Melting and Solidification Behavior of High-Strength Aluminum Alloy during Selective Laser Melting

Abstract:

Additive manufacturing (AM) technology has been dramatically attracted attention because of advantages in building free-shaped parts and simplification of manufacturing process. Recently the most relevant alloys, such as TiAl6V4, Inconel 718, AlSi10Mg and so on, are able to manufacture the parts using metal AM technology. However high-strength 2024, 6061 and 7075 aluminum alloys are difficult to fabricate using selective laser melting (SLM) owing to solidification cracking during solidification. In this research, the melting and solidification behaviors of AlSi10Mg alloy during SLM process were observed under various fabrication conditions of laser power and scan speed using a high-speed camera. It was found that the melting and solidification behavior of the alloy is greatly different by the fabrication conditions. And also the mechanism of solidification cracking in 2024 and 6061 aluminum alloys is investigated by the observation of the surface morphology and microstructure of the alloys using OM, SEM and EDS, comparing with Al10SiMg alloy. As a result, crack-free 2024 and 6061 aluminum alloy parts can be obtained by fabrication at the higer enrgy density.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 1300-1305
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.1300
• Online since: December 2018
• Authors: Hideki Kyogoku*, Kohei Yamamoto, Toshi Taka Ikeshoji, Kazuya Nakamura, Makiko Yonehara
• Keywords: Additive Manufacturing (AM), High-Strength Aluminum Alloy, Microstructure, Selective Laser Melting, Solidification Behavior

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