Nanocluster irradiation evolution in Fe-9%Cr ODS and ferritic-martensitic alloys

JOURNAL OF NUCLEAR MATERIALS

卷:496

Article

Swenson, M. J.¹  Wharry, J. P.² 

[1] Boise State Univ, 1910 Univ Dr, Boise, ID 83725 USA

[2] Purdue Univ, 400 Cent Dr, W Lafayette, IN 47907 USA

关键词: Nanoclusters;    Ion irradiation;    Neutron irradiation;    Oxide dispersion strengthened;    Ferritic/martensitic;    HT9;    HCM12A;    G-phase;    Phase separation;   

DOI  :  10.1016/j.jnucmat.2017.08.045

来源: Elsevier

【 摘 要 】

The objective of this study is to evaluate the influence of dose rate and cascade morphology on nanocluster evolution in a model Fe-9%Cr oxide dispersion strengthened steel and the commercial ferritic/ martensitic (F/M) alloys HCM12A and HT9. We present a large, systematic data set spanning the three alloys, three irradiating particle types, four orders of magnitude in dose rate, and doses ranging 1-100 displacements per atom over 400-500 degrees C. Nanoclusters are characterized using atom probe tomography. ODS oxide nanoclusters experience partial dissolution after irradiation due to inverse Ostwald ripening, while F/M nanoclusters undergo Ostwald ripening. Damage cascade morphology is indicative of nanocluster number density evolution. Finally, the effects of dose rate on nanocluster morphology provide evidence for a temperature dilation theory, which purports that a negative temperature shift is necessary for higher dose rate irradiations to emulate nanocluster evolution in lower dose rate irradiations. (C) 2017 Elsevier B. V. All rights reserved.

【 授权许可】

Free