|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||Non-contact Analysis of Dislocation Effects in Single Crystal Niobium and Vacancy Effects in Intermetallic NiAl
||Sara Ferry, Cody Dennett, Michael Short
|On-Site Speaker (Planned)
Transient grating (TG) spectroscopy is explored as a potential in-situ experimental technique to measure radiation damage. Here, TG spectroscopy is used to generate surface acoustic waves (SAWs) on a material surface, which correlate to material property changes. Before TG spectroscopy can deconvolute different mechanisms of radiation damage, experimentally simulated single effects of radiation on a TG signal must first be understood. We present the results of the first two such studies. First, TG signals from cold-worked, single crystal niobium are correlated with dislocation density, with backup measurements via x-ray diffraction (XRD). Second, NiAl specimens of varying compositions, and thus varying vacancy concentrations, are fabricated by arc melting, and the impact of vacancy concentration on the TG signal is examined. Vacancy concentrations are then confirmed via positron annihilation spectroscopy (PAS). Molecular dynamics simulations of each study are also performed, in order to compare predicted behaviors with experimentally measured TG signals.
||Planned: A print-only volume