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Constitutive response of passivated copper films to thermal cycling

Shen, YL and Ramamurty, U (2003) Constitutive response of passivated copper films to thermal cycling. In: Journal of Applied Physics, 93 (3). pp. 1806-1812.

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The thermomechanical behavior of passivated thin copper films is studied. Stresses in copper films of thickness ranging from 125 to 1000 nm, deposited on quartz or silicon substrates and passivated with silicon oxide, were measured using the curvature method. The thermal cycling spans a temperature range from 2196 to 600 °C. The measured mechanical behavior was found to be rate insensitive within the heating/cooling rate range of 5–25 °C/min. It was observed that the passivated films do not exhibit a significant stress relaxation at elevated temperatures that is normally found in unpassivated films. Furthermore, a significant strain hardening during the course of thermal loading was noted. Simple continuum plasticity analyses show that the experimentally measured stress– temperature response can only be rationalized with a kinematic hardening model. Analytical procedures for extracting the constitutive properties of the films that were developed on the basis of such a model are presented. The initial yield strength is higher and tends to be less temperature dependent in thinner films. The strain hardening rate is found to increase with decreasing film thickness.

Item Type: Journal Article
Publication: Journal of Applied Physics
Publisher: American Institute of Physics
Additional Information: Copyright of this article belongs to American Institute of Physics.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 17 Dec 2008 05:19
Last Modified: 19 Sep 2010 04:53
URI: http://eprints.iisc.ac.in/id/eprint/16683

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