|About this Abstract
||MS&T21: Materials Science & Technology
||Probing Defect Properties and Behavior under Mechanical Deformation and Extreme Conditions
||Long-range One-dimensional Glide of Defect Clusters in Irradiated Materials: Experimental Evidence and Consequences
||Steven J. Zinkle, Ling Wang, Yan-Ru Lin
|On-Site Speaker (Planned)
||Steven J. Zinkle
Multiple molecular dynamics simulations and limited in-situ TEM experimental studies have reported evidence for high mobility of vacancy or interstitial defect clusters, with preferential one-dimensional (1D) glide. However, the relative fraction of glissile clusters and their impact on overall defect microstructural evolution in irradiated materials is not well quantified. Experimental in-situ and ex-situ observations of radiation induced loss of precipitate coherency over a wide range of irradiation temperatures and precipitate sink strengths, along with observations of void and dislocation loop behavior in the vicinity of planar defect sinks (grain boundaries and surfaces) will be summarized. Analysis of these results indicates that 1D glide of interstitial clusters is particularly significant when the matrix sink strength is below ~1x1014/m2. At higher matrix sink strengths, effects associated with 1D glide rapidly become less noticeable. The practical impact of 1D defect cluster glide on understanding microstructural evolution of irradiated materials will be discussed.