Irradiation stability and induced ferromagnetism in a nanocrystalline CoCrCuFeNi highly-concentrated alloy

Autor(es)

Tunes, Matheus A. ^[1] ; Greaves, Graeme ^[2] ; Rack, Philip ^{[3, 4]} ; Boldman, Walker ^[4] ; Schon, Claudio ^[5] ; Pogatscher, Stefan ^[6] ; Maloy, Stuart A. ^[1] ; Zhang, Yanwen ^{[7, 4]} ; El-Atwani, Osman ^[1]

Afiliação do(s) autor(es)

^[1] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 - USA

^[2] Univ Huddersfield, Sch Comp & Engn, Huddersfield, W Yorkshire - England

^[3] Oak Ridge Natl Lab, Joint Staff Ctr Nanophase Mat Sci, Oak Ridge, TN - USA

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

^[5] Univ Sao Paulo, Dept Met & Mat Engn, Escola Politecn, Sao Paulo - Brazil

^[6] Univ Leoben, Chair Nonferrous Met, Leoben - Austria

^[7] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN - USA

• Tipo de documento: Artigo Científico
• Fonte: NANOSCALE; v. 13, n. 48 DEC 2021.
• Citações Web of Science: 0

Resumo

In the field of radiation damage of crystalline solids, new highly-concentrated alloys (HCAs) are now considered to be suitable candidate materials for next generation fission/fusion reactors due to recently recorded outstanding radiation tolerance. Despite the preliminarily reported extraordinary properties, the mechanisms of degradation, phase instabilities and decomposition of HCAs are still largely unexplored fields of research. Herein, we investigate the response of a nanocrystalline CoCrCuFeNi HCA to thermal annealing and heavy ion irradiation in the temperature range from 293 to 773 K with the objective to analyze the stability of the nanocrystalline HCA in extreme conditions. The results led to the identification of two regimes of response to irradiation: (i) in which the alloy was observed to be tolerant under extreme irradiation conditions and (ii) in which the alloy is subject to matrix phase instabilities. The formation of FeCo monodomain nanoparticles under these conditions is also reported and a differential phase contrast study in the analytical electron-microscope is carried out to qualitatively probe its magnetic properties. (AU)

• Processo FAPESP: 16/25248-3 - Resolvendo a questão da escala de temperaturas em cálculos de diagramas de fases por primeiros princípios
• Beneficiário: Claudio Geraldo Schon
• Modalidade de apoio: Bolsas no Exterior - Pesquisa