拉拔压下量对车用Al2O3/Cu复合材料组织和硬度的影响  

Effects of Drawing Reduction on Microstructure and Hardness of Automotive Al2O3/Cu Composites

作　　者：韩东艳[1] 贾爱芹 邱文 HAN Dongyan;JIA Aiqin;QIU Wen(School of Transportation,Huanghe Science and Technology College,Zhengzhou 450000,China;Automotive College,Chang＇an University,Xi＇an 710018,China)

机构地区：[1]黄河科技学院交通学院,河南郑州450000 [2]长安大学汽车学院,陕西西安710018

出　　处：《热加工工艺》2018年第16期133-135,共3页Hot Working Technology

摘　　要：通过TEM和微观组织观察等技术,研究Cu基Al2O3增强复合材料在不同拉拔压下量下拔变形过程的显微组织和硬度的演变规律。研究结果表明：铜基体中弥散分布着含量众多的纳米级球形Al2O3颗粒,其尺寸在30~50nm之间;随着拉拔压下量的增加,晶粒中位错缠结,均匀度提高;与拉拔方向一致的晶粒尺寸明显被拉长,复合材料晶粒长宽比呈现出明显增大的变化规律。复合材料硬度随拉拔压下量增大而上升;在拉拔压下量低于80%时,硬度表现出抛物线形的变化规律;在压下量达到90%以上时,试样硬度的上升幅度明显增加;压下量为95%时硬度达到最大199 HV。The microstructure and hardness evolution of Al2O3reinforced Cu based composites during the drawing deformation process were studied by TEM and microstructure observation techniques under different drawings.The results show that there are many nanoscale spherical Al2O3particles dispersively distributed on the copper matrix with size between30-50 nm.With the drawing reduction increasing,the grains dislocation tangles and the evenness increases,along the direction of drawing the grains are significantly elongated,and the grain length-width ratio of the composites increases obviously.With the drawing reduction increasing,the composites hardness also increases;when the drawing reduction is lower than 80%,the hardness show the parabolic changing rule;when the drawing is over 90%,the sample hardness increases significantly.When the reduction is 95%,the hardness reaches maximum of 199 HV.

关 键 词：CU基复合材料 Al2O3增强 形变织构 显微组织 

分 类 号：TB333.1[一般工业技术—材料科学与工程]