电弧增材制造纳米TiC颗粒增强铝基复合材料组织与性能研究

Study on Microstructure and Properties of Wire Arc Additive Manufactured Aluminum Matrix Composites Reinforced by Nano-TiC Particles

在金属材料中引入第二相粒子是提高金属材料力学性能的重要手段之一。本文提出一种Al6061铝箔包裹TiC和Al6061的混合粉末形成一种特殊填料焊丝的TiC/Al6061复合材料电弧增材制造的新方法,并分别研究质量分数为1%、2%和3%的TiC颗粒对制备的铝基复合材料组织与性能的影响。结果表明,TiC质量分数为3%的复合材料与基体材料相比,试样的平均晶粒尺寸由45.5μm减小到25.3μm,细化了44.4%;抗拉强度和屈服强度由148.5 MPa和118.0 MPa提升到178.1 MPa和157.3 MPa,分别提升了19.9%和33.3%;平均显微硬度由50.5HV增加至65.2HV,提升了29.1%。理论结合及试验分析表明,TiC的载荷传递强化和晶粒细化以及Orowan强化机制,是材料力学性能提高的主要原因。

Introducing the second phase particles into metal materials is one of the important means to improve the mechanical properties of metal materials.In this paper,a new arc additive manufacturing method of TiC/Al6061 composite material coated with TiC reinforced particles in aluminum foil to form a specialfiller welding wire is presented.The effects of 1%,2%and 3%TiC reinforced particles on the microstructure and properties of aluminum matrix composites were investigated.The results show that:Compared with the matrix material,the average grain size of the composite material with TiC mass fraction of 3%decreased from 45.5μm to 25.3μm,and the tensile strength and yield strength increased from 148.5 MPa and 118.0 MPa to 178.1 MPa and 157.3 MPa,which increased by 19.9%and 33.3%,respectively.The average microhardness increased from 50.5HV to 65.2HV,which increased by 29.1%.The results show that the load transfer strengthening and grain refinement of TiC and Orowan strengthening mechanism are the main reasons for the improvement of mechanical properties of the materials.