Lecture A. Turkin
|01 juni 2004||FWN-Building 5118.-156, Nijenborgh 4, 9747 AG, Groningen|
|Speaker:||Dr. A. Turkin|
|Affiliation:||National Science Center "Kharkov Institute of Physics and Technology"|
|Title:||Phase stability of alloys under irradiation|
|Date:||Tue Jun 1, 2004|
|Host:||H.W. den Hartog, J.T.M. De Hosson, D. Vainchtein|
|Telephone:||+31 50 363 4974|
The stability of second-phase precipitates in a substitutional binary alloy subjected to cascade-producing irradiation is examined. Basic physical mechanisms of phase stability loss under irradiation include
(i) radiation mixing,
(ii) radiation-enhanced diffusion, and
(iii) radiation-induced segregation.
Under irradiation the precipitate growth rate depends strongly on interface structure. The criteria for stability of precipitates are formulated in terms of radiation-altered coherent and incoherent solubilities. The results of phase stability studies are presented on (composition, temperature)- and (temperature, dose rate)-diagrams. The developed model is applied to calculations of diagrams of model alloys Ni-Si, Ni-Al and Al-Zn, as well as of Zr-Nb alloy used as a structural material in thermal reactors. Within the framework of the model the evolution of precipitate size distribution function and other aspects of evolution of phase microstructure are also discussed. The model gives an insight into system behavior at high doses and reveals the material parameters which control the development of phase microstructure.
|Laatst gewijzigd:||22 oktober 2012 14:30|