| 研究実績の概要 |
Recently, a high tensile ductility upto 33% at room temperature in AlSi10Mg alloy has been obtained via refining both the Si and Al microstructure based on the superheating effect during electron beam melting (EBM) manufacturing. Thus, the microstructure of cast Al-Si alloys (including Al-Si10, Al-Si20, and Al-Si30 alloys) is expected to be refined to enhance both the ductility and strength using this superheating effect.
By now, the mechanism of superheating effect for refining the microstructure of Al-Si alloy using EBM building process has been investigated. The higher temperature inner melting pool and the fast-cooling rate make the homogeneous melt liquid inner melt pool. During the cooling process especially when the temperature is decreased to 1300-1000 ℃, the Al and Si nanocluster occurred and form the fine grains in the solidification. Beside that, the single bead experiment on the surface of Al10Si, Al20Si and Al30Si have been conducted. The microstructure observation showed that EBM single bead could refine the microstructure in AlSi10 and AlSi20 alloy, but only can remelt part of the Al matrix in AlSi30 alloy.
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