急冷凝固Al-Si合金粉末の爆発圧縮成形

概要

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Explosive compaction is one of the efficient compacting method in forming the hard material powders. In this study, cylindrically axi-symmetric direct explosive method has been applied to the rapidly solidified Al-Si alloy powders for forming the light weight, heat- and wear-resistant materials. The effects of the mass of explosive and the sintering on the structures and properties of compacts have been investigated by means of microscopy and mechanical tests.<BR>When the powders were compacted at the ratio of explosive mass to powder mass (E/M ratio) lower than 12, the compacts showed low density and hardness. On the other hand, radial cracks and mach stem were formed in the compacts at the E/M ratio more than 12. To form the sound and densfied compacts, it was found that all of the powders should be compacted at the E/M ratio of 12, resulting in high density (97-98%) and high hardness (97HRB) which is higher than that of the heat-extruded materials. However, the compacts were brittle even after the sintering. This seemed to be caused by some cracks and defects introduced by machining the tensile specimen.
社団法人粉体粉末冶金協会の論文