MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Effect of Rhenium Addition on Tungsten Diffusivity in Iron-Chromium Alloys
Tomonori KuniedaKoji YamashitaYoshinori MurataToshiyuki KoyamaMasahiko Morinaga
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2006 Volume 47 Issue 8 Pages 2106-2108

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Abstract

The Alloying effect of Re on the diffusivity of W in Fe-15 mol%Cr based alloys was investigated experimentally using the Fe-15Cr/Fe-15Cr-5W and Fe-15Cr-1Re/Fe-15Cr-5W diffusion systems. In these systems, a single ferrite phase existed stably at 1473 K, and Fe and W atoms interdiffused at 1473 K without any attendant changes in the Cr concentration of 15 mol% in them. The measured diffusion length of W atoms was shorter in the Re-containing diffusion system than the Re-free one. Following the binary Boltzmann-Matano method, an apparent interdiffusion coefficient at 1473 K was estimated to be 7.1×10−15 m2/s in the Re-free diffusion system and 1.5×10−15 m2/s in the Re-containing diffusion system. Thus, the presence of Re in the alloy worked to suppress the atomic diffusion of W in a ferrite phase.

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© 2006 The Japan Institute of Metals and Materials
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