|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Weldability and Weld Properties in Iridium Alloys
||Roger G. Miller, George B. Ulrich, Govindarajan Muralidharan
|On-Site Speaker (Planned)
||Roger G. Miller
DOP-26 is an iridium alloy that balances mechanical properties and weldability and is the current alloy used to encapsulate fuels for radioisotope thermoelectric generators. The weldability of iridium alloys is limited by the thorium level due to hot cracking susceptibility with high energy density welding processes being more tolerant to higher levels of thorium. Similar to weldments in many other refractory metal systems, the high melting point and purity of DOP-26 results in weld microstructures that degrade high temperature weld properties. This talk will discuss the weldability of iridium alloys with respect to thorium levels and the techniques used to improve weldability and weld properties. Additionally, current research to potentially increase weld properties and methods of evaluating weld structures will be outlined.
Research sponsored by the 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.