Abstract
The trigonal/bcc orientation relationships (ORs) and their likelihood of occurrence are extensively studied using dispersed Y4Zr3O12 (δ) nano-precipitates in bcc Fe (α) matrix by means of transmission electron microscopy, image simulations and a crystallographic model. Two orientation relationships related by a rotation: [12̄0]δ||[111]α with (212̄)δ||(1̄10)α and [12̄0]δ||[111]α with (003̄)δ||(1̄10)α, are established and periodic arrays of misfit dislocation doublets are identified at the strained interface in (110)α for both ORs. Further eighteen energetically feasible ORs in Y4Zr3O12/bcc system are deduced by combining stereographic projections, which include the two predominant ORs in this study and other ORs in literature. The orientation relationship which generates interface with a minimum number of dislocation doublets is the most frequent. The precipitate size dependence of ORs and the role of predominant OR in strengthening mechanism are discussed.
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