|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Ultrafine-grained and Heterostructured Materials (UFGH XII)
||Comparing the Thermal, Mechanical, and Radiation Stability of Nanocrystalline Platinum-Gold
||Khalid Hattar, Alejandro Barrios Santos, Emily Hopkins, Christopher M. Barr, James E. Nathaniel, Elton Chen, Chongze Hu, Remi Dingreville, Daniel C. Bufford, David P. Adams, Doug Medlin, Fadi Abedljawad, Brad L. Boyce
|On-Site Speaker (Planned)
Grain-size stability is essential to maintain the unique properties associated with ultrafine-grained and nanocrystalline metals. Binary alloying is a simple and effective means to drastically improve the grain-boundary stability. In this study, we explored and compared the thermal, mechanical, and ion irradiation stability of a model binary system, nanocrystalline platinum-gold. In-situ TEM annealing experiments showed that increasing alloy concentration results in less grain growth during heating. In-situ SEM fatigue experiments demonstrated that grain growth dominates failure mechanisms in pure Pt, while intergranular cracking governs Pt-Au alloy failures. In-situ and ex-situ heavy ion irradiation have shown extensive grain growth occurring in both systems, which can be attributed directly to the displacement damage. Analyzed with modeling results, these results suggest that it is extremely important to consider grain-boundary stability in the expected operating environment, as boundaries are not all equivalent. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.
||Characterization, Modeling and Simulation, Thin Films and Interfaces