Abstract
In this work, the coupled motion of two different phases of Σ 5(210)[001] grain boundaries was investigated by molecular dynamics simulations of fcc Cu. The effect of interfacial structural phase transitions is shown to have a profound effect on both the shear strength and the nature of the coupled motion. Specifically, the motion of the two different phases is described by ideal coupling factors β⟨100⟩ and β⟨110⟩ that have different magnitudes and even signs. Additionally, the shear strength for the two interfacial phases is observed to differ by up to 40% at the lowest temperatures simulated. The study demonstrates that grain boundary phases transitions may have strong effects on the kinetics of microstructural evolution.
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