Energy dissipation by grain boundary replacement during grain growth

• DOI: 10.1016/j.scriptamat.2023.115405
• Publication Date: 2023-03-10T16:40:47Z
• Authors: Zipeng Xu; Christopher M. He...; Shiu Fai Li; Jonathan Lind; Robert M. Suter; Fadi Abdeljawad; Gregory S. Rohrer
• Keywords: Grain boundary strengthening

The changes in both the grain boundary area and energy that occur during growth have been measured polycrystalline Ni using high diffraction microscopy. In addition to reduction of area, average decreases as higher boundaries are replaced by lower boundaries. This dissipation mechanism influences migration might explain absence a correlation between curvature velocity. Classical studies isotropic polycrystals based on idea (GB) is driven product GB curvature. [1,2] While support for this foundational concept certainly found bicrystals [3] simulations [4], recent experimental evidence contradicts idea. When curvatures velocities were compared [5] SrTiO3, [6] they be uncorrelated. Similar observations reported α-Fe, [7] where constant proportionality velocity did not behave expected ways. purpose letter present that, growth, replacement GBs dissipates related represents an additional driving force growth. For network comprised N triangular mesh elements ai, total free (F) is: