About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
High Entropy Alloys VIII
|
Presentation Title |
J-70: Ultrastrong VCoNi Medium-entropy Alloy Enabled by Severe Lattice Distortion |
Author(s) |
Seok Su Sohn, Alisson Kwiatkowski da Silva, Yuji Ikeda, Fritz Körmann, Wenjun Lu, Won Seok Choi, Baptiste Gault, Dirk Ponge, Jörg Neugebauer, Dierk Raabe |
On-Site Speaker (Planned) |
Seok Su Sohn |
Abstract Scope |
Severe lattice distortion is a core effect in the design of multiprincipal element alloys with the aim to enhance yield strength. Yet, the yield strength values of those alloys investigated so far do not substantially exceed those of conventional alloys due to the insufficient utilization of lattice distortion. In this study, for a VCoNi equiatomic solid solution alloy, it is demonstrated that a wide fluctuation of the atomic bond distances, i.e., severe lattice distortion, improves both yield stress and its sensitivity to grain size. The refined grain size of 1 um in an average leads to the yield strength of 1.3 GPa. we present that the degree of lattice distortion is indeed a key parameter in controlling strengthening mechanisms for the design of hitherto unexplored ultrastrong medium-entropy single-phase alloys. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |