About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Symposium
|
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
Disorder-driven Biasing of Deformation Tendencies in Concentrated FCC Solid Solutions |
Author(s) |
Matthew Daly, Ritesh Jagatramka |
On-Site Speaker (Planned) |
Matthew Daly |
Abstract Scope |
The intrinsic competition between deformation mechanisms can be conveniently conceptualized by the fault energy landscape. In pure systems or dilute solutions, where a primary element occupies most atomic positions, the fault energy landscape can be considered as spatially homogenous. However, in concentrated solid solutions such as high entropy alloys, local fluctuations in the atomic distribution disrupt the periodicity of the fault energy landscape. These perturbations introduce new paths of least resistance within a topology, which give rise to localized tendencies for differing deformation behaviors. Here, we will discuss how randomized atomic distributions bias the operation of deformation mechanisms in concentrated FCC solid solutions. Our approach combines atomistic calculations with kinetic Monte Carlo-based models to connect the atomic-scale fluctuations in composition with changes in deformation tendencies. A physical model that incorporates stochastic effects into the description of deformation energy barriers will also be discussed. |
Proceedings Inclusion? |
Undecided |