|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||On a Precipitation Damage Meter to Quantify Dose Rate and Damaging Particle Effects on Ion and Neutron Irradiated RPV Steels
||Takuya Yamamoto, Peter Wells, Yuan Wu, Nathan Almirall, G. Robert Odette, Hideo Watanabe, Kenta Murakami, Takeshi Toyama, Yasuyoshi Nagai
|On-Site Speaker (Planned)
Self-ion and neutron irradiations were used to quantify dose rate/damaging particle effects on precipitation in a set of RPV alloys. Here, 2.8MeV Fe-ion irradiations performed in HIT facility (University of Tokyo) at 10<sup>-4</sup> to 10<sup>-5</sup> dpa/s were combined with neutron irradiated (IVAR, BR2 and ATR) alloy conditions for dose rates from 10<sup>-7</sup> to 10<sup>-10</sup> dpa/s. PIE included APT, TEM and PAS. Significant delays in the precipitate volume fraction (f) versus dpa were observed in the ion versus neutron conditions. The f(dpa) data, spanning a factor of 10<sup>6</sup> in dpa rates, collapse into one trend band when plotted on an effective dpa<sub>e</sub> scale that considers both vacancy-interstitial recombination by various mechanisms, and excess hardening by defect-solute complexes formed in displacement cascades. The quantification of a rate/particle dependent effective radiation dose using f as a “damage meter” is a new powerful tool in quantifying and understanding ion versus neutron irradiation effects.
||Planned: A print-only volume