抄録
Al-4, 8, or 12 mass % Cu alloy melt flowing out through a small nozzle located at the bottom of the quartz tube container was rapidly solidified in a tube on a rotating copper substrate which was pulled down into water. Fusion-weldability between layers, shape stability and microstructure were investigated as functions of alloy composition, superheat and rotation speed of the substrate. Good weldability between the layers and steady shape forming were achieved with smaller superheat and higher rotation speed. Better shape stability was obtained for hypo-eutectic alloys. The microstructure of the tube specimen subjected to the fused spinning deposition process was found to consist of fine equiaxed grains and the specimen exhibited tensile strength 1.5 times higher than metal-mold cast alloys with a fine columnar structure. The solidification analysis showed that the equiaxed grain structure is formed as a result of the cyclic remelting and solidification process.
