A wear-resistant metastable CoCrNiCu high-entropy alloy with modulated surface and subsurface structures  

作　　者：Yue REN Qian JIA Yin DU Qing ZHOU Christian GREINER Ke HUA Haifeng WANG Jian WANG 

机构地区：[1]State Key Laboratory of Solidification Processing,Center of Advanced Lubrication and Seal Materials,Northwestern Polytechnical University,Xi’an 710072,China [2]Institute for Applied Materials,Karlsruhe Institute of Technology,Karlsruhe 76131,Germany [3]Mechanical and Materials Engineering,University of Nebraska-Lincoln,Nebraska 68588,USA

出　　处：《Friction》2022年第10期1722-1738,共17页摩擦（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(No.51801161);the Fundamental Research Funds for the Central Universities(No.3102019JC001).

摘　　要：Sliding friction-induced subsurface structures and severe surface oxidation can be the major causes influencing the wear resistance of ductile metallic materials.Here,we demonstrated the role of subsurface and surface structures in enhancing the wear resistance of an equiatomic metastable CoCrNiCu high-entropy alloy(HEA).The CoCrNiCu HEA is composed of a CoCrNi-rich face-centered cubic(FCC)dendrite phase and a Cu-rich FCC inter-dendrite phase.Copious Cu-rich nano-precipitates are formed and distributed uniformly inside the dendrites after tuning the distribution and composition of the two phases by thermal annealing.Although the formation of nano-precipitates decreases the hardness of the alloy due to the loss of solid solution strengthening,these nano-precipitates can be deformed to form continuous Cu-rich nanolayers during dry sliding,leading to a self-organized nano-laminated microstructure and extensive hardening in the subsurface.In addition,the nano-precipitates can facilitate the formation of continuous and compacted glaze layers on the worn surface,which are also beneficial for the reduction of the wear rate of CoCrNiCu.The current work can be extended to other alloy systems and might provide guidelines for designing and fabricating wear-resistant alloys in general.

关 键 词：high-entropy alloys(HEA) WEAR nano-laminated structure oxidation atomic force microscope(AFM) 

分 类 号：TG139[一般工业技术—材料科学与工程]