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Additive Manufacturing of Al-12Si Alloy Via Pulsed Selective Laser Melting
- 作者:R. Chou ; J. Milligan ; M. Paliwal ; M. Brochu
- 刊名:JOM Journal of the Minerals, Metals and Materials Society
- 出版年:2015
- 出版时间:March 2015
- 年:2015
- 卷:67
- 期:3
- 页码:590-596
- 全文大小:1,279 KB
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文摘
Additive manufacturing (AM) of metallic materials is experiencing a research and commercialization craze in almost all industrial sectors. However, to date, AM has been limited to a small numbers of alloys. With respect to aluminum, two alloys received some attention: Al-12Si and Al-10Si-1Mg. In both cases, fully dense components have been achieved using a continuous-wave selective laser melting system. In this article, a new approach of selective laser melting using a pulsed-laser source as opposed to a continuous-wave laser is proposed. Pulse selective laser melting (P-SLM) would allow for greater control over the heat input and thus further optimization possibilities of the microstructure. P-SLM was demonstrated using the Al-12Si system. Si refinement below 200?nm was achieved throughout the component. Density up to 95% and high hardness of above 135 HV were obtained. The solidification mechanism is also explained.
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