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Article

Effect of Short Attritor-Milling of Magnesium Alloy Powder Prior to Spark Plasma Sintering

1
Faculty of Mathematics and Physics, Charles University, 121 16 Prague, Czech Republic
2
Nuclear Physics Institute CAS, Řež 130, 25068 Řež, Czech Republic
3
Institute of Plasma Physics CAS, Za Slovankou 3, 182 00 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Materials 2020, 13(18), 3973; https://doi.org/10.3390/ma13183973
Received: 21 August 2020 / Revised: 1 September 2020 / Accepted: 4 September 2020 / Published: 8 September 2020
(This article belongs to the Special Issue Advances in Sintering of Ores, Metallic Powders, and Ceramics)
The spark plasma sintering (SPS) technique was employed to prepare compacts from (i) gas-atomized and (ii) attritor-milled AE42 magnesium powder. Short attritor-milling was used mainly to disrupt the MgO shell covering the powder particles and, in turn, to enhance consolidation during sintering. Compacts prepared by SPS from the milled powder featured finer microstructures than compacts consolidated from gas-atomized powder (i.e., without milling), regardless of the sintering temperatures in the range of 400–550 °C. Furthermore, the grain growth associated with the increase in the sintering temperature in these samples was less pronounced than in the samples prepared from gas-atomized particles. Consequently, the mechanical properties were significantly enhanced in the material made of milled powder. Apart from grain refinement, the improvements in mechanical performance were attributed to the synergic effect of the irregular shape of the milled particles and better consolidation due to effectively disrupted MgO shells, thus suppressing the crack formation and propagation during loading. These results suggest that relatively short milling of magnesium alloy powder can be effectively used to achieve superior mechanical properties during consolidation by SPS even at relatively low temperatures. View Full-Text
Keywords: magnesium; powder; spark plasma sintering; milling; mechanical properties; microstructure magnesium; powder; spark plasma sintering; milling; mechanical properties; microstructure
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MDPI and ACS Style

Minárik, P.; Zemková, M.; Knapek, M.; Šašek, S.; Dittrich, J.; Lukáč, F.; Kozlík, J.; Král, R. Effect of Short Attritor-Milling of Magnesium Alloy Powder Prior to Spark Plasma Sintering. Materials 2020, 13, 3973. https://doi.org/10.3390/ma13183973

AMA Style

Minárik P, Zemková M, Knapek M, Šašek S, Dittrich J, Lukáč F, Kozlík J, Král R. Effect of Short Attritor-Milling of Magnesium Alloy Powder Prior to Spark Plasma Sintering. Materials. 2020; 13(18):3973. https://doi.org/10.3390/ma13183973

Chicago/Turabian Style

Minárik, Peter, Mária Zemková, Michal Knapek, Stanislav Šašek, Jan Dittrich, František Lukáč, Jiří Kozlík, and Robert Král. 2020. "Effect of Short Attritor-Milling of Magnesium Alloy Powder Prior to Spark Plasma Sintering" Materials 13, no. 18: 3973. https://doi.org/10.3390/ma13183973

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