|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Thermal and Mechanical Stability of Nanocrystalline Materials
||Initiation and Stagnation of Room-temperature Strain-induced Grain Coarsening in Thin Au Films
||Oleksandr Glushko, Rafael Soler, Gerhard Dehm
|On-Site Speaker (Planned)
In this presentation a systematic overview of room temperature grain coarsening induced in ultra-fine grained polymer-supported gold films by cyclic mechanical strain will be given. The collective grain coarsening effect will be explored by considering the evolution of the average grain size with the cycle number for three film thicknesses and three applied strain amplitudes. It will be shown that activation of the grain coarsening depends on the initial grain size, the width of the initial grain size distribution, and applied strain amplitude. Depending on the film thickness, the two different mechanisms of grain coarsening stagnation will be discussed. Both initiation and stagnation of strain-induced grain coarsening will be explained in the frameworks of recently proposed [O. Glushko, M. Cordill, Scripta Mater. 130, 42, 2017] thermodynamic driving force model. The values of the driving forces required to activate grain coarsening were estimated to lie between 0.5 and 1 MJ/m^3.
||Planned: Supplemental Proceedings volume