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Study of mechanical and machining behavior of AA 7075-3%TiB2 in-situ composite

S.Sasikumar, K.R.Ramkumar, S.Iniyan, M.Gowthaman, Dr.S.Sivasankaran

This paper investigates the study of mechanical and machining behavior of AA 7075- 3%TiB2 in-situ composite prepared by liquid metallurgy route. This in-situ method involves formation of reinforcements within the matrix by the chemical reaction of two or more compounds which also produces some changes in the matrix material within the vicinity. Titanium Boride (TiB2) was the reinforcements in the matrix of AA 7075 alloy which can be suitable for space, aircraft and automotive components at elevated temperatures. The composite was prepared with the formation of the reinforcement inside the molten matrix by adding salts of Potassium Tetrafluoroborate (KBF4) and Potassium Hexafluorotitanate (K2TiF6). The mechanical properties in terms of hardness and impact test were carried out. The sample of AA 7075 alloy was also casted and tested for comparison. It was observed that the hardness and impact strength of AA 7075-3% TiB2 in-situ composite was improved by 25% and 10% than AA 7075 alloy respectively. The casted samples were subjected to turning using CNC turning machine. The chip morphology and the surface roughness were measured and reported.