Abstract
Hexagonal γNb5Si3 plates have precipitated from Nb solid solution in heat-treated Nb-Si based ultrahigh temperature alloys. The orientation relationships (ORs) and interfacial structures between γNb5Si3 precipitates and Nb solid solution matrix have been investigated by high-resolution transmission electron microscopy (HRTEM). The ORs have been determined as [111]Nb//[0001]γ and (101¯)Nb//(11¯00)γ with a near coherent interface. The interfacial structure has been interpreted with the Coincidence site lattice/Displacement shift complete lattice (CSL/DSC) model, forming an array of phase boundary dislocations (PBDs) on the interface. PBDs with Burgers vectors of b→=13<1¯21¯>Nb on (111)Nb plane might promote the precipitation of γNb5Si3.
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