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Assessing the Neutron-Irradiation Resistance of Ti-Based MAX Phases at High Temperatures

23 Pages Posted: 9 Jan 2019 First Look: Under Review

See all articles by Matheus A. Tunes

Matheus A. Tunes

University of Huddersfield - School of Computing and Engineering

Robert W. Harrison

University of Manchester - School of Mechanical, Aerospace and Civil Engineering

Stephen E. Donnelly

University of Huddersfield - School of Computing and Engineering

Philip D. Edmondson

Government of the United States of America - Materials Science and Technology Division

Abstract

Mn+1AXn phases, or simply MAX phases, are unique nanolayered materials that have been attracting the attention of the nuclear materials community worldwide due to the recent reports of superior radiation resistance compared to conventional ceramics. However, the knowledge and understanding of their response to neutron irradiation is fairly limited, in particular at high temperatures where MAX phases are expected to have high thermodynamic phase stability. In this paper, a complete and extensive study of neutron-irradiation effects at high temperatures on Ti-based MAX phases is presented. The MAX phases Ti3SiC2 and Ti2AlC were irradiated at 1273 K in the High-Flux Isotope Reactor located at the Oak Ridge National Laboratory up to 10 displacement per atom (dpa). Post-irradiation characterisation was performed within a Transmission Electron Microscope on both irradiated and pristine samples. Upon increasing the dose from 2 to 10 dpa, the areal density of black-spots in the Ti2AlC was observed to significantly increase while in the Ti3SiC2, disordered dislocation networks were observed. Regarding the Ti3SiC2, black-spot damage was observed to be concentrated within secondary phases, but absent in the matrix. Dislocation lines and loops were observed at both 2 and 10 dpa. The dislocation loops were identified to be of <a> type. At 2 dpa, stacking faults were observed in both materials, but were absent at 10 dpa. Cavities have also been observed, although no relationship with between size and dose was obtained. Finally, at 10 dpa, both MAX phases exhibited evidences of phase decomposition and irradiation-induced segregation. The presented results shed light on a very complex chain of radiation-induced defects in neutron-induced microstructures in both materials at high temperatures, and provide information that will enable better design of more radiation tolerant materials in the future.

Keywords: MAX phases, Neutron Irradiation, Ti3SiC2, Ti2AlC, Transmission Electron Microscopy

Suggested Citation

Tunes, Matheus A. and Harrison, Robert W. and Donnelly, Stephen E. and Edmondson, Philip D., Assessing the Neutron-Irradiation Resistance of Ti-Based MAX Phases at High Temperatures (January 7, 2019). Available at SSRN: https://ssrn.com/abstract=3311683

Matheus A. Tunes (Contact Author)

University of Huddersfield - School of Computing and Engineering ( email )

Queensgate
Huddersfield, HD1 3DH
United Kingdom

Robert W. Harrison

University of Manchester - School of Mechanical, Aerospace and Civil Engineering

United Kingdom

Stephen E. Donnelly

University of Huddersfield - School of Computing and Engineering

Queensgate
Huddersfield, HD1 3DH
United Kingdom

Philip D. Edmondson

Government of the United States of America - Materials Science and Technology Division

Oak Ridge, TN
United States

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