HIGH STRENGTH ALUMINUM ALLOY POWDER EXCELLENT IN WORKABILITY, PREFORMED BODY THEREOF, FORMING METHOD THEREFOR, AND MANUFACTURE OF HIGH STRENGTH ALUMINUM ALLOY MEMBER

摘要

PROBLEM TO BE SOLVED: To provide an aluminum alloy powder having high speed superplasticity for manufacturing a high strength aluminum alloy member with economical advantage, a preformed body of the aluminum alloy powder, and a plastic working method therefor. ;SOLUTION: This aluminum alloy powder has a composition consisting of 1-15% of one or ≥2 kinds among transition metals of Fe, Cr, Ni, Zr, and Mn, 10-30% Si, 0.5-5% Cu, 1-5% Mg, and the balance Al and also has ≤2 μm microcrystal structure and 150 μm powder grain size. If necessary, proper amounts of ceramic powder of Al₂O₃, SiC, Si₃N₄, etc., having fine grain size are blended. This powder is preformed by means, preferably, of electric discharge plasma sintering and then subjected to compression plastic working. The compression plastic working is performed in the region right under the liquidus line. Strain working rate is regulated to ≥10^-2 /sec. High ductility of ≥200% elongation percentage is provided, and working stress is ≤20 MPa.;COPYRIGHT: (C)1999,JPO