Mechanical properties and microstructures of Al-Cu Thin films with various heat treatments |
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Authors: | Young-Chang Joo |
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Affiliation: | (1) Max-Planck-Institut für Metallforschung, 70174 Stuttgart, Germany |
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Abstract: | The relationship between microstructure and mechanical properties has been investigated in Al-Cu thin films. The Cu content
in Al-Cu samples used in this study ranges from 0 to 2 wt.% and substrate curvature measurement was used to measure film stress.
In thin films, the constraints on the film by the substrate influence the microstructure and mechanical properties. Al-Cu
thin films cooled from high temperatures have a large density of dislocations due to the plastic deformation caused by the
thermal mismatch between the film and substrate. The high density of dislocations in the thin film enables precipitates to
form inside the grain even during a very rapid quenching. The presence of a large density of dislocations and precipitates
will in turn cause precipitation hardening of the Al-Cu films. The precipitation hardening is dominant at lower temperatures,
and solid solution hardening is observed at higher temperatures in the tensile regime. Pure Al films showed the same values
of tensile and compressive yield stresses at a given temperature during stress-temperature cycling. |
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Keywords: | aluminum copper alloy thin film hardening precipitation dislocation |
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