真空热压烧结制备SiCp/2024Al复合材料动态力学性能  

Research on dynamic mechanical properties of SiCp/2024Al composites prepared by hot-pressing sintering

作　　者：谢文芳 王行[2,3] XIE Wenfang;WANG Hang(Luoyang Institute of Electro-Optical Equipment,AVIC,Luoyang 471000,China;Materials Science and Engineering School of Henan University of Science and Technology,Luoyang 471003,China;Luoyang CITIC HIC Casting and Forging Co.,Ltd.,Luoyang 471039,China)

机构地区：[1]中国航空工业集团公司洛阳电光设备研究所,河南洛阳471000 [2]河南科技大学材料科学与工程学院,河南洛阳471003 [3]洛阳中重铸锻有限责任公司,河南洛阳471039

出　　处：《粉末冶金工业》2021年第2期47-51,共5页Powder Metallurgy Industry

基　　金：国家自然科学基金资助项目(51771070)。

摘　　要：通过真空热压烧结制备30%(体积分数)SiCp/2024Al复合材料,采用分离式霍普金森压杆(SHPB)对其进行动态压缩实验,得到应变速率为1600~3800 s-1的动态应力-应变曲线。结果表明:在一定的高应变率范围内承受动态载荷时,30%SiCp/2024Al复合材料在不同应变率下,应力-应变曲线趋势变化不大,基本表现为应变率不敏感材料。试样在动态冲击下均未出现宏观剪切破坏,采用扫描电镜(SEM)对压缩试样微观组织进行表征,高应变率试样内部出现孔洞和微裂纹等损伤,试样边界出现增强体颗粒脱粘现象,材料表现出良好的塑韧性。还讨论了动态载荷压缩变形机制。30% SiCp/2024 Al composites was prepared by vacuum hot-pressing sintering, and a dynamic compression experiment was performed using a Split Hopkinson Pressure Bar(SHPB) to obtain a dynamic stress with a strain rate of 1 600-3 800 s-1 strain curve. The results show that the trend of stress-strain curve of 30%SiCp/2024 Al composites material does not change much under different strain rates when subjected to dynamic load in a certain range of high strain rates, which is basically rate-insensitive material. The specimens don’t show macroscopic shear failure under dynamic impact. Scanning electron microscopy(SEM) is used to characterize the microstructure of the compressed specimens. Damages such as holes and microcracks appeare inside the specimens, and debonding of reinforcement particles occurre at the specimen boundaries. The material shows good plastic toughness. This paper also discusseses the fundamentals of compressive deformation under dynamic loading.

关 键 词：真空热压烧结 复合材料 分离式霍普金森压杆 高应变率 动态力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]