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.


Materials Science and Engineering

Research Center/Lab(s)

Intelligent Systems Center


The work was also supported by the National Natural Science Foundation of China under grant numbers 11375046 and U163010.

Keywords and Phrases

He bubbles; He irradiation; Irradiation resistance; Nanograins; Ti2AlC

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Document Type

Article - Journal

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© 2019 Elsevier Ltd, All rights reserved.

Publication Date

01 Jun 2019