|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors V
||Temperature Effect of Microstructural Evolution in Advanced Nanostructured Alloys by in-situ Synchrotron X-ray Diffraction
||Yingye Gan, Huijuan Zhao, Di Yun, Kun Mo, David Hoelzer, Xiang Liu, Kuan-Che Lan, Yinbin Miao
|On-Site Speaker (Planned)
Nanostructured ferritic alloys (NFAs) provide exceptional radiation tolerance and high-temperature mechanical properties when compared to traditional ferritic and ferritic/martensitic (F/M) steels. Their remarkable properties result from ultrahigh density and ultrafine size of Y-Ti-O nanoclusters within the ferritic matrix. In this work, we performed the in-situ high-energy synchrotron X-ray diffraction test to study the deformation process of the following NFAs: 14YWT-SM12d, 14YWT-SM7, 14YWT-SM13 and 9YWTV at room temperature and elevated temperatures. The nanoclusters in both 14 YWT and 9YWT were invisible in the measurement due to their non-stoichiometric nature. Due to the size difference of nanoparticles and nanoclusters, the Orowan looping and dispersed-barrier-hardening were considered to be the major strengthening mechanism in the NFAs This analysis was inferred from the different built-up rates of dislocation density when plastic deformation was initiated at various temperatures. Finally, the dislocation densities interpreted from X-ray measurements were successfully modeled using the Bergström’s dislocation models.
||Planned: A print-only volume