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

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

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Traditional high strength engineering alloys suffer from serious surface brittleness and inferior wear per-formance 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 dif-ferent 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 mas-sive 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 mate-rial.These features make the CoCrNi alloy particularly wear resistant at cryogenic conditions and an excellent candidate for safety-critical applications.

Multi-principal element alloyCryogenic temperatureWearCoCrNi

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

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State Key Laboratory of Solidification Processing,Center of Advanced Lubrication and Seal Materials,Northwestern Polytechnical University,Xi'an 710072,China

Institute for Applied Materials,Karlsruhe Institute of Technology,Karlsruhe 76131,Germany

IAM-ZM MicroTribology Center μTC,Karlsruhe Institute of Technology,Karlsruhe 76131,Germany

Fraunhofer IWM,Freiburg 79108,Germany

State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key R&D Program of ChinaKey Research and Development Program of Shaanxi ProvinceFundamental Research Funds for the Central UniversitiesOpen Fund of Liaoning Provincial Key Laboratory of Aeroengine Materials TribologyGerman Research Foundation(DFG)under Project G.R.4174/5 and by the European Research Council(ERC)

52175188519754742022YFB37053002023-YBGY-4343102019JC001LKLAMTF202301771237

2024

10.1016/j.scib.2023.12.003

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(2)
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