|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||J-99: Imaging Short Range Order in The CrCoNi Medium Entropy Alloy
||Ruopeng Zhang, Shiteng Zhao, Jun Ding, Yan Chong, Qin Yu, Colin Ophus, Mark Asta, Robert O. Ritchie, Andrew Minor
|On-Site Speaker (Planned)
The equiatomic CoCrNi medium entropy alloy (MEA) exhibits exceptional high strength and ductility. The alloy is regarded as a random solid solution, yet the properties cannot be fully explained by solution hardening. Chemical short-range order could significantly affect the mechanical behaviors of alloys. While associated phenomena have been indirectly related to the deformation behaviors of MEA, direct observation of SRO by electron microscopy is challenging due to their intrinsically small scale and the diffuse nature of the structure. Here we report the verification of SRO in a thermal-mechanically treated MEA via high resolution (HRTEM) and energy-filtered TEM dark-field imaging (DF). By excluding the inelastically scattered electrons, superlattice-like diffraction pattern features from the SRO clusters could be detected. The size extent as well as the spatial distribution of the SRO clusters are directly resolved by DF imaging, which has been correlated to the effects on the mechanical behaviors of the MEA.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume