An Improved Cluster Dynamics Model for Hydrogen Retention in Tungsten

Abstract

An improved cluster dynamics model has been developed for studying the behaviors of hydrogen retention in tungsten under hydrogen ions irradiation. In addition to di®erent types of objects, adopting up-to-date parameters and complex reaction processes, we newly introduce ion-induced and natural defects into our model. This improved model programmed in IRadMat2 could describe very well the depth distributions and the amounts of hydrogen retained in tungsten under di®erent radiation conditions. The calculated results agree with the experimental ones much better than the previous model, especially for the depth-distribution of D retained in W, which imply that this model is applicable to the evolution of defects especially for low energy high°ux ions irradiated on plasma-facing materials.

Modeling D retention in W under D ions and neutrons irradiation

“…The fundamental physics has been demonstrated in detail in Ref. [18,19,22]. By introducing ion-induced and natural defects, we newly improved the CD model which can describe the behaviors of D in W better.…”

“…Details of the solving procedure were described in Ref. [22]. In practice, the parameters are set as n $ hundreds, M D $ several and N Z $ tenths in general, by considering their respective precipitate size mentioned here.…”

“…The model has been further improved by introducing ion-induced and natural defects in W as described in Ref. [22]. Here, we use the improved model to simulate the dynamic processes of D in W in a long depth and time scale.…”

Hybrid quantum/classical study of hydrogen-decorated screw dislocations in tungsten: Ultrafast pipe diffusion, core reconstruction, and effects on glide mechanism

“…However, the main focus of those studies are the reaction of the material to the heat loads and thermal shock [3][4][5] and H retention [16], as well as interrelations between these phenomena. To fully elucidate the implications of the energy barriers found in this work with experimental data would require mesoscale simulations such as cluster dynamics [63,64], reaction rate theory [65,66], or kinetic Monte Carlo [67,68]. However, these simulations must also account for all other known processes involving H in W, including segregation to void and other interstitial clusters, which is beyond the scope of the current contribution.…”

Cluster dynamics simulation of deuterium retention behaviors in irradiated beryllium

“…The method has been successfully applied to simulate the long-term evolution of the microstructures of materials. [12][13][14][15][16][17] Thus, it is very suitable to use this method to study the defect dynamics evolution in irradiated systems.…”