|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Long Term Grain Growth Behavior of Ir-Alloy DOP-26*
||Govindarajan Muralidharan, Dean T Pierce, Ethan E Fox, Seth Lawson, Cecil A Carmichael, Easo P George, George B Ulrich
|On-Site Speaker (Planned)
DOP-26, an Ir-alloy has been successfully used as a fuel-cladding material in radioisotope thermoelectric generators. Grain size has a significant effect on the high temperature, high strain rate impact ductility of this alloy. Although it is known that Ir-Th intermetallic precipitates limit grain growth in this alloy, the relationship between precipitate sizes and limiting grain sizes has not been evaluated. Grain growth behavior was characterized in DOP-26 sheet specimens for times up to 10,000 hours at 1300 and 1400 °C. Grain size, grain size distribution, and grain aspect ratio were measured as a function of time at temperature. This talk will outline the effect of temperature on the kinetics of grain growth along with relationships observed between limiting grain sizes and precipitate characteristics. Research sponsored by Office of Space and Defense Power Systems at the Oak Ridge National Laboratory, managed by UT-Battelle, LLC for the U.S. Department of Energy.