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From the Electronic Structure to the Macroscopic Behavior: A Multi-scale Analysis of Plasticity in Intermetallic Compounds

Published online by Cambridge University Press:  21 March 2011

Manfred Fähnle ,
Susanne Kohlhammer  and
Gabriel Bester
Manfred Fähnle
Affiliation:
Max-Planck-Institut für Metallforschung Heisenbergstr. 1 D-70569 Stuttgart, Germany
Susanne Kohlhammer
Affiliation:
Max-Planck-Institut für Metallforschung Heisenbergstr. 1 D-70569 Stuttgart, Germany
Gabriel Bester
Affiliation:
Max-Planck-Institut für Metallforschung Heisenbergstr. 1 D-70569 Stuttgart, Germany
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Abstract

The influence of crystal interfaces related to stacking faults on the properties of >110< superdislocations and hence on the temperature dependences of the yield stress in intermetallic compounds is investigated. This is achieved by a combination of the ab-initio density functional electron theory (which describes the electronic scale) with the generalized Peierls-Nabarro model (which describes the atomistic scale). For Pt3Al and doped Al3Ti our data do not support the hypothesis that the strong increase of the yield stress with decreasing T at low T results from sessile SISF-bound dislocation dissociations. Alternative explanations are suggested. For Ni3Al our results do not rule out the idea that Kear-Wilsdorf locks are responsible for the experimentally observed anomalous temperature dependence of the yield stress.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 652: Symposium Y – Influences of Interface & Dislocation Behavior on Microstructure Evolution , 2000 , Y4.5
Copyright
Copyright © Materials Research Society 2001

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References

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