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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Solid State Precipitation
Presentation Title Formation of Complex Intermetallic Phases from Supersaturated Co Solid Solution in a Co-3.9Nb Alloy
Author(s) Toshiaki Horiuchi, Frank Stein, Kohei Abe, Shunsuke Taniguchi
On-Site Speaker (Planned) Toshiaki Horiuchi
Abstract Scope The present study aimed at an investigation of the precipitation behaviour of complex monoclinic intermetallic phase Nb2Co7 from supersaturated Co solid solution in order to understand its formation process and morphology. The Co-3.9 at.%Nb alloy was solution heat treated at 1240oC resulting in a single-phase fcc-Co solid solution and was subsequently cooled to various temperatures for isothermal heat treatments. A distinct Widmannstätten-like discontinuous precipitation microstructure was observed after isothermal heat treatment at 900oC, and the underlying Co matrix was found to have an hcp structure in contrast to the expectations from the equilibrium phase diagram. On the other hand, the Co matrix after direct cooling from 1240oC to room temperature has an fcc structure and contains finely dispersed L12 ordered regions with a significantly increased Nb content, what indicates the occurrence of a metastable intermediate phase during this solid state reaction in the Co-Nb system.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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Effects of Clustering and Trace Elements on Precipitation Hardening of Al-Mg-Si Alloys
Formation of Complex Intermetallic Phases from Supersaturated Co Solid Solution in a Co-3.9Nb Alloy
Hydride Precipitates in Zirconium Alloys: Evolution of Dissolution and Precipitation Temperatures during Thermal Cycling Correlated to Microstructure Features
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