Abstract
The edge-to-edge matching model has been used to predict the orientation relationships (ORs) between crystals that have simple hexagonal-close-packed (HCP) and face-centered-cubic (FCC) structures. Using the critical values for the interatomic spacing misfit along the matching directions and the d-value mismatch between matching planes, a total of seven ORs have been predicted for the most common HCP/FCC metallic systems. However, the ORs that appear more frequently in a particular system depend on the type of matching directions and the interatomic spacing misfit along these directions together with the d-value mismatch between the matching planes. The latter two are related to the lattice parameters of both phases. For example, in the Al/Ag2Al system, three ORs have been predicted. One is \( {\left[ {11\ifmmode\expandafter\bar\else\expandafter\=\fi{2}0} \right]}_{\gamma } //{\left[ {110} \right]}_{\alpha } \), (0002) γ 0.027 deg from\( {\left( {\ifmmode\expandafter\bar\else\expandafter\=\fi{1}11} \right)}_{\alpha } \), which is consistent with the previously reported OR-1. The second is \( {\left[ {11\ifmmode\expandafter\bar\else\expandafter\=\fi{2}0} \right]}_{\gamma } //{\left[ {110} \right]}_{\alpha } ,\,{\left( {1\ifmmode\expandafter\bar\else\expandafter\=\fi{1}01} \right)}_{\gamma }\;0.8\,\deg \) from \( {\left( {\ifmmode\expandafter\bar\else\expandafter\=\fi{1}11} \right)}_{\alpha } \). Due to the larger mismatch values, this OR is not expected to occur frequently and has not been found experimentally to date. Another predicted OR is \( {\left[ {10\ifmmode\expandafter\bar\else\expandafter\=\fi{1}0} \right]}_{\gamma } ||{\left[ {112} \right]}_{\alpha } ,\,{\left( {1\ifmmode\expandafter\bar\else\expandafter\=\fi{2}10} \right)}_{\gamma } 0.25\deg \) from \( {\left( {\ifmmode\expandafter\bar\else\expandafter\=\fi{2}20} \right)}_{\alpha } \). This OR is very close to the reported OR-1. Details of zigzag atom row matching and the principles and process of refining an OR using the Δg conditions are also discussed.
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The authors are grateful to an Australian Research Council (ARC) Discovery Project for financial support.
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Manuscript submitted May 24, 2007.
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Zhang, MX., Chen, SQ., Ren, HP. et al. Crystallography of the Simple HCP/FCC System. Metall Mater Trans A 39, 1077–1086 (2008). https://doi.org/10.1007/s11661-008-9497-2
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DOI: https://doi.org/10.1007/s11661-008-9497-2