Title

Formation of Nanostructures in Ti₂ AlC Induced by High-Temperature Helium Irradiation

Abstract

The effects of helium (He) irradiation on Ti2 AlC 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 Ti2 C slabs; 2) fcc nanograins induced by the formation of fcc structure and its subsequent amorphization by irradiation; 3) Ti2 AlC nanotwins induced by recrystallization from fcc nanotwins at 750 °C. All the results indicate that Ti2 AlC is highly resistant to He radiation and has excellent damage recovery at high temperatures.

Department(s)

Materials Science and Engineering

Keywords and Phrases

He bubbles; He irradiation; Irradiation resistance; Nanograins; Ti2 AlC

International Standard Serial Number (ISSN)

0955-2219

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 Elsevier Ltd, All rights reserved.

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