Grain coalescence and its effect on stress and elasticity in nanocrystalline metal films

An approach based on the grain coalescence mechanism is developed to explain and predict the elastic behavior (and stress) of nanocrystalline films. The model explains how, under an external strain, coalescence and decoalescence at grain boundaries alter the stress state of the film, thereby reducin...

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Bibliographic Details
Published in:Acta materialia 2007-02, Vol.55 (3), p.777-784
Main Authors: Shamsutdinov, N.R., Böttger, A.J., Thijsse, B.J.
Format: Article
Language:English
Subjects:
Applied sciences
Elastic behavior
Exact sciences and technology
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metal films
Metals. Metallurgy
Nanocrystalline microstructure
Stress
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Summary:An approach based on the grain coalescence mechanism is developed to explain and predict the elastic behavior (and stress) of nanocrystalline films. The model explains how, under an external strain, coalescence and decoalescence at grain boundaries alter the stress state of the film, thereby reducing the film’s effective Young’s modulus. An assessment of the effect of coalescence at grain boundaries could be made on the basis of the analysis of the contributions of grain boundary and strain energies. The estimations of Young’s modulus and stress based on the model are in agreement with the data experimentally observed for sputtered iron nanocrystalline films.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2006.07.004