Densification and Conolidation of Powders by Equal Channel Angular Pressing

Seung Chae Yoon; Sun Ig Hong; Soon Hyung Hong; Hyoung Seop Kim

doi:10.4028/www.scientific.net/MSF.534-536.253

Paper Titles

Analysis of Failure Mechanisms during Powder Compaction
p.237

Anisotropy of Thermal Expansion Coefficient of Pressed Graphite Foam Measured over the Temperature Interval 20-500°C
p.241

Carbon Nanotube Reinforced Metal Matrix Nanocomposites via Equal Channel Angular Pressing
p.245

Compaction of Ultra-Fine WC Powder by High-Speed Centrifugal Compaction Process
p.249

Densification and Conolidation of Powders by Equal Channel Angular Pressing
p.253

Densification Behavior of Iron Powder during Cold Stepped Compaction
p.257

Densification Mechanism of Warm Compaction for Iron-Based Powder Materials
p.261

Development of High Strength Sintered Steel by High Pressure Warm Compaction Using Die Wall Lubrication
p.265

Development of Optical Device Housing Compacted Using SUS304L Granulated Powders
p.269

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Densification and Conolidation of Powders by Equal Channel Angular Pressing

Abstract:

In this study, bottom-up type powder processing and top-down type SPD (severe plastic deformation) approaches were combined in order to achieve both full density and grain refinement of metallic powders with least grain growth, which is considered as a bottle neck of the bottom-up method that uses the conventional powder metallurgy of compaction and sintering. ECAP (Equal channel angular pressing), one of the most promising method in SPD, was used for the powder consolidation. In the ECAP process of not only solid but also powder metals, it is important to get a good understanding of the density as well as internal stress, strain and strain rate distribution. We investigated the consolidation, plastic deformation and microstructure evolution behavior of the metallic powders during ECAP using an experimental method. It was found that high mechanical strength could be achieved effectively due to the well bonded powder contact surface during ECAP process of gas atomized Al-Si powders. The experimental results show that SPD processing of powders is a viable method to achieve both fully density and nanostructured materials.