|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Thermal and Mechanical Stability of Nanocrystalline Materials
||The Mechanisms of Thermal Stability and Strength of Nanocrystalline Immiscible Alloys
||K. A. Darling, K. Solanki, R. Koju, Yuri Mishin
|On-Site Speaker (Planned)
The immiscible nanocrystalline Cu-Ta produced by cryogenic mechanical alloying demonstrate an extraordinary high-temperature stability of the microstructure and a high strength under both tension and compression. Many of the unusually properties of such alloys are due to the precipitation of nanometer-scale Ta-based clusters coherent with the Cu matrix. These clusters impose strong resistance to dislocation glide, pin grain boundaries in place, and effectively block grain boundary motion and grain rotation. This talk will present an overview of the recent progress experimental studies (APT, TEM/SEM, DSC, mechanical testing) and atomistic computer simulations (MD and Monte Carlo) aimed to understand the fundamental mechanisms of the Ta cluster effect. The remarkable properties of this truly stabilized nanocrystalline material will be reviewed, including the unusually small strain rate sensitivity, the limited strain hardening, the suppression of superplasticity, the lack of coarsening of the Ta clusters even at high temperatures.
||Planned: Supplemental Proceedings volume