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Hydrogen effects on the character of dislocations in high-purity aluminum

✍ Scribed by P.J. Ferreira; I.M. Robertson; H.K. Birnbaum

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
299 KB
Volume
47
Category
Article
ISSN
1359-6454

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✦ Synopsis

AbstractÐThe eect of hydrogen in solid solution on the edge/screw character of dislocations has been investigated by deforming samples of high-purity aluminum in a gaseous hydrogen environment in situ in a controlled environment transmission electron microscope. Solute hydrogen was found to stabilize edge segments of dislocations, which inhibited, and in some cases stopped dislocations from cross-slipping. Removal of hydrogen from the sample allowed the cross-slip process to continue. These observations provide an explanation for the macroscopic observation that hydrogen in solid solution can promote slip planarity.

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✍ Ruizhi Wu; ZhiKun Qu; Baode Sun; Da Shu πŸ“‚ Article πŸ“… 2007 πŸ› Elsevier Science 🌐 English βš– 980 KB

A continuous hydrogen-removal method for aluminum melt, spray degassing, is used to degass aluminum melt. The effects of various spray degassing parameters on hydrogen content and properties of aluminum are studied. The results show that, too high or too low melt temperature is unfavorable for hydro