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Kinetics of Phase Separation Along Stable Trajectories
Abstract The phase separation kinetics of dilute Al-(Zn,Mg) alloys were studied by small-angle and diffuse neutron scattering techniques and the mean cluster radius R as well as the volume fraction V of the solute-rich phase were determined. It could be shown that, within (R,V)-space, the decomposition corresponds to a trajectory, which is stable against small perturbations. Using a simple two-phase model, this trajectory appears as a “valley” of the free energy of the system. When this model is extended to concentrated alloys such a valley still exists in the free energy as function of the different system parameters. During evolution along this valley a time-scaling of the system is obtained. In fact all parameters of the two-phase model, like composition and volume fraction of the phases or the total interphase-surface must be functions of a scaling parameter R, which for dilute alloys, can be identified as the average cluster radius.
Kinetics of Phase Separation Along Stable Trajectories
Abstract The phase separation kinetics of dilute Al-(Zn,Mg) alloys were studied by small-angle and diffuse neutron scattering techniques and the mean cluster radius R as well as the volume fraction V of the solute-rich phase were determined. It could be shown that, within (R,V)-space, the decomposition corresponds to a trajectory, which is stable against small perturbations. Using a simple two-phase model, this trajectory appears as a “valley” of the free energy of the system. When this model is extended to concentrated alloys such a valley still exists in the free energy as function of the different system parameters. During evolution along this valley a time-scaling of the system is obtained. In fact all parameters of the two-phase model, like composition and volume fraction of the phases or the total interphase-surface must be functions of a scaling parameter R, which for dilute alloys, can be identified as the average cluster radius.
Kinetics of Phase Separation Along Stable Trajectories
Fratzl, Peter (author) / Blaschko, Oskar (author)
1988-01-01
9 pages
Article/Chapter (Book)
Electronic Resource
English
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