Amorphous intergranular films act as ultra-efficient point defect sinks during collision cascades

SCRIPTA MATERIALIA

卷:110

Article

Ludy, Joseph E.¹  Rupert, Timothy J.^1,2 

[1] Univ Calif Irvine, Dept Mech & Aerosp Engn, Irvine, CA 92697 USA

[2] Univ Calif Irvine, Dept Chem Engn & Mat Sci, Irvine, CA 92697 USA

关键词: Grain boundaries;    Interface structure;    Molecular dynamics (MD);    Nanocomposite;    Amorphous intergranular films;   

DOI  :  10.1016/j.scriptamat.2015.07.040

来源: Elsevier

【 摘 要 】

Atomistic simulations are used to explore the effect of interfacial structure on residual radiation damage. Specifically, an ordered grain boundary is compared to a disordered amorphous intergranular film, to investigate how interface thickness and free volume impacts point defect recombination. Collision cascades are simulated and residual point defect populations are analyzed as a function of boundary type and primary knock on atom energy. While ordered grain boundaries easily absorb interstitials, these interfaces are inefficient vacancy sinks. Alternatively, amorphous intergranular films act as ultra-efficient, unbiased defect sinks, providing a path for the creation of radiation-tolerant materials. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free