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Metals 2016, 6(10), 241; doi:10.3390/met6100241

Similarities and Differences in Mechanical Alloying Processes of V-Si-B and Mo-Si-B Powders

Institute of Materials and Joining Technology, Otto von Guericke University Magdeburg, P.O. Box 4120, Magdeburg 39016, Germany
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Author to whom correspondence should be addressed.
Academic Editor: Chun-Liang Chen
Received: 31 August 2016 / Revised: 29 September 2016 / Accepted: 8 October 2016 / Published: 14 October 2016
(This article belongs to the Special Issue Mechanical Alloying)
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Abstract

V-Si-B and Mo-Si-B alloys are currently the focus of materials research due to their excellent high temperature capabilities. To optimize the mechanical alloying (MA) process for these materials, we compare microstructures, morphology and particles size as well as hardness evolution during the milling process for the model alloys V-9Si-13B and Mo-9Si-8B. A variation of the rotational speed of the planetary ball mill and the type of grinding materials is therefore investigated. These modifications result in different impact energies during ball-powder-wall collisions, which are quantitatively described in this comparative study. Processing with tungsten carbide vials and balls provides slightly improved impact energies compared to vials and balls made of steel. However, contamination of the mechanically alloyed powders with flaked particles of tungsten carbide is unavoidable. In the case of using steel grinding materials, Fe contaminations are also detectable, which are solved in the V and Mo solid solution phases, respectively. Typical mechanisms that occur during the MA process such as fracturing and comminution are analyzed using the comminution rate KP. In both alloys, the welding processes are more pronounced compared to the fracturing processes. View Full-Text
Keywords: Mo-Si-B; V-Si-B; mechanical alloying; process optimization; impact energy; microstructure; microhardness Mo-Si-B; V-Si-B; mechanical alloying; process optimization; impact energy; microstructure; microhardness
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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

Krüger, M.; Schmelzer, J.; Helmecke, M. Similarities and Differences in Mechanical Alloying Processes of V-Si-B and Mo-Si-B Powders. Metals 2016, 6, 241.

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