“…Examples of this instability include the observation of grain growth, including abnormal grain growth, at temperatures below 600 K in Au [1][2][3], Cu [2], Pd [4], and Ni [5][6][7][8][9][10][11][12]. The observation of abnormal grain growth has been attributed to the initial microstructure, including the distribution of the grain size, misorientation, grain boundary energy and mobility, triple junction mobility, impurities, microstrain, topological features such as curvature and number of boundary faces, etc.…”