Exemplary encapsulate feeding in stir casting for quality composites

Abstract

ABSTRACT The focus of this paper aims at addressing the contemporary issues, i.e., agglomeration and nonuniform dispersion of reinforcement particles prevailing with stir casting method of fabricating metal matrix composites. Although it has been dealt with different approaches, viable optimal technique has not evolved so far. A novel encapsulate feeding technique aimed to accomplish uniform dispersion of ceramic reinforcement particles. In this research, we have chosen Aluminum Alloy 6061 (AA 6061) as a matrix material and cubic boron nitride (c-BN) as a reinforcement companion to form a unique combination of advanced aluminum composites to prove this innovative feeding technique. Two percent of Mg added in every casting as a wetting agent to improve binding nature between metals and ceramics. The Aluminum Boron Nitride (Al/BN) composites are fabricated through bottom type of pouring stir casting machine. Metallographic characterization ensures uniform particle dispersion. The composites are tested using pin-fin apparatus and Xe-flash laser setup and found enhanced (12%) thermal properties than pure AA 6061.