Cluster dynamics modeling of irradiation growth in single crystal Zr

Li, Yang; Ghoniem, Nasr

doi:10.1016/j.jnucmat.2020.152312

Cluster dynamics modeling of irradiation growth in single crystal Zr

Journal Article · Tue Jul 14 00:00:00 EDT 2020 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2020.152312· OSTI ID:1852651

Li, Yang ^[1]; Ghoniem, Nasr ^[2]

Univ. of California, Los Angeles, CA (United States). Dept. of Materials Science and Engineering; Univ. of California, Los Angeles, CA (United States)
Univ. of California, Los Angeles, CA (United States). Dept. of Materials Science and Engineering

Irradiation growth of single-crystal Zr is modeled with a reduced set of cluster dynamics equations. Nucleation and growth of basal and prismatic dislocation loops are both accounted for in the model. Equations are developed for the time evolution of single point defects, a limited number of point defect clusters, interstitial and vacancy loop nucleation rates, as well as for the growth of vacancy loops on basal planes and interstitial loops on prismatic planes. Reduction of the usual infinite hierarchy of cluster dynamics equations to the simple set studied here is justified on the physical basis of the stability of small loops once nucleated. This simplified cluster dynamics model with a small number of adjustable parameters avoids the complexity of explicit representation of higher order point defect clusters. The model shows consistency with experimental observations of the following aspects: (1) the growth rates of Zr crystals along the a- and c-axes; (2) the onset dose for breakaway irradiation growth; (3) the saturation dislocation loop densities of vacancy and interstitial loops; (4) the effects of cold work and temperature on irradiation growth.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0018410

OSTI ID:: 1852651

Alternate ID(s):: OSTI ID: 1664485

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: C Vol. 540; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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