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  4. Wear-resistant CoCrNi multi-principal element alloy at cryogenic temperature
 
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2024
Journal Article
Title

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

Abstract
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.
Author(s)
Ren, Yue
Northwestern Polytechnical University, State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials
Zhou, Qing
Northwestern Polytechnical University, State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials
Hua, Dongpeng
Northwestern Polytechnical University, State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials
Huang, Zhuobin
Northwestern Polytechnical University, State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials
Yulong, Li
Karlsruhe Institute of Technology -KIT-, Institute for Applied Materials
Qian, Jia
Northwestern Polytechnical University, State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials
Gumbsch, Peter  
Karlsruhe Institute of Technology -KIT-, Institute for Applied Materials
Greiner, Christian
Karlsruhe Institute of Technology -KIT-, Institute for Applied Materials
Wang, Haifeng
Northwestern Polytechnical University, State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials
Liu, Weimin
Northwestern Polytechnical University, State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials
Journal
Science bulletin  
DOI
10.1016/j.scib.2023.12.003
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • Multi-principal element alloy

  • Cryogenic temperature

  • Wear

  • CoCrNi

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