Evolution of irradiation defects in Ti₂AlC ceramics during heavy ion irradiation

Journal Article · 19 May 2018 · Ceramics International

DOI: https://doi.org/10.1016/j.ceramint.2018.05.095 · OSTI ID:1482551

Wang, Fei ^[1]; Su, Qing ^[1]; Nastasi, Michael ^[1]; Kirk, Marquis A. ^[2]; Li, Meimei ^[2]; Cui, Bai ^[1]

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1. Univ. of Nebraska-Lincoln, Lincoln, NE (United States)
2. Argonne National Lab. (ANL), Argonne, IL (United States)

Here, the evolution of irradiation defects in Ti₂AlC under Kr ion irradiation at room and elevated temperatures has been investigated. The dependence of defect size and density on the irradiation dose and temperature was characterized by in-situ transmission electron microscopy (TEM) irradiation experiments. At 25-800 °C, interstitial-type dislocation loops with several nanometers in diameter form on the basal plane of Ti₂AlC mostly with a Burgers vector of 1/2[0 0 0 1], and no voids have been observed. The number density of dislocation loops approaches saturation at a level of about 2 dpa at 800 °C. Ti₂AlC samples remain crystalline in structure without amorphization or phase transformation. However, the localized disorder of atomic positions on the basal plane of the irradiated Ti₂AlC was revealed by high-resolution transmission electron microscopy (HRTEM) studies, which increases with irradiation dose while decreases with elevated temperatures.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE Office of Nuclear Energy (NE)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1482551
• Journal Information: Ceramics International, Journal Name: Ceramics International Journal Issue: 12 Vol. 44; ISSN 0272-8842
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English