Formation of Nanostructures in Ti₂AlC Induced by High-Temperature Helium Irradiation
The effects of helium (He) irradiation on Ti2AlC at different temperatures were studied in this work. He irradiation at room temperature (RT) induced severe lattice distortion and caused serious cracks in the samples. During He irradiation, Ti-Al bonds were easily broken and He atoms tended to accumulate at basal planes forming microcracks after irradiations at RT and 430 °C. Stacking faults and nanotwins were formed after He irradiation at all temperatures. Three kinds of nanostructures were formed after He irradiation: 1) face-centered cubic (fcc) nanotwins generated by outward diffusion of Al, accumulation of C interstitials and detwinning of Ti2C slabs; 2) fcc nanograins induced by the formation of fcc structure and its subsequent amorphization by irradiation; 3) Ti2AlC nanotwins induced by recrystallization from fcc nanotwins at 750 °C. All the results indicate that Ti2AlC is highly resistant to He radiation and has excellent damage recovery at high temperatures.
R. Su et al., "Formation of Nanostructures in Ti₂AlC Induced by High-Temperature Helium Irradiation," Journal of the European Ceramic Society, vol. 39, no. 6, pp. 1993-2002, Elsevier Ltd, Jun 2019.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2019.01.056
Materials Science and Engineering
Intelligent Systems Center
Keywords and Phrases
He bubbles; He irradiation; Irradiation resistance; Nanograins; Ti2AlC
International Standard Serial Number (ISSN)
Article - Journal
© 2019 Elsevier Ltd, All rights reserved.
01 Jun 2019