Sudden transition of dislocation dynamics in FCC crystals at ultralow temperatures

摘要: Abstract Dislocation mobility, which is a fundamental unit of material plasticity, determined by the predominant drag mechanism during dislocation motion. For edge dislocations in various FCC crystals, we first discover through molecular dynamics simulation that velocity abruptly changes at certain ultralow temperatures between 0.01 K and 10 K. We reveal this sudden change due to oscillation mode, such mode caused transition mechanism. Furthermore, verify crystals do not depend on properties but are characterized fixed ratio frequency maximum perfect lattice. Therefore, our findings indicate description crystal plasticity might be unifiable independent materials suggest possibility further application other materials.