Stability of ideal fcc twin boundaries

摘要: Abstract Ideas from continuum mechanics are used to derive an elastic stability inequality for a boundary between two different materials under quasi-static, homogeneous conditions. The terms in this interpreted the case of ideal twinning plane variants face-centered cubic material. High quality potentials Ni and Cu molecular dynamics calculations calibrate relevant energies displacements near plane. It is found that comparison with direct predicts critical stress initiates movement within 1.9% 1.3% Cu. Although predicted calculated stresses only upper bounds more realistic imperfect boundary, give considerable insight into interplay lead motion.