(1. 淮海工學院 機械工程學院, 連云港 222005；
2. 湖南大學 材料科學與工程學院, 長沙 410082)
摘 要: 采用多層噴射沉積工藝制備SiCp/Al-Fe-V-Si復合材料，并分別通過擠壓后軋制和熱壓后軋制工藝制備了板材，分析了復合材料不同狀態(tài)下的顯微組織、物相和力學性能，并研究在軋制過程中復合材料密度和硬度的變化規(guī)律。結(jié)果表明：擠壓后軋制和熱壓后軋制均能有效致密沉積坯。與擠壓后再軋制相比，熱壓后再軋制材料組織更均勻細小，力學性能更優(yōu)秀。擠壓后再軋制板材抗拉強度為535 MPa，伸長率為4.0%，壓下25%前，擠壓坯的密度和硬度隨之降低；當壓下25%時，密度和硬度升高。熱壓后軋制板材抗拉強度達580 MPa，伸長率達6.3%，壓下量低于10%時，熱壓坯密度與硬度隨壓下量升高；壓下10%至40%，密度和硬度下降；壓下量高于40%后，密度與硬度升高。對于兩種材料，隨著壓下量的增加，軋制過程中密度與硬度的變化規(guī)律都一致。
關(guān)鍵字: 耐熱鋁合金；復合材料；噴射沉積；板材成形；顯微組織；力學性能
（1. College of Mechanical Engineering, Huaihai Institute of Technology, Lianyungang 222005, China;
2. College of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:SiCp/Al-Fe-V-Si composite prepared by multi-layer spray deposition was densified by rolling process after extruding and rolling after pressing. The microstructure, phases and mechanical properties of the composite under different conditions were analyzed. And the density and hardness evolution of the composite during rolling process were investigated. The results show that the composite deposits can be densified and strengthened efficiently by rolling processes after extruding and pressing separately. More homogeneous, finer microstructure and more excellent mechanical properties of the composite are obtained by rolling process after pressing than by rolling process after extruding. The tensile strength and elongation of the composite as-rolled after extruding are 535 MPa and 4.0%, both of hardness and density of the composite as-extruded decrease firstly when reduction is below 25% and then raise during rolling process, which agrees with density evolution. The tensile strength and elongation of the composite as-rolled after pressing are 580 MPa and 6.3%. And those of the as-pressed composite firstly when reduction is below 10%, then decrease until the reduction reaches 40%, and finally rise during rolling process. The hardness varies as density does with reduction increases during rolling process for both of the composites.
Key words: heat resistant alloy; spray deposition; composite; sheet forming; microstructure; mechanical property
