Microstructural and macroscopic aspects of the plasticity of complex metallic alloys

Complex metallic alloys (CMAs) represent a class of materials which are based on crystal structures with exceptionally large unit cells comprising up to more than a thousand atoms. As a result of the structural attributes of these phases, their plastic deformation behaviour features significant differences to conventional mechanisms known from structurally simple materials. In the present work, the plasticity of the three CMA phases, hexagonal µ-Al-Mn, body-centred cubic Mg32(Al,Zn)49, and face-centred cubic ß-Al-Mg was investigated. Uniaxial deformation experiments on single crystalline samples of these alloys were carried out and thermodynamic activation parameters of the deformation processes were determined. Microstructural investigations by means of transmission electron microscopy (TEM) were carried out on µ-Al-Mn and Mg32(Al,Zn)49. The underlying deformation mechanisms of these phases were completely determined. Dislocation climb and associated diffusion of vacancies was found to play an essential role in the deformation processes of both materials.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2008

Author dc:creator

• Roitsch, Stefan

Contributors dc:contributor

• Urban, Knut

• info:eu-repo/classification/ddc/530
• Plastizität
• Versetzungsbewegung
• Durchstrahlungselektronenmikroskopie
• Intermetallische Verbindungen
• Atomcluster
• Aktivierungsvolumen
• Physik
• Complex metallic alloys

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

eng

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-112834%22

OAI record oai:identifier

https://publications.rwth-aachen.de/oai2d?verb=GetRecord&metadataPrefix=oai_dc&identifier=oai%3Apublications.rwth-aachen.de%3A50283