Assessment of stress relaxation experiments on diamond coatings analyzed by digital image correlation and micro-Raman spectroscopy

Ahmed F, Krottenthaler M, Schmid C, Durst K (2013)

Publication Type: Journal article

Publication year: 2013

Journal

Surface & Coatings Technology Elsevier

Book Volume: 237

Pages Range: 255-260

DOI: 10.1016/j.surfcoat.2013.07.025

Abstract

The analysis and control of residual stresses are important for understanding the fracture and delamination behavior of coatings and thin films. In this work, the stress relaxation in microcrystalline diamond coatings after focused ion beam (FIB) milling was assessed by micro-Raman spectroscopy and digital image correlation. Using the FIB, the so called H-Bar geometry was milled in the diamond coating. The cutting introduced a strain relief in the coating perpendicular to the longer sides of the bar. The relaxation strains were recorded from high resolution scanning electron microscopy images of the H-Bar before and after FIB cutting. Using finite element modeling of the milled geometry, the residual stress level in the coating is evaluated from the relaxation strains. Furthermore, \textgreekm-Raman spectroscopy was used to assess the biaxial residual stress level in the coating before and after FIB cutting. The \textgreekm-Raman signal inside the bar showed strong incidence for stress relaxation and confirmed to some extent the applicability of the FIB--DIC method.

Authors with CRIS profile

Furqan Ahmed Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Markus Krottenthaler Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Christoph Schmid Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Karsten Durst

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

GRK 1229: Stabile und metastabile Mehrphasensysteme bei hohen Anwendungstemperaturen April 1, 2006 - March 30, 2015

Involved external institutions

Technische Universität Darmstadt DE Germany (DE)

How to cite

APA:

Ahmed, F., Krottenthaler, M., Schmid, C., & Durst, K. (2013). Assessment of stress relaxation experiments on diamond coatings analyzed by digital image correlation and micro-Raman spectroscopy. Surface & Coatings Technology, 237, 255-260. https://dx.doi.org/10.1016/j.surfcoat.2013.07.025

MLA:

Ahmed, Furqan, et al. "Assessment of stress relaxation experiments on diamond coatings analyzed by digital image correlation and micro-Raman spectroscopy." Surface & Coatings Technology 237 (2013): 255-260.

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