Stacking faults observed in {10[formula omitted]2} extension twins in a compressed high Sn content Zr alloy

Abstract

‘Anomalous’ stacking faults within {101−2} extension twins were extensively observed in a high Sn content Zr alloy ‘Excel’ after uniaxial compression testing. TEM characterization on these stacking faults shows that there are three types of stacking faults: basal, prismatic, and pyramidal stacking faults. Basal stacking faults usually cross a twin and have either both ends or at least one end connected to a twin boundary. A high-density of pyramidal or prismatic stacking faults are observed close to a twin boundary, and some discrete occurrences of these types of stacking faults are observed detached from the twin boundary.