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Investigation of Porosity and Mechanical Properties of Graphene Nanoplatelets-Reinforced AlSi10 Mg by Selective Laser Melting

[+] Author and Article Information
Yachao Wang, Jing Shi

Department of Mechanical and
Materials Engineering,
College of Engineering and Applied Science,
University of Cincinnati,
Cincinnati, OH 45221

Shiqiang Lu

School of Aeronautical Manufacturing
Engineering,
Nanchang Hangkong University,
Nanchang 330063, Jiangxi, China

Weihan Xiao

School of Material Science and Engineering,
Nanchang Hangkong University,
Nanchang 330063, Jiangxi, China

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MICRO- AND NANO-MANUFACTURING. Manuscript received June 15, 2017; final manuscript received October 20, 2017; published online December 14, 2017. Assoc. Editor: Yayue Pan.

J. Micro Nano-Manuf 6(1), 010902 (Dec 14, 2017) (7 pages) Paper No: JMNM-17-1032; doi: 10.1115/1.4038454 History: Received June 15, 2017; Revised October 20, 2017

Graphene possesses many outstanding properties, such as high strength and light weight, making it an ideal reinforcement for metal matrix composite (MMCs). Meanwhile, fabricating MMCs through laser-assisted additive manufacturing (LAAM) has attracted much attention in recent years due to the advantages of low waste, high precision, short production lead time, and high flexibility. In this study, graphene-reinforced aluminum alloy AlSi10 Mg is fabricated using selective laser melting (SLM), a typical LAAM technique. Composite powders are prepared using high-energy ball milling. Room temperature tensile tests are conducted to evaluate the mechanical properties. Scanning electron microscopy observations are conducted to investigate the microstructure and fracture surface of obtain composite. It is found that adding graphene nanoplatelets (GNPs) significantly increases porosity, which offsets the enhancement of tensile performance as a result of GNPs addition. Decoupling effort is then made to separate the potential beneficial effects from GNPs addition and the detrimental effect from porosity increase. For this purpose, the quantitative relationship between porosity and material strength is obtained. Taking into consideration the strength reduction caused by the increased porosity, the strengthening effect of GNPs turns out to be significant, which reaches 60.2 MPa.

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References

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Figures

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Fig. 1

AlSi10 Mg powders mixed with 0.5 wt % graphene

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Fig. 2

Dimension of tensile test specimens

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Fig. 3

Schematic of building strategy

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Fig. 4

As-built tensile specimens

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Fig. 5

Optical micrographs of (a) unreinforced AlSi10 Mg and (b) GNPs-reinforced AlSi10 Mg at as-built condition

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Fig. 6

Tensile performance of unreinforced and GNPs-reinforced AlSi10 Mg

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Fig. 7

Scanning electron microscopy fractographs of (a) unreinforced AlSi10 Mg and (b) GNPs-reinforced AlSi10 Mg

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Fig. 8

Micrographs of pores in the as-built samples, with dark color indicating pores: (a) unreinforced AlSi10 Mg and (b) GNPs-reinforced AlSi10 Mg

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Fig. 9

Porosity comparison between unreinforced and GNPs-reinforced AlSi10 Mg

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Fig. 10

Porosity size distributions for (a) unreinforced and (b) GNPs-reinforced AlSi10 Mg

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Fig. 11

Relative strength with respect to porosity for SLM-produced AlSi10 Mg

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