Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation  

作　　者：Yushan Geng Wenyuan Chen Hui Tan Jun Cheng Shengyu Zhu Jun Yang Weimin Liu 

机构地区：[1]State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,PR China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,PR China [3]Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing,Yantai 264000,PR China

出　　处：《Research》2024年第1期403-416,共14页研究（英文）

基　　金：the National Natural Science Foundation of China(52175197 and 51975557);the Outstanding Youth Fund of Gansu Province(20JR5RA571);the Youth Innovation Promotion Association CAS(2022425).

摘　　要：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) mm^(3)/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.

关 键 词：WEAR ALLOYS FRICTION 

分 类 号：TB383[一般工业技术—材料科学与工程]