On the critical temperature required for grain boundary sliding in Nickel bicrystal: A micromechanical approach

Despite several decades of research on grain boundary sliding and its fundamental mechanisms, two questions remain: What is the critical temperature at which a grain boundary begins to slide, and what is its physical significance? Here, we determine the critical temperature for grain boundary sliding in a high-angle Ni grain boundary by employing an in situ high temperature micropillar compression in a scanning electron microscope (SEM). Regardless of the high melting point of Ni, grain boundary