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Clarifying the mechanism of superheating effect and using it to enhance the ductility of cast Al-Si alloys via refining both Si and Al phase

阐明过热效应的机理并通过细化 Si 和 Al 相来提高铸造 Al-Si 合金的延展性

基本信息

批准号：
21K14432
负责人：
卞華康
金额：
$ 2.41万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Early-Career Scientists
财政年份：
2021
资助国家：
日本
起止时间：
2021-04-01 至 2022-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21K14432/
关键词：
Superheating AlSI alloy EBM Additive manufactuing Al-Si refining

项目摘要

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.

最近，基于电子束熔炼(EBM)过程中的过热效应，通过细化Si和Al组织，AlSi10 Mg合金获得了高达33%的室温拉伸塑性。因此，利用这种过热效应可以细化铸造Al-Si合金(包括Al-Si10、Al-Si20和Al-Si30合金)的组织，以提高塑性和强度。目前，人们已经研究了过热效应细化Al-Si合金组织的机理。较高的内熔池温度和较快的冷却速度使熔体内熔池均匀。在冷却过程中，特别是当温度降低到1300-1000℃时，在凝固过程中出现了Al和Si纳米团簇，并形成了细小的晶粒。此外，还对Al10Si、Al20Si和Al30Si的表面进行了单珠实验。显微组织观察表明，EBM单珠可以细化AlSi10和AlSi20合金的组织，但只能重熔AlSi30合金的部分Al基体。