鋳造用アルミニウム合金の機械的性質に及ぼす急冷凝固の効果 Effect of rapid solidification of the mechanical properties of aluminum casting alloys
For the purpose of attaining property improvement of commercial aluminum casting alloys by the rapid solidification and P/M method, rapidly solidified flakes were produced by argon gas atomization and subsequent splat quenching onto a water-cooled copper roll. The flakes were consolidated to P/M materials by cold pressing, vacuum degassing and hot extrusion at a reduction of 25:1. The P/M material of JIS AC9A alloy shows the highest hardness and that of JIS AC4C alloy shows the lowest hardness among the tested alloys. Both tensile strength and elongation of as-extruded P/M materials are higher than those of I/M materials. The highest increase of tensile strength was obtained in hyper-eutectic AC9A alloy. Increase in tensile strength due to rapid solidification is in correlation with the total amount of alloying elements forming second phase particles in the aluminum matrix.
軽金属 47(1), 3-9, 1997-01-30
The Japan Institute of Light Metals