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Formation of nanostructures in Ti 2 AlC induced by high-temperature helium irradiation

Journal of the European Ceramic Society, ISSN: 0955-2219, Vol: 39, Issue: 6, Page: 1993-2002
2019
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The effects of helium (He) irradiation on Ti 2 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 Ti 2 C slabs; 2) fcc nanograins induced by the formation of fcc structure and its subsequent amorphization by irradiation; 3) Ti 2 AlC nanotwins induced by recrystallization from fcc nanotwins at 750 °C. All the results indicate that Ti 2 AlC is highly resistant to He radiation and has excellent damage recovery at high temperatures.

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