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To the Al6061 matrix composite, the monazite structure Lanthanum Phosphate with a weight ratio of 15% is added as the reinforcement. The machinability characteristics of the stir cast composite is predicted using Abrasive Waterjet Machine. Jet Pressure, Stand-Off Distance, and Cutting Speed are taken as independent parameters. Material Removal Rate, Kerf taper Angle, and Surface Profile Roughness are taken as the dependent responses. The influence of the machining parameters is investigated using the Taguchi's L27 orthogonal array through ANOVA table for both single response and multi responses problems by Gray Relational Approach. From the single response study, the jet pressure has significant impact on material removal and kerf angle whereas, the surface finish depends on the cutting speed. For the multi-response problems, stand-off distance shows the superior influences on the output responses followed by jet pressure and cutting speed.

In the Al6061 matrix composite, 15% weight percent of lanthanum phosphate (LaPO4) is added as a reinforcement to prepare a composite material. The composite is fabricated using a 2-Stage stir casting process. The machinability characteristic of the fabricated composite is measured using abrasive water jet machine at varied machining conditions. Water pressure, Stand-off distance and cutting speed are taken as dependent response to measure the kerf angle and surface finish. Water pressure and the cutting speed show a significant impact on kerf taper angle and surface profile roughness with a contribution of 40%. The effect of soft ceramic, LaPO4 in the matrix has low significance as it is easily removed with the cutting conditions and the influence caused by LaPO4 on kerf angle and surface finish is considerably low compared to other hard ceramic reinforcements.