Microstructure and Properties of SiCp/Al Composite Materials Fabricated via Powder Packed Resistance Additive Manufacturing

基于粉末堆积电阻增材制备SiCp/Al复合材料的组织与性能

SiC particle(SiCp)/Al composite materials were fabricated via powder packed resistance seam welding additive manufacturing.The influence of welding speed on microstructure and mechanical properties of the specimen was investigated,elucidating the formation and fracture mechanism of single-pass multi-layer deposition.The results demonstrate that a dense internal structure of the specimen characterized by uniformly dispersed SiCp embedded within the Al matrix is formed.However,particle agglomeration and porosity defects are observed.The porosity increases with the increase in welding speed,and the microstructure of the RSAM-24 specimen has the highest density,characterized by a density of 2.706 g/cm^(3)and a porosity of 1.672%.The mechanical properties of the specimens decrease as the welding speed increases.Optimal mechanical properties are obtained when the welding speed is set as 24 cm/min.Specifically,the average hardness,tensile strength and elongation values are 463.736 MPa,52.16 MPa and 2.2%,respectively.The tensile specimens predominantly exhibit fracture along the interlayer bonding interface and the interface between the Al matrix and SiC particles,and the damage mode is ductile fracture.

探讨了粉末填充电阻缝焊增材制造方法制备SiCp/Al复合材料。研究了焊接速度对试样显微组织和力学性能的影响,揭示了单道多层沉积层的成形及断裂机理。结果表明:SiC颗粒分布在Al基质上,存在团聚和气孔缺陷。孔隙率随焊接速度的增加而升高,RSAM-24试样组织最致密,密度和孔隙率分别为2.706 g/cm3和1.672%。试样的力学性能随焊接速度的增加而降低,焊接速度为24 cm/min时试样的力学性能最佳,平均硬度、抗拉伸强度和延伸率分别为463.736 MPa、52.16 MPa和2.2%。拉伸试样主要沿层间结合界面和Al基体与SiC颗粒结合界面处开裂,断裂方式为韧性断裂。