SINGLE-PHASE INTERDIFFUSION IN TIAL

Interdiffusion coefficients in gamma-TiAl have been measured in the te mperature range from 1116 to 1583 K. No significant concentration depe ndence of the interdiffusivities was observed in Ti50Al50/Ti46Al54 sin gle-phase interdiffusion couples. The temperature dependence of the in terdiffusivities obeys the Arrhenius law with a pre-exponential factor of D-0 = 2.8 . 10(-4) m(2) s(-1) and an activation enthalpy of Q = (2 95 +/- 10) kJ mol(-1) within experimental error. The present result is discussed together with the data of Ti-44 tracer diffusion in TiAl.