首页|Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation
Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation
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Sustained wear damages on the sliding surfaces of alloys are generally the culprit responsible for the failure of various mechanical systems.Inspired by high-entropy effects,here we deliberately deploy nanohierarchical architecture with composition undulation in a Ni50(AlNbTiV)50 complex concentrated alloy,which yields ultralow wear rate within the order of 10-7 to 10-6 mm3/Nm between room temperature and 800 ℃.Such remarkable wear resistance heretofore represents one of the highest wear resistance reported for the bulk alloys or composites,and originates from the multi-type adaptive friction interface protection governed by intrinsically nano-coupled grains and nanoprecipitates.This cooperative heterostructure releases gradient frictional stress in stages upon wear at room temperature through the coexistence of multiple deformation pathways while activating a dense nanocrystalline glaze layer upon wear at 800 ℃ to minimize adhesive and oxidative wear.Our work uncovers a practical avenue for tailoring wear properties with multicomponent heterostructures over a wide temperature range.
Yushan Geng、Wenyuan Chen、Hui Tan、Jun Cheng、Shengyu Zhu、Jun Yang、Weimin Liu
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State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,PR China
Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,PR China
Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing,Yantai 264000,PR China
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