Abstract
Diffusion coefficients of carbon in niobium and molybdenum have been determined by the residual activity method with radioactive tracer 14C in the temperature ranges between 1168 and 1567K for niobium and between 1271 and 1669K for molybdenum. The temperature dependences of the diffusion coefficient of carbon in niobium and molybdenum are expressed by D/m2 s11 = 2.2 © 1016 exp(1152 kJmol11/ RT) and D/m2 s11 = 5.2 © 1016 exp(1163 kJmol11/RT), respectively. Since the solubility of carbon in molybdenum is very small, the diffusion of carbon in molybdenum is strongly influenced by carbide precipitation at lower temperatures. [doi:10.2320/matertrans.M2014277]
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