In-situ characterization of lattice structure evolution during phase transformation of Zr-2.5Nb
No Thumbnail Available
The alpha-beta phase transformation behavior of Zr-2.5Nb (in mass%) has been characterized in real time during an in situ neutron diffraction experiment. The Zr-2.5Nb material in the current study consists, at room temperature, of alpha-Zr phase (hcp) and two beta phases (bcc), a Nb rich beta-Nb phase and retained, Zr rich, beta-Zr(Nb) phase. It is suggested that this is related to a quench off the equilibrium solubility of Nb atoms in the Zr bcc unit cells. Vegard's law combined with thermal expansion is applied to calculate the composition of the beta-phase, which is compared with the phase diagram, revealing the system's kinetic behavior for approaching equilibrium. © 2011, Wiley-Blackwell.
Phase transformations, Neutron diffraction, OPAL Reactor, Diffractometers, Zirconium alloys, Kinetics
Yan, K., Carr, D.G., Kabra, S., Reid, M., Studer, A., Harrison, R.P., Dippenaar, R., Liss, K.D. (2011). In situ characterization of lattice structure evolution during phase Transformation of Zr-2.5Nb. Advanced Engineering Materials, 13(9); 882-886. doi:10.1002/adem.201000350