SYMPOSIA PAPER Published: 01 January 1982
STP34349S

The Effect of Preimplanted Helium on the Microstructure of Neutron Irradiated Nb, Nb-1%Zr and Nb-1%Zr-0.4%Mo

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The effect of preimplanted helium on the microstructure of neutron irradiated pure niobium and two dilute niobium alloys, Nb-1%Zr and Nb-1%Zr-0.4%Mo, was investigated by electron microscopy. Helium was implanted in the materials by means of a cyclotron with α-particles of 35 MeV at specimen temperatures of 420 K. The helium content ranges from 10–1000 at. ppm. Helium-containing and helium-free specimens were irradiated with neutrons at 940 K to 1.4 × 1025 and 4.8 × 1025n.m−2 (E > 0.1 MeV). Preimplantation with helium had essentially no effect on cavity size, concentration and volume fraction in Nb. The volume fraction of cavities in the alloys, however, is larger with helium. The increase is due to a larger cavity concentration in Nb-Zr. In the Nb-Zr-Mo alloy cavities formed in the helium-containing specimens only.

Author Information

van Witzenburg, W
Netherlands Energy Research Foundation, ECN, Petten, The Netherlands
van Tilborg, PJ
Netherlands Energy Research Foundation, ECN, Petten, The Netherlands
Mastenbroek, A
Netherlands Energy Research Foundation, ECN, Petten, The Netherlands
Elen, JD
Netherlands Energy Research Foundation, ECN, Petten, The Netherlands
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Developed by Committee: E10
Pages: 251–259
DOI: 10.1520/STP34349S
ISBN-EB: 978-0-8031-4846-8
ISBN-13: 978-0-8031-0753-3