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题名: Tensile properties and microstructure of Zr-1.8Nb alloy subjected to 140-MeV C4+ ion irradiation
作者: Yang, H. L.;  Kano, S.;  Matsukawa, Y.;  Shen, J. J.;  Zhao, Z. S.;  Duan, Z. G.;  Chen, D. Y.;  Murakami, K.;  Li, Y. F.;  Satoh, Y.;  Abe, H.
发表日期: 2017-11-1
摘要: Tensile properties and microstructure of a Zr-1.8Nb alloy subjected to 140-MeV C4+ ion irradiation at 573 K up to 5.3 dpa have been investigated by using 0.18 mm-thick tensile specimens. Irradiation damage was introduced into the tensile specimens homogeneously over entire thickness using a variable energy degrader. Irradiation-induced strengthening and embrittlement ( loss of ductility) were successfully evaluated. The yield strength of irradiated specimens (3.1-and 5.3-dpa) was 137% and 145% of unirradiated specimen, whereas the total elongation of those irradiated specimens was less than a half of unirradiated specimen. It appears that the rate of embrittlement is fairly faster than the rate of strengthening. Transmission electron microscopy (TEM) observation on the 3.1-dpa specimen revealed that the bcc-Nb/Zr precipitates originally contained in the alloy were stable in terms of crystal structure and size. The size and number density of dislocation loops were 7.2 nm and 1.2 x 10(21)/m(3) for the loops, 15.4 nm and 6.5 x 10(20)/m(3) for the -type loops, respectively. The increase of yield strength expected from these dislocation loops was similar to 64% of the actual irradiation-induced strengthening, indicating that the dislocation loops are the main contributors for the irradiation-induced strengthening. (C) 2017 Elsevier B.V. All rights reserved.
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Recommended Citation:
Yang, H. L.,Kano, S.,Matsukawa, Y.,et al. Tensile Properties And Microstructure Of Zr-1.8nb Alloy Subjected To 140-mev C4+ Ion Irradiation[J]. Elsevier Science Bv,2017,495:138-145.

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