About this Abstract |
Meeting |
2017 TMS Annual Meeting & Exhibition
|
Symposium
|
High Entropy Alloys V
|
Presentation Title |
Atomistic Simulations in a Model FCC High Entropy Alloy: Effects of Annealing |
Author(s) |
Edwin A Antillon, Christopher Woodward, Satish Rao, Ahmed Hussein, Triplicane Parthasarathy |
On-Site Speaker (Planned) |
Edwin A Antillon |
Abstract Scope |
High-entropy alloys (HEA) represent a new class of materials with interesting strength and high-temperature properties. Yield stress of a model FCC multicomponent material (Co30-Fe16.67-Ni36.67-Ti16.67) is investigated using pairwise (EAM) potentials. Previous work has shown that a random chemical distribution gives rise to large variations in the dislocation core structure and local pinning due to variations in composition. We extend this work by applying a hybrid Molecular-dynamics/Monte-Carlo simulation to mimic alloy annealing at various temperatures. Even at large annealing temperatures significant compositional short-range order (CSRO) emerges which can regularize the large variability of the stacking fault energies seen in the purely random configurations. We explore the distribution of hard and soft regions along the dislocation line due to concentration fluctuations and ordering in order to inform development of high-concentration solid-solution models. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |