The driving force governing room temperature grain coarsening in thin gold films

Year: 
2016
Month: 
11
Pages: 
42-45
DOI: 
10.1016/j.scriptamat.2016.11.012
Type: 
Journal Articles
Journal: 
Scripta Materialia
Volume: 
130
Abstract: 

Strong room-temperature grain coarsening in gold films on polyimide induced by cyclic uniaxial mechanical strain is demonstrated. Detailed electron backscatter diffraction analysis revealed that, in contrast to the predictions of shear-coupled grain boundary migration model, the grain coarsening is isotropic and coarsened grains do not exhibit any specific crystallographic orientations or misorientations to the neighboring grains. It is shown that a thermodynamic model where the driving force appears due to the difference in yield stresses between the grains with different sizes provides an adequate explanation of the experimental data.