Orientation relationship between Nb and Nb5Si3 (D8l) phases in the eutectoid lamellar microstructure

The crystallography of a Nb/Nb 5 Si 3 lamellar microstructure formed by Nb 3 Si decomposition has been investigated by transmission election microscopy. Upon solidification of a Nb-10 at.% Ti-20 at.% Si alloy, the high-temperature phase Nb 3 Si is retained at room temperature. During annealing at 16...

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Bibliographic Details
Published in:Philosophical magazine letters 2006-02, Vol.86 (2), p.89-98
Main Authors: Sekido¶, N., Wei, F.G., Kimura, Y., Miura, S., Mishima, Y.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Physics
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Summary:The crystallography of a Nb/Nb 5 Si 3 lamellar microstructure formed by Nb 3 Si decomposition has been investigated by transmission election microscopy. Upon solidification of a Nb-10 at.% Ti-20 at.% Si alloy, the high-temperature phase Nb 3 Si is retained at room temperature. During annealing at 1673 K, the Nb 3 Si phase transforms into the Nb and Nb 5 Si 3 (D8 l ) phases with a lamellar microstructure through a eutectoid reaction. The orientation relationship between Nb and Nb 5 Si 3 is determined by selected-area diffraction analyses as , and [133] Nb //[111] Nb5Si3 . The present orientation relationship is explained by good atomic matching on the close-packed planes along the near close-packed directions.
ISSN:0950-0839
1362-3036
DOI:10.1080/09500830600567701