Patent ID: 7651659

Claim:
A method of manufacturing a sintered aluminum-based part exhibiting a tensile strength of 480 MPa or more and an elongation of 2% or more, comprising: preparing a raw material powder comprising, by mass: 3.0 to 10% zinc; 0.5 to 5.0% magnesium, 0.5 to 5.0% copper, inevitable amount of impurities; and aluminum, with use of at least 15 mass % of a simple aluminum powder relative to the raw material powder, wherein the zinc content of the raw material powder is in the form of an aluminum-zinc alloy powder; forming the raw material powder into a compact having a density ratio of 90% or more by pressing the raw material powder at a pressure of 200 MPa or more; sintering the compact in a non-oxidizing atmosphere in such a manner as to heat the compact at a sintering temperature of 590 to 610 degrees C. for 10 minutes or more, before cooling the sintered compact; and forging the sintered compact having a density ratio of 93% or more, by pressing the sintered compact in a pressing direction at an upsetting ratio of 10% or more to compress the sintered compact in the pressing direction and produce plastic flow of material in a direction crossing to the pressing direction, with the density ratio of the forged compact increasing to 98% or more and pores of the forged compact closed and formed with metallic bond, wherein the forging comprises one of cold forging and hot forging, the cold forging comprising pressing the sintered compact at a room temperature with an upsetting ratio being in a range of 10 to 40%, and the hot forging comprising pressing the sintered compact at a temperature of 100 to 450 degrees C. with an upsetting ratio being in a range of 10 to 70%.