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http://dx.doi.org/10.4150/KPMI.2012.19.3.204

Ultrafine Grained Cu-diamond Composites using High Pressure Torsion  

Yoon, Eun-Yoo (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH))
Lee, Dong-Jun (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH))
Kim, Taek-Soo (Department of Rare Metals, Korea Institute of Industrial Technology (KITECH))
Kim, Hyoung-Seop (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH))
Publication Information
Journal of Powder Materials / v.19, no.3, 2012 , pp. 204-209 More about this Journal
Abstract
In this work, powder metallurgy and severe plastic deformation by high-pressure torsion (HPT) approaches were combined to achieve both full density and grain refinement at the same time. Pure Cu powders were mixed with 5 and 10 vol% diamonds and consolidated into disc-shaped samples at room temperature by HPT at 1.25 GPa and 1 turn, resulting in ultrafine grained metallic matrices embedded with diamonds. Neither heating nor additional sintering was required with the HPT process so that in situ consolidation was successfully achieved at ambient temperature. Significantly refined grain structures of Cu metallic matrices with increasing diamond volume fractions were observed by electron backscatter diffraction (EBSD), which enhanced the microhardness of the Cu-diamond composites.
Keywords
High pressure torsion; Copper; Diamond; Ultrafine grain; Nanocomposite;
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