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

被引：46
作者：
Swenson, M. J. [1 ]
Wharry, J. P. [2 ]
机构：
[1] Boise State Univ, 1910 Univ Dr, Boise, ID 83725 USA
[2] Purdue Univ, 400 Cent Dr, W Lafayette, IN 47907 USA
来源：
JOURNAL OF NUCLEAR MATERIALS | 2017年 / 496卷
关键词：
Nanoclusters; Ion irradiation; Neutron irradiation; Oxide dispersion strengthened; Ferritic/martensitic; HT9; HCM12A; G-phase; Phase separation; MOLECULAR-DYNAMICS SIMULATION; DISPERSION-STRENGTHENED STEEL; ION-IRRADIATION; PHASE-STABILITY; DISPLACEMENT CASCADES; MECHANICAL-PROPERTIES; STRUCTURAL-MATERIALS; MATERIALS CHALLENGES; NEUTRON-IRRADIATION; RADIATION RESPONSE;
D O I：
10.1016/j.jnucmat.2017.08.045
中图分类号：
T [工业技术];
学科分类号：
08 ;
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.
引用
收藏
页码：24 / 40
页数：17
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