水下搅拌摩擦加工制备CoCrFeNiMn/6061Al复合材料组织和性能研究  

Study on microstructure and properties of CoCrFeNiMn/6061Al composites prepared by underwater friction stir processing

作　　者：王智 王文[1,2] 张志娟 韩鹏[1,2] 方园 张婷 王快社[1,2] WANG Zhi;WANG Wen;ZHANG Zhi-juan;HAN Peng;FANG Yuan;ZHANG Ting;WANG Kuai-she(School of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China;National and Local Join Engineering Research Center for Functional Materials Processing,Xi′an University of Architecture and Technology,Xi′an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]西安建筑科技大学功能材料加工国家地方联合工程研究中心,陕西西安710055

出　　处：《塑性工程学报》2023年第2期223-230,共8页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51974220);国家重点研发计划(2021YFB3700902);陕西省杰出青年科学基金资助项目(2022JC-24)。

摘　　要：采用水下搅拌摩擦加工制备CoCrFeNiMn高熵合金颗粒增强6061-T6基复合材料,研究了时效热处理对CoCrFeNiMn/6061Al复合材料微观组织、显微硬度和磨损性能的影响。采用扫描电镜和电子背散射衍射技术对复合材料的微观组织进行了表征,采用显微硬度和磨损实验对复合材料的性能进行了评价。结果表明,经5道次搅拌摩擦加工后,CoCrFeNiMn高熵合金颗粒均匀分布在Al基体中,且与基体界面结合良好,无明显扩散层。时效热处理后,CoCrFeNiMn高熵合金颗粒与基体界面出现厚度约为200 nm的扩散层,复合材料的平均显微硬度达到120.0 HV,比Al基体提高了27.7%。与Al基体相比,复合材料的平均摩擦因数从0.4491升高至0.4855。时效热处理后,复合材料的平均摩擦因数降低至0.3188,主要磨损机制为磨粒磨损。CoCrFeNiMn high-entropy alloy(HEA)particle reinforced 6061-T6 matrix composites were prepared by underwater friction stir processing(FSP),and the effects of aging treatment(AG)on the microstructure,microhardness and wear properties of CoCrFeNiMn/6061Al composites were studied.Scanning electron microscope(SEM)and electron back-scatter diffraction(EBSD)techniques were used to characterize the microstructure of the composites,and microhardness and wear experiments were used to evaluate the properties of the composites.The results show that after 5 passes of FSP,the CoCrFeNiMn HEA particles are uniformly distributed in the Al matrix and bonded well with the matrix interface without obvious diffusion layer.After AG,the diffusion layer with thickness of about 200 nm appears at the interface between CoCrFeNiMn HEA particles and the matrix,and the average microhardness of the composites reaches 120 HV,which is 27.7%higher than that of the Al matrix.Compared with the Al matrix,the average friction factor of the composites increases from 0.4491 to 0.4855.After AG,the average friction factor of the composites decreases to 0.3188,and the main wear mechanism is abrasive wear.

关 键 词：搅拌摩擦加工 高熵合金 AL基复合材料 微观结构 磨损性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]