|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||An Experimental Study to Elucidate Stage IV Recovery Mechanism of Heavy Ion Irradiated High Purity Molybdenum
||Di Yun, Jeffrey Terry, Yinbin Miao, Joshua Wright, Kevin Logan, Zhigang Mei, Kun Mo, Walid Mohamed, Bei Ye, Michael Pellin, Abdellatif Yacout
|On-Site Speaker (Planned)
The mechanisms of stage I, II and III recovery in pure Molybdenum (Mo) have been extensively studied. A recovery stage IV has been observed with heavy ion irradiated high purity Mo. Different mechanisms have been proposed to explain the underlying physics of the stage IV recovery. In this work, Extended X-ray Absorption Fine Structure (EXAFS) technique was applied to characterize heavy ion irradiation induced microstructure in single crystal Mo. The change of Coordination Number (CN) with respect to different Mo nearest neighbor shells has shed insights to the nature of defect clusters . Besides the regular Mo peaks, an additional short bond distance peak in the R-space spectra was discovered and was correlated with Mo-Mo dumbbells. The behaviors of these Mo-Mo dumbbells provided evidence for a di-interstitial mechanism for the stage IV recovery. In situ TEM annealing experiment has also been conducted to gain further evidence to support this mechanism.
||Planned: A print-only volume