Phase transformation mechanism in irradiation-induced superlattice formation

被引：0

作者：

Aagesen, Larry K. ^{[1
]}

Zhang, Yongfeng ^{[2
]}

Jiang, Chao ^{[1
]}

Gan, Jian ^{[3
]}

机构：

[1] Idaho Natl Lab, Computat Mech & Mat Dept, POB 1625, Idaho Falls, ID 83415 USA

[2] Univ Wisconsin, Dept Nucl Engn & Engn Phys, Madison, WI 53706 USA

[3] Idaho Natl Lab, Adv Characterizat Dept, POB 1625, Idaho Falls, ID 83415 USA

来源：

COMPUTATIONAL MATERIALS SCIENCE | 2025年 / 246卷

关键词：

Void; Gas bubble; Superlattice; Kinetic Monte Carlo; Nucleation; Spinodal; Radiation; VOID LATTICE FORMATION; GAS-BUBBLE SUPERLATTICE; SELF-ORGANIZATION; INTERSTITIAL DIFFUSION; SIMULATIONS; MOLYBDENUM; ALLOYS; METALS;

D O I：

10.1016/j.commatsci.2024.113418

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Atomic kinetic Monte Carlo simulations were used to model void superlattice formation under irradiation in molybdenum, driven by anisotropic diffusion of self-interstitial atoms. A change in the phase transformation mechanism from nucleation and growth to spinodal decomposition occurred with increasing dose rate, with both mechanisms leading to superlattice formation. Analysis of a rate-theory based analytical model showed that an observed change in the kinetics of vacancy accumulation, the appearance of a region of positive second derivative in the plot of average vacancy concentration versus time, was caused by the onset of spinodal instability. The analytical model showed that for molybdenum and several other metals where void superlattice formation is commonly observed, the phase transformation likely occurs by nucleation and growth. However, nickel may offer the possibility of experimental observation of the transition between phase transformation mechanisms.

引用

页数：13

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