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http://dx.doi.org/10.7234/composres.2019.32.3.141

Cold Compaction Behavior of Nano and Micro Aluminum Powder under High Pressure  

Kim, Dasom (Department of Materials System Engineering, Pukyong National University)
Park, Kwangjae (Department of Materials System Engineering, Pukyong National University)
Kim, Kyungju (The International Science Technology Research Center, Pukyong National University)
Cho, Seungchan (Department of Composites Research, Korea Institute of Materials Science)
Hirayama, Yusuke (Magnetic Powder Metallurgy Research Center, National Institute of Advanced Industrial Science and Technology (AIST))
Takagi, Kenta (Magnetic Powder Metallurgy Research Center, National Institute of Advanced Industrial Science and Technology (AIST))
Kwon, Hansang (Department of Materials System Engineering, Pukyong National University)
Publication Information
Composites Research / v.32, no.3, 2019 , pp. 141-147 More about this Journal
Abstract
In this study, micro-sized and nano-sized pure aluminum (Al) powders were compressed by unidirectional pressure at room temperature. Although neither type of Al bulk was heated, they had a high relative density and improved mechanical properties. The microstructural analysis showed a difference in the process of densification according to particle size, and the mechanical properties were measured by the Vickers hardness test and the nano indentation test. The Vickers hardness of micro Al and nano Al fabricated in this study was five to eight times that of ordinary Al. The grain refinement effect was considered to be one of the strengthening factors, and the Hall-Petch equation was introduced to analyze the improved hardness caused by grain size reduction. In addition, the effect of particle size and dispersion of aluminum oxide in the bulk were additionally considered. Based on these results, the present study facilitates the examination of the effect of particle size on the mechanical properties of compacted bulk fabricated by the powder metallurgy method and suggests the possible way to improve the mechanical properties of nano-crystalline powders.
Keywords
Aluminum; Powder metallurgy; Nanocrystalline material; Hall-Petch equation; Oxide dispersion strengthening;
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