Effects of Hot Extrusion Parameters on Microstructure and Properties of RS P/M Al-7Fe-l.4Mo-l.4Si Alloy Based Composites

摘要

Low density damping composites of compositions Al-7Fe-l.4Mo-l.4Si (FMS0714) /15A1 and FMS0714/15(Zn-30Al) (wt.%) were prepared by the rapidly solidified powder metallurgy process. Effects of extrusion temperature and extrusion ratio on their microstructures, tensile properties and damping capacities were investigated. The results indicate that, at a constant extrusion ratio, for FMS0714/15A1, with increasing extrusion temperature from 380℃ to 520℃, the elongation increases, but the strengths decrease remarkably. Increase of extrusion temperature produces little effect on the damping capacity and Young's modulus. For FMS0714/15(Zn-30Al), with increasing the extrusion temperature from 410℃ to 445 ℃, the strengths and Young's modulus change little, but elongation and damping capacity decrease remarkably. At a constant extrusion temperature, with increasing the extrusion ratio from 6.3:1 to 17.4:1, for both composites, elongation is improved; while strengths, damping capacities and Young's modulus remain unchanged. By comparison, FMS0714/15(Zn-30Al) exhibits better damping capacity than FMS0714/15A1. The results are discussed according to their microstructures.