Özet:

Titanium and titanium alloys have attracted interest because they offer high specific strengths and are widely used across various industrial applications..Titanium metal matrix composites (TMMCs) reinforced with ceramic particles have considerable potential for structural applications in the aerospace, transportation and industrial sectors primarily because of their high specifi modulus, toughness, elevated temperature, high specific strength, good corrosion resistance and good wear resistance. In this work, hexagonal boron nitride (h-BN)-embedded TMMCs (Ti6Al4V/h-BN) composites were prepared using a conventional powder metallurgy process and their densities and mechanical properties under dynamic loadings were investigated. In manufactured composites proportions of reinforced BN were chosen for first experiment to be 10%, 15%, and 20% by volume.After mixing an planetary ball mill for four hours, the powders were pressed by uniaxial, then they were sintered at temperatures of 1300 oC under the high purity argon atmosphere for an hour.Before the sintering process, binder was removed at 600°C under the high purity argon atmosphere. Effects of h-BN content and sintering temperature on the mechanical properties and densities were primary interest. The results suggested that an increase in h-BN content reduced the hardness of the composites, but that the hardness could be improved by increasing the sintering temperature.

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