|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||J-46: Interdiffusion, Solubility Limit and Role of Enthalpy and Entropy in Senary FCC Al-Co-Cr-Fe-Ni-Mn High Entropy Alloy
||Abhishek Mehta, Yongho Sohn
|On-Site Speaker (Planned)
High entropy and sluggish diffusion “core” effects were investigated in FCC Al-Co-Cr-Fe-Ni-Mn alloy by examining the off-equiatomic compositions, generated by the concentration profiles within solid-to-solid diffusion couples between β-Al48Ni52 and Co20Cr20Fe20Ni20Mn20 alloys in temperature range from 900 to 1200°C. Phase constituents, microstructure and concentration profiles were examined by X-ray diffraction and scanning electron microscopy. The magnitude of average effective interdiffusion coefficients of individual components in Al-Co-Cr-Fe-Ni-Mn alloys were compared to the interdiffusion coefficients in relevant ternary, quaternary, and quinary alloys. Solubility limit of Al in off-equiatomic Al-Co-Cr-Fe-Ni-Mn alloys was compared to the solubility limit of Al in equiatomic AlxCoCrFeNiMn determined using calculated equilibrium pseudo-binary phase diagram. Formation of single-phase in Al-Co-Cr-Fe-Ni-Mn senary HEAs was limited by the solubility limit of Al rather than absolute magnitude of configurational entropy. Findings from this study are discussed in terms of thermodynamic and kinetic contributions towards the stability of HEAs.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume