Fracture toughness and bond trapping of grain boundary cracks

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Möller J, Bitzek E
Zeitschrift: Acta Materialia
Verlag: Elsevier
Jahr der Veröffentlichung: 2014
Band: 73
Seitenbereich: 1-11
ISSN: 1359-6454


Abstract


The fracture toughness of materials in which brittle cracks initiate and propagate along grain boundaries (GBs) depends not only on the energy of the GB, but also on its microscopic structure. Exactly how and to what degree brittle GB fracture is affected by the local atomic structure at the crack tip has not yet been studied in detail. Here, we use molecular static simulations to study the atomic-scale fracture behavior of six large-angle tilt GBs in tungsten bicrystals. The fracture toughness depends critically on the propagation direction and on the position of the crack tip within the structural units of the GB. Furthermore, the GB fracture toughness can be significantly larger than for single crystals in the same orientation. These results cannot be explained by the usual thermodynamic approach in continuum-scale fracture mechanics but can be understood by considering the effect of bond trapping of GB cracks. © 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Bitzek, Erik Prof. Dr.-Ing.
Professur für Werkstoffwissenschaften (Simulation und Werkstoffeigenschaften)
Möller, Johannes
Professur für Werkstoffwissenschaften (Simulation und Werkstoffeigenschaften)


Zusätzliche Organisationseinheit(en)
Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden
Exzellenz-Cluster Engineering of Advanced Materials
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)


Forschungsbereiche

A3 Multiscale Modeling and Simulation
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

APA:
Möller, J., & Bitzek, E. (2014). Fracture toughness and bond trapping of grain boundary cracks. Acta Materialia, 73, 1-11. https://dx.doi.org/10.1016/j.actamat.2014.03.035

MLA:
Möller, Johannes, and Erik Bitzek. "Fracture toughness and bond trapping of grain boundary cracks." Acta Materialia 73 (2014): 1-11.

BibTeX: 

Zuletzt aktualisiert 2019-03-06 um 17:11