Stress-induced C14→C15 phase transformation in a Zr(Fe,Cr)2 Laves structured nanophase

Abstract

The C14 (hexagonal close-packed) and C15 (face-centred cubic) close-packed structures are found to coexist in an individual Zr(Fe,Cr)2 Laves structured nanophase in Zircaloy-4 alloy with shear deformation. The orientation relationship between C15 and C14 is [\bar 1 10]C15//[11\bar 20]C14 and (\bar 111)C15//(0001)C14. The stacking faults (SFs) in the C15 structure and the high-density SFs between C15 and C14 have been identified using transmission electron microscopy, which showed they originated on close-packed planes by emission of 1/6〈\bar 2 \bar 1\bar 1〉 Shockley partial dislocations from the phase boundary. Furthermore, the stress-induced C14→C15 phase transformation took place during the shear deformation.