表面涂覆辅助叠轧制备SiC/Al层状复合材料的组织与力学性能

Microstructure and Mechanical Properties of SiC/Al Laminated Composite Fabricated by Surface Coating Assisted Roll-bonding

以硅溶胶搭载SiC增强体的混合浆料表面涂覆为辅助,采用层叠热轧工艺制备SiC+SiO_(2)sol-Al层状复合板,并对其显微组织与力学性能进行研究。结果表明,SiC+SiO_(2)sol-Al层状复合板界面结合良好,层间结合处SiC颗粒呈断续状均匀分布于铝箔基材间层,表面覆有SiO_(2)和微量Al2O3,这有利于界面载荷传递且使铝箔基材层的晶粒尺寸更细小和均匀。断裂机制为单相铝箔层韧性断裂与层间脱粘撕裂。与纯铝箔叠轧的纯Al层状复合板相比,其抗拉强度提高,伸长率下降。

Assisted with the surface coating of the mixed slurry of silica sol carrying SiC reinforcement, the SiC+SiO_(2)sol-Al composite sheet was fabricated by laminating hot rolling, and microstructure and mechanical properties of the composites were investigated.The results indicate that the interface in SiC+SiO_(2)sol-Al composite sheet is well bonded and the surface is covered with a certain amount of SiO_(2) and a small amount of Al2O3. The introduced SiC particles are intermittently and evenly distributed in the interlayer of the aluminum foil substrate, which is conducive to interfacial load transfer and makes the grain size of the aluminum foil in SiC+SiO_(2)sol-Al composite sheet more refine and uniform.The fracture mechanism is characterized by ductile fracture and delamination tearing of single-phase aluminum foil substrate layer.Compared with the pure-Al laminated plate, the tensile strength of the composite is increased and the elongation is decreased.