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Key Mechanistic Features of Swelling and Blistering of Helium-Ion-Irradiated Tungsten

10 Pages Posted: 10 Sep 2019 First Look: Accepted

See all articles by Frances I. Allen

Frances I. Allen

University of California, Berkeley - Department of Materials Science and Engineering; University of California, Berkeley - National Center for Electron Microscopy

Peter Hosemann

University of California, Berkeley - Department of Nuclear Engineering; University of California, Berkeley - Materials Sciences Division

Mehdi Balooch

University of California, Berkeley - Department of Nuclear Engineering

Abstract

Helium-ion-induced swelling and blistering of single-crystal tungsten is investigated using a Helium Ion Microscope for site-specific dose-controlled irradiation (at 25keV) with analysis by Helium Ion Microscopy, Atomic Force Microscopy and Transmission Electron Microscopy (cross-sectioning by Focused Ion Beam milling). Our measurements show that the blister cavity forms at the depth of the helium peak and that nanobubbles coalesce to form nanocracks within the envelope of the ion stopping range, causing swelling of the blister shell. These results provide the first direct experimental evidence for the interbubble fracture mechanism proposed in the framework of the gas pressure model for blister formation.

Keywords: Tungsten, helium ion irradiation, surface blistering, inert gas nanobubbles, Helium Ion Microscopy

Suggested Citation

Allen, Frances I. and Hosemann, Peter and Balooch, Mehdi, Key Mechanistic Features of Swelling and Blistering of Helium-Ion-Irradiated Tungsten. Available at SSRN: https://ssrn.com/abstract=3447509

Frances I. Allen (Contact Author)

University of California, Berkeley - Department of Materials Science and Engineering ( email )

Berkeley, CA
United States

University of California, Berkeley - National Center for Electron Microscopy ( email )

United States

Peter Hosemann

University of California, Berkeley - Department of Nuclear Engineering

310 Barrows Hall
Berkeley, CA 94720
United States

University of California, Berkeley - Materials Sciences Division

United States

Mehdi Balooch

University of California, Berkeley - Department of Nuclear Engineering

310 Barrows Hall
Berkeley, CA 94720
United States

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