Defect evolution in Ni and solid-solution alloys of NiFe and NiFeCoCr under ion irradiation at 16 and 300 K

JOURNAL OF NUCLEAR MATERIALS

卷:534

Article

Mieszczynski, C.¹  Ratajczak, R.¹  Jagielski, J.^1,2  Velisa, G.^3,6  Bei, H.⁴  Sales, B. C.³  Wendler, E.⁵  Weber, W. J.^3,4  Zhang, Y.^3,4 

[1] Natl Ctr Nucl Res, NOMATEN MAB Grp, A Soltana 7, PL-05400 Otwock, Poland

[2] Inst Elect Mat Technol, Lukasiewicz Res Network, Wolczynska 133, PL-01919 Warsaw, Poland

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

[4] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[5] Friedrich Schiller Univ Jena, Inst Festkorperphys, Jena, Germany

[6] Horia Hulubei Natl Inst Phys & Nucl Engn, POB MG-6, Magurele 077125, Romania

关键词: Single-phase concentrated solid-solution alloys;    RBS/C;    MC simulations;    Ion-solid interactions;    Damage distribution;   

DOI  :  10.1016/j.jnucmat.2020.152138

来源: Elsevier

【 摘 要 】

Single-phase concentrated solid-solution alloys (SP-CSAs) have shown unique chemical complexity at the levels of electrons and atoms, and their defect evolution is expected to be different from conventional dilute alloys. Single crystals of Ni, NiFe and NiFeCoCr are chosen as model systems to understand the chemical complexity on defect formation and damage accumulation in SP-CSAs under ion irradiation. The high-quality crystals were irradiated at 16 and 300 K to different ion fluences, to form irradiated region with little to heavy damages. The ion-induced damage was determined using Rutherford backscattering spectrometry technique along a channeling direction (RBS/C) and the level of lattice damage in irradiated Ni and SP-CSAs was quantified from Monte Carlo (MC) simulations. The results are interpreted using the Multi Step Damage Accumulation model to reveal material damage accumulation kinetics. Key findings of the study are that in case of room temperature irradiations the damage level measured for complex alloys at the highest irradiation fluence of 2 x 10(15) cm(-2) (similar to 3 dpa) is significantly higher than that obtained for pure nickel samples and suggest two-step damage accumulation process with a defect transformation taking place at a fluence of about 1.5 x 10(15) cm(-2). Moreover, structural and damage kinetic differences clearly imply that, with increasing degree of chemical complexity and high solidsolution strengthening effects from Ni to NiFe and to NiFeCoCr, the enhanced lattice stiffness resists to randomization of atomic configurations and inhibits the growth of extended defects. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

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