Variations of Solidified structure by changing the cooling rates in the eutectic composition of Al-Si alloy
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概要
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An eutectic Al-Si alloy melted at 800 °C and poured into a metallic mold. Cooling rate of the molten metal was varied according to the thickness of castings; 0.05, 0.09, 0.16, 0.35, 0.54, 2.42, and 3.38 mm. Microstructures of eutectic solidified regions were mainly observed by electron microscopy.A plain bright area appeared in the eutectic region in the lower part of the specimen of 0.05 mm, where the cooling rate was at the highest. The cooling rate of the upper part of specimen was lower than that of the lower part. Many precipitated spots in the upper part were arranged in a dotted line on the grain boundary of primary α crystals. In the specimen of 0.09 mm, many precipitated spots appeared at random in the bright eutectic solidified area only. In the specimen of more than 0.16 mm in thickness, the bright area was changed to two phases, α and Si, which were entirely mixed each other. In the specimen of further more thickend, the growth of α phase of the eutectic region was more accelerated with the increase of thickness, and the grain boundary between primary crystals and α phase of eutectic region was observed more indistinctly in microstructure. Then, the microstructure of the specimen of 2.42 mm was very simple, in which large eutectic Si grains were scattered in the continuous α phase.The change of microstructures was varied according to the quenching rate of molten metal even when the specimen was rapidly cooled.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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