高能球磨粉末冶金制备工艺对15%SiC_p/2009Al复合材料性能的影响

EFFECT OF POWDER METALLURGY PROCESSES BY HIGH ENERGY BALL MILLING ON THE MECHANICAL PROPERTIES OF 15%SiC_p/2009Al COMPOSITE

采用高能球磨粉末冶金法制备了15%SiCp/2009Al复合材料,研究了球磨转速、球磨时间、加热抽真空工艺、热压成型以及热挤压比对复合材料力学性能的影响。结果表明,球磨转速和时间、热压成型工艺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SiC颗粒均匀分布,高温真空热压改善粉末之间的结合是获得高性能复合材料的关键。转速190r/min、球磨6h制备的复合粉末经高温真空热压、挤压后的复合材料SiC颗粒均匀分布,材料的抗拉强度高达650MPa,延伸率大于5%。

A 15%SiCp/2009Al composite was fabricated by high energy milling powder metallurgy (PM) technique. The effect of velocity and time of milling as well as PM procedure on mechanical properties of the composite was investigated. The results indicate that three procedure factors are important for properties of the composite. Long duration at high speed of milling contributes to a uniform distribution of SiC particles. Compression at high temperature and vacuum can improve bonding among powder and particle, and lead to high properties. The milled powder fabricated at velocity of 190 r/min and 6 h was compacted and extruded into the composite with uniform distribution of SiC particles, and with 650 MPa of tensile strength and exceeded 5% of elongation.