摘要
采用搅拌摩擦加工工艺制备CoCrFeNi高熵合金颗粒增强AZ31镁基复合材料。采用OM、SEM、EDS和EBSD对复合材料的微观结构进行表征。通过拉伸、显微硬度和干滑动磨损实验研究复合材料的力学性能和磨损性能。结果表明,高熵合金颗粒分布均匀,与镁基体具有良好的冶金结合。复合材料的屈服强度、抗拉强度和硬度分别比母材高80 MPa、46 MPa和HV 54.9。细晶强化是主要的强化机制,对屈服强度的贡献率为43.9%。复合材料的平均摩擦因数由母材的0.331降低到0.240,磨损机制由母材的黏着磨损转变为磨粒磨损。
AZ31 magnesium(Mg)alloy composites reinforced with CoCrFeNi high-entropy alloy(HEA)particles were fabricated by friction stir processing(FSP).OM,SEM,EDS,and EBSD were used to characterize the microstructure of composites.Mechanical and wear properties of the composites were investigated by tensile,microhardness,and dry sliding wear tests.The results revealed that HEA particles were homogeneously distributed and exhibited good metallurgical bonding with Mg matrix.The yield strength,ultimate tensile strength,and microhardness of the composites were 80 MPa,46 MPa,and HV 54.9 higher than those of the base metal(BM),respectively.Fine-grained strengthening was the main strengthening mechanism whose contribution rate on the yield strength was 43.9%.The average friction coefficient of the composites was decreased from 0.331 of BM to 0.240,and the wear mechanism was changed from adhesive wear of BM to abrasive wear.
作者
王文
方园
彭湃
张志娟
韩鹏
张婷
刘志浩
关肖虎
王智
乔柯
王快社
Wen WANG;Yuan FANG;Pai PENG;Zhi-juan ZHANG;Peng HAN;Ting ZHANG;Zhi-hao LIU;Xiao-hu GUAN;Zhi WANG;Ke QIAO;Kuai-she WANG(National and Local Joint Engineering Research Center for Functional Materials Processing,Xi’an University of Architecture and Technology,Xi’an 710055,China)
基金
the National Natural Science Foundation of China(Nos.U1760201,52034005,51974220)
the Key Research and Development Program of Shaanxi Province,China(Nos.2020ZDLGY13-06,2017ZDXM-GY-037)
the Innovation Capacity Support Project of Shaanxi Province-Nova Program,China(No.2020KJXX-077)
the Science Fund for Distinguished Young Scholars in Universities of Shaanxi Province,China。
关键词
搅拌摩擦加工
高熵合金颗粒
镁基复合材料
界面层
拉伸性能
磨损性能
friction stir processing
high-entropy alloy particles
magnesium matrix composite
interface layer
tensile properties
wear properties
