SYMPOSIA PAPER Published: 01 January 1992

Effects of Internal Hydrogen on the Vacancy Loop Formation Probability in Aluminum


The effect of internal hydrogen on the formation of vacancy dislocation loops from heavy-ion generated displacement cascades in aluminum has been investigated by using transmission electron microscopy. Samples of high-punty aluminum and aluminum containing 900 and 1300 appm (atomic parts per million) of hydrogen were irradiated at room temperature with 50-keV Kr+ ions. Under these irradiation conditions, dislocation loops were observed in all compositions, although the formation probability was relatively low (less than 10% of the displacement cascades created a vacancy loop). The loop formation probability was further reduced by the presence of hydrogen. No difference in the geometry or the size of the loops created in the hydrogen-free and hydrogen-charged samples was found.

Author Information

Bui, TX
University of Illinois, Urbana, IL
Sirois, E
University of Illinois, Urbana, IL
Robertson, IM
University of Illinois, Urbana, IL
Kirk, MA
Argonne National Laboratory, Argonne, IL
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Developed by Committee: E10
Pages: 463–471
DOI: 10.1520/STP17886S
ISBN-EB: 978-0-8031-5187-1
ISBN-13: 978-0-8031-1477-7