Tensile specimens of pure copper were neutron irradiated at similar to323 K to a displacement dose of 0.3 dpa (displacement per atom). Five irradiated specimens were tensile tested at 300 K, but four of the specimens were stopped at specific strains -just before the yield point at similar to90% of the macroscopic yield, at 1.5% and 5% elongation, and near the ultimate tensile strength at 14.5% elongation, with the 5th specimen tested to failure (e(T) = 22%). SEM and TEM characterization of the deformed specimens revealed that the plastic strain was confined primarily to the 'cleared' channels only, and that channels were present in a low number even before the macroscopic yield. New primary channels and secondary channels continued to form with increasing strain, suggesting the increase in stress was related directly to the initiation of new channels as earlier sources were exhausted. (C) 2004 Elsevier B.V. All rights reserved.
Journal of Nuclear Materials, 2004, Vol 329-333, Issue part b, p. 1072-1077
11th International conference on fusion reactor materials, 2004