Surface patterns formation by ion irradiation of PAN based сarbon fibers

Surface patterns on PAN based сarbon fibers under 3 and 30 keV He+ and 30 keV Ar+ ions irradiation were experimentally studied. It has been found that the depth distributions ν(х) of the number of displacements per atom (dpa) have a strong effect on the surface patterns on PAN-based carbon fibers. F...

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Bibliographic Details
Published in:	Vacuum Vol. 188; p. 110177
Main Authors:	Andrianova, N.N., Borisov, A.M., Mashkova, E.S., Ovchinnikov, M.A., Timofyev, M.A., Vysotina, E.A.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-06-2021
Subjects:	High-fluence He+ and Ar+ irradiation Ion-induced surface patterns PAN based Carbon fibers Raman spectra Scanning electron microscopy Twinning High-fluence He+ and Ar+ irradiation Raman spectra Scanning electron microscopy Twinning Ion-induced surface patterns PAN based Carbon fibers
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Summary:	Surface patterns on PAN based сarbon fibers under 3 and 30 keV He+ and 30 keV Ar+ ions irradiation were experimentally studied. It has been found that the depth distributions ν(х) of the number of displacements per atom (dpa) have a strong effect on the surface patterns on PAN-based carbon fibers. For not steady state profiles ν(х), a ridge-like structure oriented along the fibers is formed on the surface. At sufficiently high irradiation fluences with a steady-state profile ν(х), a corrugated structure is formed with corrugations transverse to the fiber axis. The corrugation effect is explained by twinning during plastic deformation of fiber shell crystallites caused by radiation-induced dimensional changes and mechanical stresses. •Irradiation with 30 keV Ar+ leds to the formation of corrugations on the carbon fiber.•Irradiation with 30 keV He+ leds to the formation of ridges along the carbon fiber.•Depth profiles of dpa have a strong effect on the surface patterns on carbon fibers.•Twinning is an important factor in the relaxation of ion-induced stresses in fiber shell.
ISSN:	0042-207X 1879-2715
DOI:	10.1016/j.vacuum.2021.110177