Partial dislocation emission in a superfine grained Al-Mg alloy subject to multi-axial compression

We report partial dislocation emission from subgrain boundaries with subgrain size being significantly larger than 100 nm in an Al-Mg alloy. The dislocation density in subgrain boundary has significant effect on partial dislocation emission. The high stacking fault density inside a subgrain is related to the large dislocation density in the subgrain boundary.