About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Al Nanoparticle inside Si Grain of Al-Si Alloy by Powder Bed Fusion Using an Electron Beam |
Author(s) |
Kenta Ishigami, Kenta Aoyagi, Huakang Bian, Akihiko Chiba, Yoshiki Hashizume, Akiei Tanaka |
On-Site Speaker (Planned) |
Kenta Ishigami |
Abstract Scope |
Microstructure refinement of Al-Si alloy is needed for improving mechanical property. In casting of Al-Si alloy, additives like Sr or TiB<sub>2</sub> are used for microstructure refinement. Additive manufacturing can refine microstructure of Al-Si alloy without additives because of superheating and rapid cooling. Additive manufacturing using electron beam is attractive for Al alloy due to its high absorptivity of electron beam. Therefore, we have investigated properties of Al-Si alloy made by powder bed fusion using an electron beam in detail. As a result, microstructure of the Al-Si alloy depended on the position along the building direction. Scanning transmission electron microscopy analysis revealed that Al nanoparticles formed in Si grains. The number density of fine particles also depended on the position along the building direction. |