Formation of Double Layer Stacking Fault Dislocation Loops

Abstract

The formation conditions and mechanism of double layer stacking fault dislocation loops have been studied experimentally. It is found that slow quenching such as quenching into oil or re-quenching to lower temperature liquid immediately after quenching are favored for the double layer loop formation. It is confirmed that double layer loops are formed by additional forming another faulted loop on the plane which is one atomic distance apart from the original faulted loop. Possible reasons for the preferential formation of the newly formed faulted loop are considered. This double layer loop formation implies that some thermal equilibrium vacancy clusters in aluminum have a collapsed structure.