|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||Investigation of Phase Behavior in Al-Cr-Co-Ni-Ti Multi-principal Element Alloys Using the CALPHAD Approach with Key Experiments
||Wei Xiong, Yunhao Zhao
|On-Site Speaker (Planned)
Multi-principal element alloys significantly expand the number of new alloy candidates. Therefore, a careful study of phase transformations based on the CALPHAD (Calculation of Phase Diagrams) method during new alloy development is important. In this work, several Al-Cr-Co-Ni-Ti multi-principal element alloys are prepared using arc-melting followed by isothermal heat treatment. Considerable amount of ordered BCC_B2 structure are observed in the BCC solution phase. Microstructural analysis indicates a notable deviation from equilibrium calculations at the heat treatment temperatures. However, reasonably good agreements exist between nonequilibrium thermodynamic simulation and experimental observation on as-cast states. The designed experiments indicate a slow diffusion within the system. Comparison between experiments and model-prediction shows the strength of the CALPHAD-type thermodynamic modeling in high entropy alloy design. In addition, high-quality thermodynamic databases are desired to explore the compositional space for new alloy development.
||Planned: Supplemental Proceedings volume