Mechanisms of serrated flow in aluminium alloys with precipitates investigated by acoustic emission

By measuring the acoustic emission, it is possible to distinguish between deformation which is controlled by normal dislocation motion through a crystal lattice, and deformation controlled by the shearing of coherent particles. These results from alloys with different precipitate structures can be c...

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Bibliographic Details
Published in:Acta materialia 1998-07, Vol.46 (12), p.4435-4442
Main Authors: Chmelı́k, F., Pink, E., Król, J., Balı́k, J., Pešička, J., Lukáč, P.
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Deformation, plasticity, and creep
Exact sciences and technology
Materials science
Metals. Metallurgy
Physics
Treatment of materials and its effects on microstructure and properties
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Summary:By measuring the acoustic emission, it is possible to distinguish between deformation which is controlled by normal dislocation motion through a crystal lattice, and deformation controlled by the shearing of coherent particles. These results from alloys with different precipitate structures can be correlated with the appearance of serrated flow: when shearing is pronounced, serrated flow is minute. The claim that shearing is directly responsible for serrated flow is not supported by these findings.
ISSN:1359-6454
1873-2453
DOI:10.1016/S1359-6454(98)00070-6