|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||High Entropy Alloys IV
||Electronic Effects in High-Entropy Alloys
||Takeshi Egami, Odbadrakh Khorgolkhuu, George Malcolm Stocks
|On-Site Speaker (Planned)
High-entropy alloys (HEA) are stabilized by their high configurational entropy. But their mechanical properties are influenced largely by the atomic-level stresses and strains. The atomic-level stresses in the HEA are caused by mismatch in size and electronic structure among the constituent elements. Through the ab-initio calculations of the electronic structure using the density functional theory we show that charge transfer among the constituent elements creates considerable internal pressure even though the nominal atomic size differences are small. In the case of the Cr-Fe-Co-Ni alloy, Cr is under tension whereas Ni is under compression, and Co and Fe have small pressures. These atomic-level pressures cause local lattice distortions which can hinder the movement of dislocations, and could cause massive solution hardening. They also make amorphization easier, and contribute to the irradiation resistance of the HEA.
||Planned: A print-only volume