Present work deals with the investigation of the wear behavior of Al 5083 composites synthesized by stir casting technique reinforced with constant weight percentage (5%) of Al 2 O 3 and four different weight percentages of B 4 C (0%, 3%, 5%, and 7%)were taken for investigation. Evaluation of wear properties with the different reinforcement has been obtained. Wear test carried out by the pin-on-disc method under dry conditions with the different load 10, 20N. The worn surface was investigated by the Scanning Electron Microscope (SEM). The investigation reveals that the wear resistance has been improved by increasing weight percentage of B 4 C and Al 2 O 3 , the worn samples show a light adhesive wear traces at the same condition.

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of Orthodo nti cs a nd De ntofa cia l O rtho paed ics J.S.5. Denta l Co ll ege and hosp ital, MYSORE (Ka rn ataka) -570 0 15. Dr. Pa nchali Ba tra, B.D.S. Post Graduate Stud e nt, Dept. o f Orthodon tics a nd De ntofac ia l Orthopaed ics,

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The study on the solidification of aluminium alloys has been reported by the squeeze casting method. In solidification analysis, the formation of casting plays a vital role. To provide quality casting, the preparation of composite is essential. Hence the liquid state processing of the squeeze casting technique is adopted. The application of pressure during the fabrication of composite would change the structure and properties of the developed composite. The squeezing pressure is assigned 30,60,90 and 110MPa, and the melting of the aluminium the selected temperature is 850°C, and the die temperature is 350°C respectively. At 30MPa, the solidification time is recorded at 69 seconds, and the pressure is increased to 110 MPa the solidification is recorded at 33 seconds. The cooling rate is reduced due to increasing squeeze pressure. K type thermocouple has been used to record the temperature values of the aluminium alloy. The theoretical solidification time is calculated, and the results are close to the values which have been taken from the experimental results. Further, the hardness value is identified to measure the grain structure formation in the aluminium alloy, which is correlated with the solidification process.