增强体颗粒尺寸对SiC_p/2124Al复合材料变形行为的影响

Effects of Particle Reinforcement Size on Deformation Behavior of SiC_p/2124Al Composites

利用常规静态单向拉伸技术,研究了SiC颗粒尺寸对用粉末冶金工艺制得的SiC颗粒增强2124Al合金(SiCp/2124Al)变形行为和力学性能的影响.在体积比为20%的条件下,SiC颗粒尺寸在0.2～48μm的范围内变化,无论室温还是300℃,材料的变形行为和拉伸力学性能明显取决于SiC颗粒尺寸.研究表明,材料中的空隙密度、SiC颗粒的间距、分布状态以及SiC颗粒的断裂、SiC颗粒/Al界面的脱粘和基体材料的开裂等几种因素共同影响着复合材料的变形行为和力学性能.

The effect of SiC particle size on tensile properties and deformation behavior was investigated in SiC particle reinforced 2124Al alloy matrix (SiC p/2124Al) composite, which is fabricated by powder metallurgy process, by the general uniaxial static tension. The SiC particle was systematically varied in size from 0.2 μm to 48 μm with an identical volume fraction of 20%. The mechanical properties and deformation behavior of the composite were sensitively dependent on the SiC particle size both at room temperature and 300℃. The pore density, interparticle spacing of SiC particles, SiC particle cracking, SiC p/Al interfacial debonding, the distribution of reinforcement particles, etc. are considered as factors determining the tensile properties and deformation behavior of the composite.