Abstract
The partly faulted body-centered tetragonal (BCT) SiZr2 nanoparticles in as-cast silicon modified Zircaloy-4 alloy (Zr-1.45Sn-0.19Fe-0.11Cr-0.35Si-0.11 O in wt%) were comprehensively investigated by means of transmission electron microscopy (TEM) and transmission Kikuchi diffraction (TKD) techniques. Nanoparticles (NP), 200–500 nm in length embedded in the α-Zr matrix were frequently observed. The stacking fault plane and corresponding Burgers vector are determined as (110) and 14[11̅1], respectively through atomic configurations taken along different zone axes. Fast Fourier transformation (FFT) patterns acquired by specimen tilting showed that the defects belong to 60° rotation twin with the rotation axis along the [110] direction. The subsequent TKD results also proved the rotation twin. Furthermore, the twin parameters including twin plane (TP) and twin direction (TD) were indexed to be (11̅2̅) and [3̅32̅].
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