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Open AccessFeature PaperArticle

Fabrication of Metal Matrix Composite by Laser Metal Deposition—A New Process Approach by Direct Dry Injection of Nanopowders

Empa–Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Advanced Materials Processing, 3602 Thun, Switzerland
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Materials 2019, 12(21), 3584; https://doi.org/10.3390/ma12213584
Received: 30 September 2019 / Revised: 23 October 2019 / Accepted: 28 October 2019 / Published: 31 October 2019
(This article belongs to the Special Issue Metal Matrix Composites: Experimental and Simulation)
Laser Metal Deposition (LMD) offers new perspectives for the fabrication of metal matrix nanocomposites (MMnCs). Current methods to produce MMnCs by LMD systematically involve the premixing of the nanopowders and the micropowders or require in-situ strategies, thereby restricting the possibilities to adjust the nature, content and location of the nano-reinforcement during printing. The objective of this study is to overcome such restrictions and propose a new process approach by direct injection of nanoparticles into a metallic matrix. Alumina (n-Al2O3) nanoparticles were introduced into a titanium matrix by using two different direct dry injection modes in order to locally increase the hardness. Energy dispersive X-ray spectroscopy (EDS) analyses validate the successful incorporation of the n-Al2O3 at chosen locations. Optical and high resolution transmission electron microscopic (HR-TEM) observations as well as X-ray diffraction (XRD) analyses indicate that n-Al2O3 powders are partly or totally dissolved into the Ti melted pool leading to the in-situ formation of a composite consisting of fine α2 lamellar microstructure within a Ti matrix and a solid solution with oxygen. Mechanical tests show a significant increase in hardness with the increase of injected n-Al2O3 amount. A maximum of 620 HV was measured that is almost 4 times higher than the pure LMD-printed Ti structure. View Full-Text
Keywords: laser metal deposition; direct nanopowder injection; metal matrix composite; lamellar microstructure; titanium aluminide; solid solution; hardness laser metal deposition; direct nanopowder injection; metal matrix composite; lamellar microstructure; titanium aluminide; solid solution; hardness
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MDPI and ACS Style

Lanfant, B.; Bär, F.; Mohanta, A.; Leparoux, M. Fabrication of Metal Matrix Composite by Laser Metal Deposition—A New Process Approach by Direct Dry Injection of Nanopowders. Materials 2019, 12, 3584. https://doi.org/10.3390/ma12213584

AMA Style

Lanfant B, Bär F, Mohanta A, Leparoux M. Fabrication of Metal Matrix Composite by Laser Metal Deposition—A New Process Approach by Direct Dry Injection of Nanopowders. Materials. 2019; 12(21):3584. https://doi.org/10.3390/ma12213584

Chicago/Turabian Style

Lanfant, Briac; Bär, Florian; Mohanta, Antaryami; Leparoux, Marc. 2019. "Fabrication of Metal Matrix Composite by Laser Metal Deposition—A New Process Approach by Direct Dry Injection of Nanopowders" Materials 12, no. 21: 3584. https://doi.org/10.3390/ma12213584

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