摘要
采用微弧氧化(MAO)在A356铝合金表面制备MAO膜,利用球-平面接触在SRV-V微动摩擦磨损机上探究变载荷和位移下微弧氧化对A356铝合金微动磨损机制的影响。结果表明:MAO膜由疏松层和致密层构成,其均匀性、致密性和结合力良好。MAO膜的摩擦系数、磨损率均低于A356铝合金,MAO膜减摩耐磨性较好。随位移增加MAO膜的摩擦耗散能系数低于A356铝合金,MAO膜能提升A356铝合金微动磨损过程的稳定性。载荷增加时A356铝合金磨损机制为磨粒磨损-粘着磨损,伴随犁削和疲劳剥层;MAO膜磨损机制为磨粒磨损-粘着磨损和疲劳剥落。位移增加时A356铝合金磨损机制为粘着磨损和疲劳剥落,伴随微犁削;MAO膜磨损机制为粘着磨损和疲劳剥层-粘着磨损和磨粒磨损。A356铝合金的磨痕内聚集Fe、O元素,存在材料转移和氧化磨损;MAO膜磨痕内聚集Fe元素,存在材料转移。
The micro-arc oxidation ceramic film with wear resistance was prepared on the surface of A356 aluminum alloy using micro-arc oxidation technology(MAO).The investigation of the effect of micro-arc oxidation on the fretting wear mechanism of A356 aluminum alloy was explored on an SRV-V fretting friction and wear testing machine using sphere-plane point contact under variable normal loads and displacement amplitudes.The results show that the MAO film consists of a porous outer layer and a dense inner layer with good homogeneity,denseness and bonding strength.The friction coefficient and wear rate of MAO film are lower than those of A356 alloy when the normal load and displacement amplitude increases.It indicates that the MAO film has good friction reduction and wear resistance.The frictional dissipation energy coefficient of MAO film is lower than that of A356 alloy when the displacement amplitude increases,which can enhance the wear stability of fretting wear process of A356 aluminum alloy.The wear mechanism of A356 alloy changes from abrasive wear to adhesive wear when the normal load increases,accompanied by ploughing and fatigue peeling.The wear mechanism of MAO film changes from abrasive wear to adhesive wear and fatigue peeling when the normal load increases.The wear mechanism of A356 alloy changes from adhesive wear and fatigue peeling to adhesive wear and abrasive wear when displacement amplitude increases.The wear mechanism of MAO film changes from adhesive wear and fatigue peeling to adhesive wear and abrasive wear when displacement amplitude increases.The accumulated Fe and O elements are gathered within the A356 aluminum alloy wear scars,which indicates that there is material transfer and oxidation wear during the fretting wear process of GCr15/A356 frictional counterpart.The Fe elements are gathered within the MAO film wear scars,which indicates that there is material transfer of GCr15/MAO film frictional counterpart.
作者
孙璐
李元东
马颖
曹驰
罗晓梅
邱谨
SUN Lu;LI Yuan-dong;MA Ying;CAO Chi;Luo Xiao-mei;QIU Jin(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Wenzhou Pump and Valve Engineering Research Institute,Lanzhou University of Technology,Wenzhou 325000,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2024年第3期796-806,共11页
Rare Metal Materials and Engineering
基金
甘肃省重点研发计划(20YF8GA058)
温州市工业科技项目(ZG20211003)。
关键词
A356铝合金
微弧氧化
微动磨损
磨损机制
耐磨性
A356 aluminum alloy
micro-arc oxidation
fretting wear
wear mechanism
wear resistance
