Evolution of ion damage at 773K in Ni- containing concentrated solid-solution alloys

JOURNAL OF NUCLEAR MATERIALS

卷:501

Article

Shi, Shi¹  He, Mo-Rigen¹  Jin, Ke²  Bei, Hongbin²  Robertson, Ian M.^1,3 

[1] Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[3] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA

关键词: Concentrated solid-solution alloys;    In situ ion irradiation;    Defect evolution;    Defect migration;   

DOI  :  10.1016/j.jnucmat.2018.01.015

来源: Elsevier

【 摘 要 】

Quantitative analysis of the impact of the compositional complexity in a series of Ni-containing concentrated solid-solution alloys, Ni, NiCo, NiFe, NiCoCr, NiCoFeCr, NiCoFeCrMn and NiCoFeCrPd, on the evolution of defects produced by 1 MeV Kr ion irradiation at 773 K is reported. The dynamics of the evolution of the damage structure during irradiation to a dose of 2 displacements per atom were observed directly by performing the ion irradiations in electron transparent foils in a transmission electron microscope coupled to an ion accelerator. The defect evolution was assessed through measurement of the defect density, defect size and fraction of perfect and Frank loops. These three parameters were dependent on the alloying element as well as the number of elements. The population of loops was sensitive to the ion dose and alloy composition as faulted Frank loops were observed to unfault to perfect loops with increasing ion dose. These dependences are explained in terms of the influence of each element on the lifetime of the displacement cascade as well as on defect formation and migration energies. (c) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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