|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Computational Thermodynamics and Kinetics
||Nb Precipitation in ZrNb Alloys
||Maeva Cottura, Emmanuel Clouet
|On-Site Speaker (Planned)
Precipitates are very effective in strengthening metallic alloys because they act as obstacles to dislocation motion. A key factor that controls the alloy mechanical properties is the precipitate morphology. In ZrNb alloys, currently employed in nuclear power plants, niobium precipitation occurs under irradiation. Coherent Nb nano-precipitates (bcc) presenting a platelet shape lying in the basal plane appear in the Zr matrix (hcp). Our aim is to investigate the different factors that might control the morphology of the precipitates, i.e. the interfacial and elastic strain energies.
First, an ab-initio study of coherent Zr/Nb interfaces has been carried out to evaluate the anisotropy of the interface energies. The favored interfaces are compared to interfaces evidenced by HREM. Then, the elastic energy for the Zr/Nb system has been determined from the continuum elasticity theory. The energetic informations will be sufficient to predict the precipitate equilibrium morphology and compare it to experimental observations.
||Planned: A print-only volume