|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Thermal and Mechanical Stability of Nanocrystalline Materials
||Synthesis, Characterization and Thermal Stability of Nanocrystalline Mg-Zn Thin Films
||Xiujuan Jiang, Libor Kovarik, Arun Devaraj, Mark Bowden, Aashish Rohatgi
|On-Site Speaker (Planned)
Magnesium-based alloys are of great interest as light-weight structural material due to their high specific strength and stiffness. However, their strength decreases at elevated temperatures and thus, prevents their widespread use, such as for under-the-hood applications in automotive industry. In this presentation, we will describe the current research at PNNL to develop thermally stable nanocrystalline Mg alloys that take advantage of the thermodynamic stability afforded by solute segregation to the grain boundaries and thus, are likely to retain their ambient temperature strength at elevated temperatures as well. High-purity nanocrystalline thin films of pure Mg and Mg-Zn alloys were fabricated using magnetron sputtering and subsequently annealed at elevated temperature to evaluate their respective thermal stability. Grain size, microstructure and solute distribution in the films was analyzed using TEM and atom probe tomography to uncover the effect of alloy content on the grain growth, second phase formation, and thermal stability.
||Planned: Supplemental Proceedings volume