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Determination of growth-induced strain and thermo-elastic properties of coatings by curvature measurements
Luleå tekniska universitet.
Department of Materials Science, Uppsala University.
2002 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 336, no 1-2, p. 7-21Article in journal (Refereed) Published
Abstract [en]

Curvature measurements on bimaterial specimens are examined for determination of residual strain/stress and thermo-elastic properties of coatings and layered materials. By using specimens with material layers of comparable thickness, large deflections and thereby high measurement accuracy are obtained. Strain-curvature relations are given for beam and plate specimens at different deformation modes. A robust fitting method for simultaneous determination of the mismatch strain and the modulus of elasticity is described. Experiments are performed on a titanium nitride (TiN) coating deposited on a thick high-speed steel substrate by PVD. The modulus of elasticity and the thermal expansion coefficient for the TiN coating are determined to 500 GPa and 7.4 x 10 exp -6 K exp -1 , respectively. The characteristic residual stress, i.e. the thin-film stress at room temperature, is -3.8 GPa, for this material combination and deposition conditions. The temperature independent growth-induced strain is determined to -0.0045, which is 75% of the mismatch strain at room temperature.

Place, publisher, year, edition, pages
2002. Vol. 336, no 1-2, p. 7-21
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-10015DOI: 10.1016/S0921-5093(01)01979-7ISI: 000178737900002Scopus ID: 2-s2.0-0037174893Local ID: 8c3bd790-9143-11db-8975-000ea68e967bOAI: oai:DiVA.org:ltu-10015DiVA, id: diva2:982955
Note
Validerad; 2002; 20061221 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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