喷射共沉积SiCp/Al复合材料的组织与力学性能

Microsturcture and Mechanical Properties of SiCp/Al Composites Made by Spray Co-deposition

摘要: 用喷射共沉积技术制备了含35vol%SiC的SiCp/Al复合材料。用扫描电镜观察了这种复合材料沉积态的孔隙和SiC颗粒分布。在拉伸实验机上测量了不同工艺条件下制备的SiCp/Al的应力-应变曲线,用扫描电镜观察了雾化前先抽真空、再充氮气保护工艺条件下得到的SiCp/Al经热压后拉伸试样的断口形貌。实验结果表明,沉积态复合材料孔隙数量较少、尺寸较小,SiC分布均匀。雾化前抽真空并充氮气、热压均可提高屈服强度、拉伸强度和伸长率。拉伸断口的扫描电镜观察结果表明,材料的断裂方式为微孔聚集型断裂。

Abstract: The SiCp/Al composites with 35 vol% SiCp have been made by spray co deposition.Pores and distribution of Sic particles in the composites as deposited has beenobserved with SEM.The stress strain curves of SiCp/Al composites from seveal processes have been obtained in tensile apparatus.The chamber is vacuumized,nitrogen is filled before atomization and as deposited composite is hotpressed then the morphology of the fracture surface has been investigated by SEM.The results show that the composite as-deposited has low porosity,small pore dimensions and uniform distribution of SiC particles,the yield strength,tensile strength and elogation are elevated,and the fracture mechanism of the SiCp/Al composites is pore aggragation.