(中南工业大学非平衡材料科学与工程研究所，长沙 410083)
摘 要: 研究了6061Al/SiCp颗粒增强复合材料的喷射沉积+热挤压工艺及材料的组织特征与力学性能。喷射沉积工艺可以获得增强颗粒均匀分布，无界面反应的大尺寸复合材料锭坯，实验锭坯尺寸达d200 mm×250 mm，热挤压工艺进一步使锭坯致密，增强颗粒分布改善。挤压材料组织细小，过饱和度大，析出相细小、分布弥散，峰时效时间 约为传统制度的一半, 且力学性能极大地改善，可达σb=439 MPa,σ0.2=409 MPa，δ=10.4%。
关键字: 喷射沉积 复合材料 铝合金 碳化硅
（Institute of Non-equilibrium Materials Science and Technology,
Central South University of Technology, Changsha 410083, P. R. China）
Abstract:Spray deposition and hot extrusion process for producing 6061Al/SiCp composites and the material's microstructure feature and mechanical properties were studied. As-sprayed large scale composites have uniformly distributed reinforcing particles, and there is no apparent interface reaction. Hot extrusion can densify billets and improve the distribution of particles. As-extruded microstructure is fine and of excess solution, with fine and discattered precipitates. The peak aging time is half that of traditional ones. The mechanical properties improve greatly, and are up to σb=439 MPa, σ0.2=409 MPa, δ=10.4%.
Key words: spray deposition composites mechanical properties
silicon carbide
