Abstract
Al7075 alloy is the most commonly used by the aerospace industry. Al7075 alloy is characterized by its improved properties such as higher toughness, specific strength and hardness. The current work focuses on the preparation and characterization of age hardened Al7075-Grey cast iron composites. Two stage stir casting technique is used for the preparation of the composite. Age hardening treatment is imparted to enhance the mechanical characteristics. The variation of hardness and tensile strength with respect to aging temperature and percentage of reinforcement is analyzed. The composites exhibit higher hardness and tensile strength as the reinforcement percentage is increased at an aging temperature of 1000C.
Highlights
Composite material is a combination of dissimilar materials which result in property enhancement than those of the individual elements
Al 7075 alloy can be successfully reinforced with grey cast iron powder using two step stir casting technique
Substantial improvement in the bulk hardness is observed in the composite with increase in the weight percentage of reinforcement
Summary
Composite material is a combination of dissimilar materials which result in property enhancement than those of the individual elements. Enhancement in the desirable properties is mainly due to the reinforcement which is generally harder, refractory, and stiffer than the base material [5]. Metal matrix composites can be defined as a combination of two or more dissimilar materials, one of which is a metal, in which enhancement of desirable properties are achieved by systematic combinations of different constituents [6,7,8]. Aluminum alloy composites are hardened by reinforcement of ceramic refractory particulates into the base matrix material. Due to their innate nature and creation of nucleation sites in the matrix material, reinforcements can enhance tensile related properties of the matrix material [10,11,12]. The graphite provides gray cast iron with an additional damping capacity for the alloy or matrix since it absorbs the energy [21,22,23]
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