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Observation of Dislocation Cutting Ω Phase and its Strengthening Mechanism in an Al-Cu-Mg-Ag Alloy

Published online by Cambridge University Press:  31 January 2003

Bernard Q. Li  and
Franklin E. Wawner
Bernard Q. Li
Affiliation:
Reynolds Metals Company, P.O. Box 27003, Richmond, VA 23261
Franklin E. Wawner
Affiliation:
Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA 22903
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Abstract

Abstract: This investigation presents the interaction of dislocations and semicoherent precipitates (Ω phase) in an Al-Cu-Mg-Ag alloy. The study shows that the semicoherent precipitate is cut by dislocations during deformation. Conventional transmission electron microscopy (TEM) and high resolution TEM (HRTEM) observations demonstrate that shearing of precipitates by dislocations occurs by multiple cutting in the precipitate. The step height caused by cutting on the Ω precipitate is only several atomic layers of the Ω phase. The Ω phase is strengthened after shearing by dislocations. A strengthening mechanism is proposed on the basis of this observation. The strengthening mechanism is not only applicable to the Ω precipitate in Al-Cu-Mg-Ag alloys but also to the other semicoherent precipitates in other alloys.

Type
Research Article
Information
Microscopy and Microanalysis , Volume 3 , Issue 2 , March 1997 , pp. 139 - 145
Copyright
2001 Cambridge University Press

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