Rapid precipitation of L1 <sub>2</sub> phase in Al <sub>0.5</sub> CoCrFeNi high-entropy alloy under electropulsing
Zhicheng Wu, Xiaofeng Xu, Lai Wei, Yongqiang Yu, Xingguo Fu, Ganghu Cheng, Hai-Long Jia, Yue Jiang
Abstract
A new strategy for the rapid precipitation (1.8 s) of L12 nanoprecipitates in Al0.5CoCrFeNi high-entropy alloys by electropulsing treatment (EPT) has recently been discovered. The coherent L12 phase was introduced under high temperatures by EPT, and this result broke the previous understanding that it needs to be aged for a long time at low temperatures. The formation of the L12 precipitates was mainly attributed to the combination of thermal and athermal effects during EPT. This work provides insights into the rapid regulation of multiphase (FCC + B2 + L12) and dislocation combinations in high-entropy alloys to optimize strength and ductility.