuaddition showed an increasing trend, while tensile testing examinations revealed that by exceeding Cu content (>5 wt%),the ultimate tensile strength (UTS) of the composites is reduced in both as-cast and T6 states. The efect of heat treatment onelongation improvement of the extruded composite was positive; however, it was reverse in as-cast condition, since extrudedspecimens showed a better response to removing the CuAl2 phase in the eutectic region during heat treatment. Remarkableenhancement in the UTS and elongation values of the extruded specimens, before and after heat treatment, was attributed tothe extensive fragmentation of intermetallic phases and well distributed fne particles in the matrix which provided properobstacles for dislocation motion. The fracture behavior of intermetallics in as-cast specimens showed more cleavage fracturein comparison with extruded and heat treated composites which demonstrated more dimples.

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