|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Microstructure Evolution, Phase Stability and Mechanical Behavior of Ultra-fine Grained AlFeNiCuCoCr High Entropy Alloy Processed by Severe Plastic Deformation
||Baolong Zheng, Zhiqiang Fu, Lilia Kurmanaeva, Yaojun Lin, Julia Ivanisenko, Yizhang Zhou, Fei Chen, Horst Hahn, Lianmeng Zhang, Enrique J. Lavernia
|On-Site Speaker (Planned)
||Enrique J. Lavernia
High entropy alloys (HEAs) are multi-principal-element alloys with near-equiatomic or equiatomic compositions that benefit from a high configurational entropy. In this work, we studied the microstructure evolution, phase stability and mechanical behavior of an ultra-fine grained (UFG) AlFeNiCuCoCr HEA processed by severe plastic deformation (SPD) techniques, cryogenic mechanical milling (cryomilling) and high pressure torsion (HPT). SEM, TEM/HRTEM, XRD techniques and thermal analysis in the processed HEAs samples were conducted. Microstructural studies revealed nano-scale deformation structures including dislocation tangles, deformation bands and twinning in HPTed HEAs. The effects of processing on grain size and phase evolution were investigated in detail. The influence of grain refinement on the reported unique phenomena associated with HEAs, such as sluggish diffusion and high strength at elevated temperatures, was discussed to provide insight into fundamental phenomena and microstructural evolution including thermodynamic variables, grain and lattice structure, and thermal stability in HEAs processed using SPD methods.