摘要
采用粉末冶金+挤压工艺制备了含不同粒径SiC颗粒(3.5, 5.0, 10.0和15.0μm)的15%SiCp/2009A1复合材料挤压棒材,利用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)和万能试验机研究了SiC颗粒尺寸对15%SiCp/2009Al复合材料力学性能的影响。结果表明, SiC颗粒尺寸对复合材料强度和韧性的影响效果十分显著。随着SiC颗粒从3.5μm增大至15μm,复合材料的强度逐渐减小,而延伸率则逐渐增大。SiC颗粒尺寸为5.0μm时,复合材料的强度和塑性最佳,抗拉强度(Rm)、屈服强度(Rp0.2)分别为582, 382 MPa,延伸率(A)为10%,断裂韧性(KIC)为33.7 MPa·m1/2。SiC颗粒尺寸为3.5μm时,复合材料的断裂以SiC颗粒周围的铝基体韧性撕裂为主, SiC颗粒尺寸超过5.0μm时,复合材料断裂方式为SiC颗粒周围的铝基体韧性撕裂和SiC颗粒脆性断裂的共同作用,由于SiC-Al界面结合较好,未发现SiC-Al界面脱粘的失效形式。
15%SiCp/2009 Al composites bars with various sizes of SiC particles(3.5, 5.0, 10.0 and 15.0 μm) were fabricated via elemental powder metallurgical and extrusion processing. The effects of SiC particles size on mechanical properties of the composites were studied by optical microscopy(OM), scanning electronic microscopy(SEM), transmission electron microscope(TEM) and universal testing machine. The results indicated that SiC particles sizes had great influence on the strength and toughness of composites. With the increase of SiC particles from 3.5 to 15.0 μm, the strength of the composites decreased gradually, while the elongation increased. The composite reinforced with 5.0 μm SiC particles had the best strength and plasticity. The tensile strength(Rm), yield strength(Rp0.2), elongation(A), and fracture toughness(KIC) were 582, 382 MPa, 10%, and 33.7 MPa·m1/2, individually. When the size of SiC particles was 3.5 μm, the breakage was due to tearing of matrix near SiC particles. When the size of SiC particles was more than 5.0 μm, the failure of composite resulted from tearing of matrix near SiC particles and crack of SiC particles. However, there were no debonding of SiC-Al interface because of excellent interface bond between SiC and Al.
作者
魏少华
聂俊辉
刘彦强
郝心想
马自力
樊建中
Wei Shaohua;Nie Junhui;Liu Yanqiang;Hao Xinxiang;Ma Zili;Fan Jianzhong(General Research Institute for Nonferrous Metals,Beijing 100088,China;GRIM AT Engineering Institute Co.,Ltd.,National Engineering Technology Center for Nonferrous Metal Composites,Beijing 101407,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2020年第2期147-152,共6页
Chinese Journal of Rare Metals
基金
国家重点研发计划项目(2017YFB0703104,2018YFB0704401)资助。
