|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Design of High Temperature RCCAs using Ordered Thermally Stable Structures
||Jaimie Tiley, Soumya Nag, Ke An, Ercan Cakmak, Jonathan Poplawsky, Raymond Unocic, Sriswaroop Dasari, Rajarshi Banerjee
|On-Site Speaker (Planned)
Meta-stable and heterogenous structures within refractory complex concentrated alloys (RCCAs) provide creative new strengthening mechanisms for material use within extreme environments. The use of ordered structures and chemical segregation coupled with heterogenous phase nucleation sites produced through processing allows increased tailoring of specific microstructures. This research investigates the impact of Ti and Al additions and thermo-mechanical-processing on the formation of heterogeneous B2 and related ordered structures within a HfNbTaZr equi-atomic alloy, including the subsequent impact on mechanical properties. Potential compositions for a new candidate high temperature RCCA were determined through validated CALPHAD models. Samples were produced and evaluated by coupled characterization using neutron and X-ray diffraction, atom probe tomography, transmission electron microscopy, and mechanical testing at elevated temperatures. Atom probe tomography was conducted at ORNL’s Center for Nanophase Materials Science, a Department of Energy Office of Science user facility.