等径角挤压道次对SiC_p/Al复合材料显微组织的影响

为改善超高强度SiCp/Al复合材料的塑性,以Bc路径对喷射沉积SiCp/7090Al（SiC颗粒体积分数15%,名义尺寸10μm）复合材料进行等径角挤压变形,研究了复合材料显微组织和力学性能的演变规律.结果表明：经过4个道次变形后,获得等轴晶粒,尺寸大约为400 nm;SiC颗粒在剪切应力作用下被破碎,尺寸约2μm;...

Effect of pass on microstructure and mechanical properties of SiC_p/Al composite by equal chnnel angular pressing

To improve the elongation of ultra-high strength SiCp/Al composite,equal channel angular pressing(ECAP) of Bc route was performed on an ultra-high strength SiCp/7090Al(the volume of SiC particles is about 15%,and the size is about 10 μm) composite,and the microstructures and mechanical properties were discussed.The results show that equiaxed grains with the average grain size of about 400 nm were obtained after four passes,and hard SiC particles were broken to 2 μm by the shear stress.Many cavities between the broken SiC fragments were filled with the matrix and they flew with the matrix in a certain range,which made the distribution of SiC in the matrix alloy homogeneous.The tensile strength,the yield strength,the modulus and the elongation of the composite after peak ageing treatment were 770.0 MPa,575.0 MPa,106.6 GPa and 7.4% respectively.