Interaction of face-centered cubic phase and twin in Zr-1.0Sn-1.0Nb-0.3Fe alloy

The thermally induced face-centered cubic (FCC) phase and its interactive interface with (10 1 1} twin in Zr-1.0Sn-1.0Nb-0.3Fe alloy were characterized via transmission electron microscopy. The FCC-Zr phase and the matrix have a B-type orientation relationship, however, the interface deviates from the (0 0 01)HCP habit plane. Moreover, the FCC-Zr phase and the twin follow Py-type orientation relationship, namely < 1 2 10 > HCP // < 1 1 0 > FCC and (10 1 1 }HCP //(111 }FCC , which may be attributed to expansion and shuffling adjustment. Although the Py-type orientation relationship between the hexagonal close-packed and the FCC phases in Zr is rarely observed, due to the large crystal plane mismatch, this study provides intuitive evidence of this relationship.(c) 2022 Elsevier B.V. All rights reserved.