SiC_p/Al复合材料制备工艺对组织与性能的影响

The effect of fabricating processes on the microstructure and properties of SiC_p/Al composites

采用高能球磨粉末冶金法制备了体积分数为 15 %SiCp/ 2 0 0 9Al复合材料 ,研究了球磨转速、球磨时间对复合材料组织和性能的影响。结果表明 ,球磨转速和球磨时间是影响复合材料力学性能的重要因素 ,较长时间高转速球磨使得SiC颗粒均匀分布 ,转速 190r/min、球磨 6h制备的复合粉末经真空热压、挤压后的复合材料SiC颗粒均匀分布 ,材料的抗拉强度高达 6 5 0MPa,伸长率大于 5 %。

A 15vol%SiC p/2009Al composites was fabricated through high energy milling with powder metallurgy (PM) technique. Effect of rotational speed and time of milling on mechanical properties of composites was investigated. The results indicate that the two factors above are important to properties of composites. Long time and high speed of milling make a uniform distribution of SiC particle. The composite hot-pressed and extruded with powder milled at speed of 190r/min for 6 hours has uniform SiC distribution, tensile strength of 650 MPa and elongation of 5%.