|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||High Entropy Alloys V
||Structural and Thermodynamic Properties of a Lightweight AlTiVCr High Entropy Alloy
||Yong-Jie Hu, Yong-Jie Qiu, N Birbilis, Zi-Kui Liu
|On-Site Speaker (Planned)
A light-weight AlTiVCr high entropy alloy (HEA) has been investigated experimentally and computationally recently. First-principles calculations, coupled with the quasi harmonic approach based on the Debye-Grüneisen model, are employed to predict the enthalpy, entropy and Gibbs energy of formation of a fully disordered BCC structure as a function of temperature in comparison with those of an ordered B2 structure with atomic mixing in sublattice sites. It is found that the B2 structure has a more negative Gibbs energy of formation up to 900 K, indicating that the AlTiVCr HEA has a B2 structure with atomic mixing in sublattice sites at low temperatures. The predication is validated by the experimental characterization of the selected area diffraction patterns. In addition, the lattice parameter, thermal expansion coefficient, and elastic moduli of the AlTiVCr HEA are also predicted as a function of temperature.
||Planned: Supplemental Proceedings volume