Stress evolution and cracking of crystalline diamond thin films on ductile titanium substrate: Analysis by micro-Raman spectroscopy and analytical modelling

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autor(en): Ahmed F, Bayerlein K, Rosiwal S, Göken M, Durst K
Zeitschrift: Acta Materialia
Jahr der Veröffentlichung: 2011
Band: 59
Heftnummer: 14
Seitenbereich: 5422-5433
ISSN: 1359-6454
Sprache: Englisch


Abstract


In this study, the cracking of a brittle diamond coating on a titanium substrate under tensile straining was investigated by micro-Raman spectroscopy and analytical modelling. The in-situ micro-Raman investigations showed that the fracture strength of the coating is ∼1.5 GPa, and it contains an initial compressive residual stress of ∼-5.4 GPa which can be reduced by the application of uniaxial tensile strain. At higher strains, the compressive stress was transformed into the tensile regime and cracks appeared in the coating, followed by a reduction in crack spacing and finally delamination. The stress measurements across different cracked coating segments, using Raman spectroscopy, indicated tensile stresses at the middle and compression near the edges of the segment under tensile load. Coating fragmentation leads to a relaxation of the stress within the cracked coating segment. Further cracking of the smaller segments requires larger strains. Here, the classical shear lag model was extended to derive the stress distribution in the coating bonded to the substrate, considering both residual stress and cracking using a fracture criterion. The effect of substrate plasticity on the evolution of residual stress and on the cracking behaviour of the coating is also introduced. A good agreement is found between the modelling approach and the measured failure behaviour as well as the stress distributions in the fractured diamond segments. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.



FAU-Autoren / FAU-Herausgeber

Ahmed, Furqan
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Neuerer, Katharina
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Durst, Karsten PD Dr.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Göken, Mathias Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Rosiwal, Stefan PD Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)


Zitierweisen

APA:
Ahmed, F., Bayerlein, K., Rosiwal, S., Göken, M., & Durst, K. (2011). Stress evolution and cracking of crystalline diamond thin films on ductile titanium substrate: Analysis by micro-Raman spectroscopy and analytical modelling. Acta Materialia, 59(14), 5422-5433. https://dx.doi.org/10.1016/j.actamat.2011.05.015

MLA:
Ahmed, Furqan, et al. "Stress evolution and cracking of crystalline diamond thin films on ductile titanium substrate: Analysis by micro-Raman spectroscopy and analytical modelling." Acta Materialia 59.14 (2011): 5422-5433.

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Zuletzt aktualisiert 2018-10-08 um 15:54