, Volume 39, Issue 5, pp 956-963,
Open Access This content is freely available online to anyone, anywhere at any time.
Date: 01 Nov 2007

Vacancy Cluster: Helium Synergy in Void Nucleation


Vacancy clusters produced in displacement cascades may capture helium to give void nucleation. Rate equations are derived for such nucleation. Most of the helium is captured and sequestered early on in most irradiations by a low number density of small voids. This capture may terminate void nucleation early in irradiation, in agreement with many experimental studies.

This article is based on a presentation given in the symposium entitled “Solid-State Nucleation and Critical Nuclei during First Order Diffusional Phase Transformations,” which occurred October 15–19, 2006 during the MS&T meeting in Cincinnati, Ohio under the auspices of the TMS/ASMI Phase Transformations Committee.