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http://dx.doi.org/10.4150/KPMI.2014.21.1.44

Manufacturing and Evaluation of Properties of Nanocrystalline Ni bulk by Dynamic Compaction of Nano Ni powders using a Gas-gun System  

Kim, Wooyeol (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH))
Ahn, Dong-Hyun (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH))
Park, Lee Ju (4th Agenda Research Division, Agency for Defense Development)
Park, Jong-Il (ES Materials Center, Research Institute of Industrial Science & Technology (RIST))
Kim, Hyoung Seop (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH))
Publication Information
Journal of Powder Materials / v.21, no.1, 2014 , pp. 44-49 More about this Journal
Abstract
In this study, nanocrystalline nickel powders were cold compacted by a dynamic compaction method using a single-stage gas gun system. A bending test was conducted to measure the bonding strengths of the compacted regions and microstructures of the specimen were analyzed using a scanning electron microscopy. The specimen was separated into two parts by a horizontal crack after compaction. Density test shows that the powder compaction occurred only in the upper part of the specimen. Brittle fracture was occurred during the bending test of the compact sample. Dispersion of shock energy due to spalling highly affected the bonding status of the nanocrystalline nickel powder.
Keywords
Nanocrystalline nickel powder; Gas gun system; Density; Bending test;
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