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Materials 2016, 9(5), 391; doi:10.3390/ma9050391

The Structure and Mechanical Properties of High-Strength Bulk Ultrafine-Grained Cobalt Prepared Using High-Energy Ball Milling in Combination with Spark Plasma Sintering

1
Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic
2
Institute of Plasma Physics AS CR, v.v.i., Za Slovankou 1782/3, 182 00 Prague 8, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Jai-Sung Lee
Received: 8 March 2016 / Revised: 29 April 2016 / Accepted: 13 May 2016 / Published: 19 May 2016
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Abstract

In this study, bulk ultrafine-grained and micro-crystalline cobalt was prepared using a combination of high-energy ball milling and subsequent spark plasma sintering. The average grain sizes of the ultrafine-grained and micro-crystalline materials were 200 nm and 1 μm, respectively. Mechanical properties such as the compressive yield strength, the ultimate compressive strength, the maximum compressive deformation and the Vickers hardness were studied and compared with those of a coarse-grained as-cast cobalt reference sample. The bulk ultrafine-grained sample showed an ultra-high compressive yield strength that was greater than 1 GPa, which is discussed with respect to the preparation technique and a structural investigation. View Full-Text
Keywords: ultrafine-grained material; cobalt; ball milling; spark plasma sintering; mechanical properties ultrafine-grained material; cobalt; ball milling; spark plasma sintering; mechanical properties
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Marek, I.; Vojtěch, D.; Michalcová, A.; Kubatík, T.F. The Structure and Mechanical Properties of High-Strength Bulk Ultrafine-Grained Cobalt Prepared Using High-Energy Ball Milling in Combination with Spark Plasma Sintering. Materials 2016, 9, 391.

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