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Metals 2016, 6(11), 286; doi:10.3390/met6110286

Effect of the Thermodynamic Behavior of Selective Laser Melting on the Formation of In situ Oxide Dispersion-Strengthened Aluminum-Based Composites

1
Shanghai Aerospace Equipments Manufacturer, Shanghai 200245, China
2
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing 210016, China
3
Institute of Additive Manufacturing (3D Printing), Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing 210016, China
4
Material Science and Engineering Department, Tongji University, Shanghai 200092, China
5
Shanghai Research Center of Complex Metal Parts by Additive Manufacturing, Shanghai 200245, China
*
Author to whom correspondence should be addressed.
Academic Editor: Manoj Gupta
Received: 18 July 2016 / Revised: 8 November 2016 / Accepted: 9 November 2016 / Published: 19 November 2016
(This article belongs to the Special Issue 3D Printing of Metals)
View Full-Text   |   Download PDF [2043 KB, uploaded 19 November 2016]   |  

Abstract

This paper presents a comprehensive investigation of the phase and microstructure, the thermodynamic behavior within the molten pool, and the growth mechanism of in situ oxide dispersion-strengthened (ODS) aluminum-based composites processed by a selective laser melting (SLM) additive manufacturing/3D printing process. The phase and microstructure were characterized by X-ray diffraction (XRD) and a scanning electronic microscope (SEM) equipped with EDX, respectively. The thermodynamic behavior within the molten pool was investigated for a comprehensive understanding on the growth mechanism of the SLM-processed composite using a finite volume method (FVM). The results revealed that the in situ Al2Si4O10 ODS Al-based composites were successfully fabricated by SLM. Combined with the XRD spectrum and EDX analysis, the new silica-rich Al2Si4O10 reinforcing phase was identified, which was dispersed around the grain boundaries of the aluminum matrix under a reasonable laser power of 200 W. Combined with the activity of Marangoni convection and repulsion forces, the characteristic microstructure of SLM-processed Al2Si4O10 ODS Al-based composites tended to transfer from the irregular network structure to the nearly sphere-like network structure in regular form by increasing the laser power. The formation mechanism of the microstructure of SLM-processed Al2Si4O10 ODS Al-based composites is thoroughly discussed herein. View Full-Text
Keywords: selective laser melting; aluminum matrix composites; microstructure; thermodynamic behavior; formation mechanism selective laser melting; aluminum matrix composites; microstructure; thermodynamic behavior; formation mechanism
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, L.; Jue, J.; Xia, M.; Guo, L.; Yan, B.; Gu, D. Effect of the Thermodynamic Behavior of Selective Laser Melting on the Formation of In situ Oxide Dispersion-Strengthened Aluminum-Based Composites. Metals 2016, 6, 286.

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