SUPERPLASTIC MECHANISM OF Al-Zn-Mg ALLOYS CONTAINING SMALL AMOUNTS RARE-EARTHS
含微量稀土元素的Al-Zn-Mg合金的超塑变形机制

The configurations and the motions of grain boundary dislocations(GBD)andthe interations of the GBD with the precipatation particles in the grain boundary(GB)were ob-served with the TEM.It was found that the motions of the GBD along the GB can be hindered