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First Attempt to Develop A Material Model Describing Single Crystal Creep Behavior

Published online by Cambridge University Press:  10 February 2011

Holger Brehmn  and
Uwe Glatzel
Holger Brehmn
Affiliation:
Technisches Institut, Metallische Werkstoffe, Friedrich- Schiller-Universität Jena, Löbdergraben 32, D-07743 Jena, Germany
Uwe Glatzel
Affiliation:
Technisches Institut, Metallische Werkstoffe, Friedrich- Schiller-Universität Jena, Löbdergraben 32, D-07743 Jena, Germany
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Abstract

A material model is proposed which describes single crystal creep behavior by evolution equations for dislocation densities on individual slip systems. An interaction matrix determines the influence from one glide system to the other. Assuming a face centered cubic crystal, allowing deformation on octahedral glide planes and cube glide planes with a Burgers vector of the type a/2 <110>, nine independent parameters of the interaction matrix can be distinguished. A parameter check of the nine independent parameters has been carried out, showing the influence of parameters on specific orientations of the load axis. If one assumes dislocation interaction of a glide system only with itself a smooth behavior is predicted with a maximum creep rate for [001] orientation, followed by [011] and [111]. If a strong interaction is assumed, the orientation dependent creep behavior is not at all smooth, instead it shows a sharp drop in creep rates mainly in symmetric positions of the standard orientation triangle. The orientations with highest creep rates are in this case those which favor single glide. Highly symmetric orientations, such as [001], [011] and [111] have strongly decreased stationary creep rates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 538: Symposium J – Multiscale Modelling of Materials , 1998 , 547
Copyright
Copyright © Materials Research Society 1999

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