Abstract
Fractured C14 (hexagonal close-packed) Laves phase Zr(Fe,Cr)2 precipitates were found in β forged Zircaloy-4. Transmission electron microscopy observations showed that the precipitates were initially a single entity and, during hot forging, underwent fracture along the planes where Peierls stress possibly exceeded fracture stress. Narrow interfacial width of a few nanometres and small misorientation angle in case of each fractured precipitate also implied that the precipitate retained brittle nature at high temperature. The fracture mainly occurred along the c-axes of Laves phase precipitates.
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