MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Diffusion of Carbon in Niobium and Molybdenum
Jun-ichi ImaiOsamu TaguchiGyanendra Prasad TiwariYoshiaki Iijima
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2014 Volume 55 Issue 12 Pages 1786-1791

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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 1567 K for niobium and between 1271 and 1669 K for molybdenum. The temperature dependences of the diffusion coefficient of carbon in niobium and molybdenum are expressed by D/m2 s−1 = 2.2 × 10−6 exp(−152 kJ mol−1/RT) and D/m2 s−1 = 5.2 × 10−6 exp(−163 kJ mol−1/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.

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© 2014 The Japan Institute of Metals and Materials
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