|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||High Entropy Alloys V
||L-96: An Assessment of the Lattice Strain in the CrMnFeCoNi High-Entropy Alloy
||Lewis Owen, Ed J Pickering, Helen Y Playford, Howard J Stone, Matthew G Tucker, Nicholas G Jones
|On-Site Speaker (Planned)
The formation of single-phase solid solutions from equiatomic combinations of multiple elements, with differing atomic radii, has led to the suggestion that the lattices of high-entropy alloys (HEAs) must be severely distorted. Whilst a lattice of this type might be considered thermodynamically unstable, it is argued that the high configurational entropy of these systems is sufficient to allow such distortions to exist. Significant solid solution strengthening is believed to be derived from these strained lattices, but experimental studies have yet to verify these hypotheses. In this study, neutron total scattering and pair distribution function (PDF) analysis have been used to assess the level of local lattice strains in the exemplar HEA CrMnFeCoNi. The results are compared with similar data from five compositionally simpler materials within the same system to determine whether the HEA lattice can be considered to contain anomalously high levels of local distortion.
||Planned: Supplemental Proceedings volume