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http://dx.doi.org/10.4150/KPMI.2015.22.1.6

Analyses of Densification and Consolidation of Copper Powders during High-Pressure Torsion Process Using Finite Element Method  

Lee, Dong Jun (Materials Deformation Team, Process Commercialization Center, Korea Institute of Materials Science(KIMS))
Yoon, Eun Yoo (Materials Deformation Team, Process Commercialization Center, Korea Institute of Materials Science(KIMS))
Publication Information
Journal of Powder Materials / v.22, no.1, 2015 , pp. 6-9 More about this Journal
Abstract
In this study, the behavior of densification of copper powders during high-pressure torsion (HPT) at room temperature is investigated using the finite element method. The simulation results show that the center of the workpiece is the first to reach the true density of copper during the compressive stage because the pressure is higher at the center than the periphery. Subsequently, whole workpiece reaches true density after compression due to the high pressure. In addition, the effective strain is increased along the radius during torsional stage. After one rotation, the periphery shows that the effective strain is increased up to 25, which is extensive deformation. These high pressure and severe strain do not only play a key role in consolidation of copper powders but also make the matrix harder by grain refinement.
Keywords
High-pressure torsion (HPT); Severe plastic deformation (SPD); Densification behavior; Finite element method;
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