Abstract
The effect of ambient temperature on the friction of titanium and titanium alloy TA6V has been studied at high temperature and under vacuum using the ISMCM frictiograph. Curves showing the variation of friction with temperature reveal that under this test condition two phases exist. In the first phase friction is constant, wear is small and surface damage is superficial. The second phase occurs at a critical temperature of about 300°C. It is characterized by high friction and gross surface wear. Above this temperature interfacial bonds are developed which are stronger than the base metal leading to subsurface shear. It is shown that in the temperature range studied the bonds are due to the interpenetration of the materials in contact brought about by the combined action of temperature and stress which simultaneously weaken the subsurface layers and favour adhesion. The occurrence of the critical threshold can be delayed by modifying the metallographic structure of the surface layers of the TA6V alloy by nitriding. The frictional behaviour of the alloys tested can be further improved by choosing as a mating material cobalt based stellite which is more compatible with titanium and which has better high temperature mechanical properties.
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