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

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• 作者：O. Glushko^a ; ^{oleksandr.glushko@oeaw.ac.at} ; M.J. Cordill^a ; ^b
• 关键词：Grain coarsening ; Room temperature ; Driving force ; Yield stress ; Texture
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：15 March 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：42-45
• 全文大小：1085 K
• 卷排序：130

文摘

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.