ABSTRACT
Keywords: sinter; Mn-Cu; damping; porous; alloy
(99.5%), and iron (99%). The powders in weight fraction of 73.15% Mn, 20.04% Cu, 4.84% Ni, and 1.97% Fe, were ball-milled in vacuum for 0.5 h and pressurized into green compact with the size of 30 × 30 × 100 mm3. The billets were sintered at 1233 K for 1.5 h in hydrogen atmosphere at 1 atm and then were cut into suitable specimens by wire-electrode cutting. The specimens were solid solution treated at 1123 or 1173 K for 1.5 h and were rapid cooled in a gas quenching furnace, following aging treatment at 723 K for 4 h with furnace cooling. In order to avoid oxidation, the above treatments were carried out in vacuum. The density of sintered porous alloys was determined by mass/volume measurement. The damping capacities of the samples were examined using a Dynamic Mechanical Analyzer (DMA) at frequencies ranging from 0.1 to 100 Hz and the strain amplitude of 5 × 10-5. The microstructures of the Mn-Cu alloys were investigated by X-Ray Diffraction (XRD) and Optical Microscopy (OM).
