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Volume 12
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10.3390/ma12010073
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Article

Impacts of Defocusing Amount and Molten Pool Boundaries on Mechanical Properties and Microstructure of Selective Laser Melted AlSi10Mg

by
Suyuan Zhou
1,2,
Yang Su
1,
Rui Gu
1,
Zhenyu Wang
1,
Yinghao Zhou
1,
Qian Ma
3 and
Ming Yan
1,*
1
Department of Materials Science and Engineering Shenzhen Key Laboratory for Additive Manufacturing of High-Performance Materials, South University of Science and Technology of China, Shenzhen 518055, China
2
Key Laboratory of Artificial Micro- and Nano-Materials of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China
3
Centre for Additive Manufacture, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
*
Author to whom correspondence should be addressed.
Materials 2019, 12(1), 73; https://doi.org/10.3390/ma12010073
Received: 23 November 2018 / Revised: 10 December 2018 / Accepted: 18 December 2018 / Published: 26 December 2018
(This article belongs to the Collection Additive Manufacturing: Alloy Design and Process Innovations)
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Abstract

The influences of processing parameters such as volumetric energy density (ε) and, particularly, defocusing amount (DA) on densification, microstructure, tensile property, and hardness of the as-printed dense AlSi10Mg alloy by selective laser melting (SLM) were studied systematically. The molten pool boundaries (MPBs) were found overwhelmingly at regular and complex spatial topological structures affected by DA value to exist in two forms, while the “layer–layer” MPB overlay mutually and the “track–track” MPBs intersect to form acute angles with each other. The microstructure of MPBs exhibits a coarse grain zone near the MPBs and the characteristics of segregation of nonmetallic elements (O, Si) where the crack easily happened. The DA value (−2 to 2 mm) affected both the density and the tensile mechanical properties. High tensile strength (456 ± 14 MPa) and good tensile ductility (9.5 ± 1.4%) were achieved in the as-printed condition corresponding to DA = 0.5 mm. The tensile fracture surface features were analyzed and correlated to the influence of the DA values. View Full-Text
Keywords: aluminum alloys; selective laser melting (SLM); mechanical properties aluminum alloys; selective laser melting (SLM); mechanical properties
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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
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MDPI and ACS Style

Zhou, S.; Su, Y.; Gu, R.; Wang, Z.; Zhou, Y.; Ma, Q.; Yan, M. Impacts of Defocusing Amount and Molten Pool Boundaries on Mechanical Properties and Microstructure of Selective Laser Melted AlSi10Mg. Materials 2019, 12, 73. https://doi.org/10.3390/ma12010073

AMA Style

Zhou S, Su Y, Gu R, Wang Z, Zhou Y, Ma Q, Yan M. Impacts of Defocusing Amount and Molten Pool Boundaries on Mechanical Properties and Microstructure of Selective Laser Melted AlSi10Mg. Materials. 2019; 12(1):73. https://doi.org/10.3390/ma12010073

Chicago/Turabian Style

Zhou, Suyuan, Yang Su, Rui Gu, Zhenyu Wang, Yinghao Zhou, Qian Ma, and Ming Yan. 2019. "Impacts of Defocusing Amount and Molten Pool Boundaries on Mechanical Properties and Microstructure of Selective Laser Melted AlSi10Mg" Materials 12, no. 1: 73. https://doi.org/10.3390/ma12010073

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