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Open AccessArticle

Characterization of Composite Powder Feedstock from Powder Bed Fusion Additive Manufacturing Perspective

Department of Mechanical Engineering, McMaster University, Hamilton, ON L8S 4L7, Canada
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Materials 2019, 12(22), 3673; https://doi.org/10.3390/ma12223673
Received: 18 October 2019 / Revised: 5 November 2019 / Accepted: 5 November 2019 / Published: 7 November 2019
(This article belongs to the Collection Additive Manufacturing: Alloy Design and Process Innovations)
This research aims at evaluating the characteristics of the 5 wt.% B4C/Ti-6Al-4V composite powder feedstock prepared by two different categories of mechanical mixing for powder bed fusion (PBF) additive manufacturing (AM) of metal matrix composites (MMCs). Microstructural features, particle size, size distribution, sphericity, conditioned bulk density and flow behavior of the developed powders were examined. The flowability of the regularly mixed powders was significantly lower than that of the Ti-6Al-4V powder. However, the flowability of the ball-milled systems was a significant function of the milling time. The decrease in the flowability of the 2 h ball-milled powder compared to the Ti-6Al-4V powder was attributed to the mechanical interlocking and the entangling caused by the B4C particles fully decorating the Ti-6Al-4V particles. Although the flattened/irregular shape of powder particles in the 6 h milled system acted to reduce the flowability, the overall surface area reduction led to higher flowability than that for the 2 h milling case. Regardless of the mixing method, incorporation of B4C particles into the system decreased the apparent density of the Ti-6Al-4V powder. The composite powder obtained by 2 h of ball milling was suggested as the best possible condition, meeting the requirements of PBF–AM processes. View Full-Text
Keywords: additive manufacturing; powder bed fusion; selective laser melting; regular mixing; ball milling; flowability; Ti-6Al-4V additive manufacturing; powder bed fusion; selective laser melting; regular mixing; ball milling; flowability; Ti-6Al-4V
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MDPI and ACS Style

Fereiduni, E.; Ghasemi, A.; Elbestawi, M. Characterization of Composite Powder Feedstock from Powder Bed Fusion Additive Manufacturing Perspective. Materials 2019, 12, 3673.

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