摘要
采用激光熔覆技术制备了FeCoCrNiMn_(x)(x=0,0.25,0.50)的高熵合金涂层,系统地研究了添加不同摩尔比的Mn对涂层的显微组织、硬度以及摩擦学性能的影响.采用分子动力学模拟的方法研究了FeCoCrNiMn高熵合金涂层的原子尺度变形和磨损行为.FeCoCrNiMn_(x)高熵合金涂层由单一的面心立方晶格(FCC)型固溶体组成.结果表明,Mn的掺杂提高了涂层的减摩性和耐磨性,摩擦系数为0.66的Mn_(0.5)涂层在各涂层中具有最优的减摩擦性能.与基材Q235钢[磨损率为12.2×10^(-5)mm^(3)/(N·m)]和FeCoCrNi涂层[磨损率为4.99×10^(-5)mm^(3)/(N·m)]相比,Mn_(0.5)涂层[磨损率为4.03×10^(-5)mm^(3)/(N·m)]的耐磨性分别提高了66.96%和19.23%.分子动力学模拟结果表明,Mn掺杂通过摩擦诱导的FCC变到HCP(密排六方),掺杂Mn可增强应变硬化.根据位错演化模式确定,Mn_(0.5)涂层的变形机理是相变诱发塑性(TRIP),从而同时提高了涂层的塑性、强度和加工硬化率.
Advanced Metal Materials,Ministry of Education,Anhui University of Technology;In this study,three mixed powder systems comprising of FeCoCrNiMn_0,FeCoCrNiMn_(0.25)and FeCoCrNiMn_(0.5)were prepared by adding varying amounts of Mn into the classic high-entropy alloy system of FeCoCrNi.Subsequently,the three high-entropy alloy coatings were laser-clad onto Q235 steel.The micro-structure and evolution of the coating were thoroughly analyzed using X-ray diffraction,scanning electron microscope,energydispersion spectroscopy and other testing and analysis techniques.This paper focused on the tribological properties of the coated surface in terms of performance.The high-temperature friction and wear tester was used to perform ball-disk wear tests at room temperature to examine its anti-friction and wear-resistant qualities.The friction and wear process of FeCoCrNiMn_(0.5)coating was simulated through the use of molecular dynamics simulation software and the results were then compared with test results.Furthermore,the wear process and behavior mechanism of the surface coating was further investigated by characterizing the work hardening and morphology of the damaged surface.The micro-structure and micro-structure evolution of the coating were analyzed in detail by means of XRD,SEM,EDS and other analysis and testing methods.In terms of performance,this paper mainly aimed at the tribological properties of the coating surface,and used the high-temperature friction and wear tester to conduct ball-disk wear tests at room temperature to characterize its anti-friction and wear resistance.The friction and wear process of FeCoCrNiMn_(0.5)coating at room temperature was simulated by molecular dynamics simulation software,and the simulation results were compared with the test results.Furthermore,the wear process and behavior mechanism of the coating surface were further studied by characterizing the work hardening and surface damage morphology of the worn surface.The results showed that the FeCoCrNiMnx high entropy alloy system achi
作者
王志文
刘秀波
杨超敏
周海滨
张世宏
WANG Zhiwen;LIU Xiubo;YANG Chaomin;ZHOU Haibin;ZHANG Shihong(Hunan Province Key Laboratory of Materials Surface/Interface Science&Technology,School of Materials Science&Engineering,Central South University of Forestry&Technology,Hunan Changsha 410004,China;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Anhui University of Technology,Anhui Maanshan 243002,China)
出处
《摩擦学学报（中英文）》
EI
CAS
CSCD
北大核心
2024年第7期960-972,共13页
Tribology
基金
国家自然科学基金项目(52075559,52205243)
湖南省重点研发计划项目(2022GK2030)
湖南省自然科学基金项目(2023JJ057)
先进金属材料绿色制备与表面技术教育部重点实验室开放基金(GFST2023KF01)资助。
关键词
摩擦学特性
高熵合金
激光熔覆
MN元素
分子动力学模拟
tribological property
high entropy alloy
laser cladding
Mn elements
molecular dynamics simulation
