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In this paper, the macro and micro-mechanical fracture behavior was studied for aluminum\ud(Al6061) alloy matrix, reinforced with various proportions of TiC particles such as 3wt%, 5wt% and 7wt%. The\udAl6061-TiC metal matrix composites were produced by stir casting method to ensure uniform distribution of\udthe TiC particulates in the Al matrix. The compact tension (CT) specimens were machined according to ASTM\udE399 specifications to evaluate the fracture toughness for Al6061-TiC metal matrix composites. The CT\udspecimens were machined for crack to width (a/W) ratio of 0.5 and thickness to width (B/W) ratios of 0.2 to\ud0.7 with an increment of 0.1. Load versus crack mouth opening displacement (CMOD) data was plotted to\udestimate stress intensity factor KQ for various thicknesses of the specimen. The fracture toughness KIC was\udobtained by plotting stress intensity factor versus thickness to width ratios of specimen data. The fracture\udtoughness of these composites varied between 16.4-19.2 MPa√m. Scanning Electron Microscope (SEM) studies\udwas made on the fractured surface of the specimens to understand the micro-mechanisms of failure involved in\udthese composites. Void initiation is more significant in the matrix near the interface. The micro-cracks grow\udfrom these micro-voids and crack propagates by linking these micro cracks locating the crack path preferentially\udin the matrix adjacent to the interface indicating ductile fracture

Experimental investigation of effect of specimen thickness on fracture toughness of Al-TiC composites