Modellierung der Verfestigung technischer Aluminiumlegierungen

The large strain work hardening behaviour of technical aluminium alloys as function of the deformation temperature and strain rate is described in two ways. First a phenomenological description is made using well known models from literature. For some specific cases the models are expanded. Furthermore a new model is developed which is based on a cellular dislocation structure, taking into account four internal structure variables, namely: the mobile edge dislocation density, the mobile screw dislocation density and the sessile dislocation densities in cell interior and in cell walls. For each of these structural variables a rate equation is developed which considers detailed dislocation reactions. Therefore a significant number of physical parameters are included, that are not all familiar for the commercial Al-alloy. To facilitate the determination of these physical quantities within reasonable physical limits, an optimisation algorithm is incorporated in the model, enabling the description of macroscopic stress-strain-curves within acceptable margin of error. It is then possible with the model, to describe experimental stress-strain-curves of commercial alloys with only two physical quantities for a wide range of deformation conditions. Modelling the experimental stress-strain-curves for different deformation conditions with this new model reveals that the number of deformation-induced vacancies play an important role in describing the stress-strain-behaviour. It could be shown that the number of these deformation-induced vacancies depend on strain rate and deformation temperature.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2001

Author dc:creator

• Mülders, Barbara

Contributors dc:contributor

• Gottstein, Günter

• info:eu-repo/classification/ddc/660
• Technische Chemie
• Aluminiumlegierung
• Magnesiumlegierung
• Manganlegierung
• Verfestigung
• Fließkurve

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-118947%22

OAI record oai:identifier

https://publications.rwth-aachen.de/oai2d?verb=GetRecord&metadataPrefix=oai_dc&identifier=oai%3Apublications.rwth-aachen.de%3A56868