ABSTRACT

A mechanism of dislocation multiplication is introduced. The surface of the Al₂₀Cu₂Mn₃ phase in an Al alloy can act as a barrier to impede dislocation movement. When two dislocations with opposite Burgers vectors approach each other, dislocations can annihilate if the pair remains at a distance less than the critical distance for annihilation. A dislocation loop is then formed around the Al₂₀Cu₂Mn₃ phase or dislocations interact with the loop forming a dislocation tangle, which can promote dislocation multiplication. The driving force for dislocation reproduction, the dislocation glide velocity and the rate of dislocation multiplication are discussed.

摘要

介绍了一种位错倍增机制。铝合金中Al ₂₀ Cu ₂ Mn ₃相的表面可以作为阻挡位错运动的屏障。当两个具有相反 Burgers 矢量的位错相互接近时，如果该对的距离小于湮灭的临界距离，则位错可以湮灭。_{然后在Al 20} Cu ₂ Mn ₃相周围形成位错环或位错与环相互作用形成位错缠结，这可以促进位错倍增。讨论了位错再生的驱动力、位错滑移速度和位错倍增率。