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

Yue Ren ¹Qing Zhou ²Dongpeng Hua ¹Zhuobin Huang ¹Yulong Li ³Qian Jia ¹Peter Gumbsch ⁴Christian Greiner ³Haifeng Wang ¹Weimin Liu⁵

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作者信息

1. State Key Laboratory of Solidification Processing,Center of Advanced Lubrication and Seal Materials,Northwestern Polytechnical University,Xi'an 710072,China
2. 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
3. Institute for Applied Materials,Karlsruhe Institute of Technology,Karlsruhe 76131,Germany;IAM-ZM MicroTribology Center μTC,Karlsruhe Institute of Technology,Karlsruhe 76131,Germany
4. Institute for Applied Materials,Karlsruhe Institute of Technology,Karlsruhe 76131,Germany;Fraunhofer IWM,Freiburg 79108,Germany
5. State Key Laboratory of Solidification Processing,Center of Advanced Lubrication and Seal Materials,Northwestern Polytechnical University,Xi'an 710072,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China
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Abstract

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.

Key words

Multi-principal element alloy/Cryogenic temperature/Wear/CoCrNi

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基金项目

National Natural Science Foundation of China(52175188)

National Natural Science Foundation of China(51975474)

National Key R&D Program of China(2022YFB3705300)

Key Research and Development Program of Shaanxi Province(2023-YBGY-434)

Fundamental Research Funds for the Central Universities(3102019JC001)

Open Fund of Liaoning Provincial Key Laboratory of Aeroengine Materials Tribology(LKLAMTF202301)

German Research Foundation(DFG)under Project G.R.4174/5 and by the European Research Council(ERC)(771237)

出版年

2024

科学通报(英文版)

中国科学院

科学通报(英文版)

CSTPCD

ISSN：1001-6538

参考文献量1

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