Effects of nanostructuring on mechanical and tribological behaviors of FeCoNi medium-entropy alloy  

结构纳米化对FeCoNi中熵合金力学行为及摩擦磨损性能的影响

作　　者：Yan CHEN Heng LI Si-en LI Gui-xun SUN Liang ZHAO Chao-quan HU Wei ZHANG Guo-dong TONG Xue-gang CHEN Shuang HAN Hong-xiang ZONG Jun LI Jian-she LIAN 陈岩;李恒;李斯恩;孙贵训;赵亮;胡超权;张炜;佟国栋;陈学罡;韩双;宗洪祥;李军;连建设(吉林大学材料科学与工程学院汽车材料教育部重点实验室,长春130025;西安交通大学金属材料强度国家重点实验室,西安710049;吉林大学超硬材料国家重点实验室,长春130025;中国第一汽车股份有限公司,长春130011)

机构地区：[1]Key Laboratory of Automobile Materials,Ministry of Education,College of Materials Science and Engineering,Jilin University,Changchun 130025,China [2]State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China [3]State Key Laboratory of Superhard Materials,Jilin University,Changchun 130025,China [4]China FAW Corporation Limited,Changchun 130011,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第12期3963-3977,共15页中国有色金属学报（英文版）

基　　金：supported by the Science and Technology Development Program of Jilin Province,China(No.20160520007JH);the Major Science and Technology Special Project in Jilin Province,China(No.20210301024GX);the National Natural Science Foundation of China(Nos.51601067,51775266,52301169).

摘　　要：The effects of nanostructuring on the mechanical and dry-sliding wear behaviors of a FeCoNi medium-entropy alloy(MEA)were systematically investigated through nano-indentation and ball-on-disc wear tests.The results show that reducing the grain size down into the nano-meter regime,on the one hand,significantly elevates the hardness of the FeCoNi alloy,and on the other hand,facilitates the formation of a surface oxide layer.As a result,the wear rate of the nanocrystalline(NC)FeCoNi alloy is one order of magnitude lower than its coarse-grained counterpart.The NC FeCoNi alloy also exhibits obviously enhanced wear resistance compared with conventional NC Ni and Ni-based alloys in terms of both lower wear rate and friction coefficient.Such enhancement in tribological properties mainly stems from the improved strain hardening ability,owing to the inevitable concentration heterogeneity in MEA that imposes extra resistance to dislocation motion.通过纳米压痕测试和球盘摩擦实验,系统研究结构纳米化对FeCoNi中熵合金力学行为及干滑动摩擦磨损性能的影响。结果表明,将晶粒尺寸减小至纳米尺度,一方面显著提高了合金的硬度,另一方面促进了表面氧化层的形成。二者的共同作用使纳米晶FeCoNi合金的磨损率比粗晶合金低了一个数量级。与传统的纳米晶Ni及Ni基合金相比,纳米晶FeCoNi合金具有显著降低的磨损率和摩擦系数,表现出优异的耐磨性。这主要是由于纳米晶FeCoNi合金中本征的微尺度成分起伏能够有效阻碍位错滑移,使合金的应变硬化能力显著提高所致。

关 键 词：medium-entropy alloy FeCoNi alloy nanocrystalline mechanical behavior dry-sliding wear concentration undulation 

分 类 号：TG139[一般工业技术—材料科学与工程]