Wear-resistant CoCrNi multi-principal element alloy at cryogenic temperature  

作　　者：Yue Ren Qing Zhou Dongpeng Hua Zhuobin Huang Yulong Li Qian Jia Peter Gumbsch Christian Greiner Haifeng Wang Weimin Liu 

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]IAM-ZM MicroTribology CenterμTC,Karlsruhe Institute of Technology,Karlsruhe 76131,Germany [4]Fraunhofer IWM,Freiburg 79108,Germany [5]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China

出　　处：《Science Bulletin》2024年第2期227-236,共10页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(52175188 and 51975474);National Key R&D Program of China(2022YFB3705300);Key Research and Development Program of Shaanxi Province(2023-YBGY-434);the Fundamental Research Funds for the Central Universities(3102019JC001);Open Fund of Liaoning Provincial Key Laboratory of Aero-engine Materials Tribology(LKLAMTF202301);C.G.acknowledges funding by the German Research Foundation(DFG)under Project G.R.4174/5 and by the European Research Council(ERC)under Grant No.771237.

摘　　要：Traditional high strength engineering alloys suffer from serious surface brittleness and inferior wear performance when servicing under sliding contact at cryogenic temperature.Here,we report that the recently emerging CoCrNi multi-principal element alloy defies this trend and presents dramatically enhanced wear resistance when temperature decreases from 273 to 153 K,surpassing those of cryogenic austenitic steels.The temperature-dependent structure characteristics and deformation mechanisms influencing the cryogenic wear resistance of CoCrNi are clarified through microscopic observation and atomistic simulation.It is found that sliding-induced subsurface structures show distinct scenarios at different deformation temperatures.At cryogenic condition,significant grain refinement and a deep plastic zone give rise to an extended microstructural gradient below the surface,which can accommodate massive sliding deformation,in direct contrast to the strain localization and delamination at 273 K.Meanwhile,the temperature-dependent cryogenic deformation mechanisms(stacking fault networks and phase transformation)also provide additional strengthening and toughening of the subsurface material.These features make the CoCrNi alloy particularly wear resistant at cryogenic conditions and an excellent candidate for safety–critical applications.

关 键 词：Multi-principal element alloy Cryogenic temperature WEAR CoCrNi 

分 类 号：TG132[一般工业技术—材料科学与工程]