About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials Design Approaches and Experiences V
|
Presentation Title |
Materials Parameters in Designing FCC High-entropy Alloys |
Author(s) |
Haruyuki Inui, Koudai Niitsu, Kyosuke Kishida, Easo P. George |
On-Site Speaker (Planned) |
Haruyuki Inui |
Abstract Scope |
High-entropy alloys (HEAs) comprise a novel class of scientifically and technologically interesting materials. Among these, equatomic CrMnFeCoNi and its derivative quaternary and ternary alloys with the FCC structure are noteworthy because their strengths are by far higher than those of conventional FCC alloys and their tensile ductility increases with decreasing temperature while maintaining outstanding fracture toughness. It is indispensable to find out proper materials parameters that predict the strength and ductility in designing HEAs with high strength/ductility. Since the high ductility at low temperatures is reported to arise from the occurrence of deformation twinning, stacking fault energy must in principle be responsible, while the strength seems to be correlated with the mean-square atomic displacement (MSAD) from the regular FCC lattice points. MSAD and stacking fault energy are discussed in terms of how and to what extent whey can be used to predict the strength and ductility of HEAs. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |