MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Neutron Irradiation Behavior of Tungsten
Akira HasegawaMakoto FukudaTakashi TannoShuhei Nogami
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2013 Volume 54 Issue 4 Pages 466-471

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Abstract

Tungsten (W) is a candidate for the plasma facing component material of fusion reactors. During fusion reactor operation, not only displacement damage but also transmutation elements such as rhenium (Re) and osmium (Os) are produced in W by neutron irradiation. To understand the irradiation response of W in a fusion reactor, irradiation effects on hardening, microstructure development and electric resistivity of pure W and W–Re–Os alloys are studied using fission reactor irradiation. In the low-dpa region (<0.4 dpa), irradiation hardening was suppressed by Re addition, but significant hardening appeared in W–26Re alloy after high-dpa (>1 dpa) irradiation. The hardening was caused by the irradiation-induced precipitation of WRe (σ–phase) and WRe3 (χ–phase). Os was more effective in the irradiation hardening than Re owing to the similar irradiation-induced precipitate formation even in low-dpa region. On the bases of these results, the alloy design of W for fusion reactor applications is suggested.

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© 2013 The Japan Institute of Metals and Materials
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