Achieving both powder consolidation and grain refinement for bulk nanostructured materials by equal-channel angular pressing

Seung Chae Yoon, Do Minh Nghiep, Sun Ig Hong, Zenji Horita, Hyoung Seop Kim

Research output: Contribution to journalArticle

Abstract

Manufacturing bulk nanostructured materials with least grain growth from initial powders is challenging because of the bottle neck of bottom-up methods using the conventional powder metallurgy of compaction and sintering. In this study, bottom-up type powder metallurgy 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. ECAP (Equal-Channel Angular Pressing), one of the most promising processes in SPD, was used for the powder consolidation method. For understanding the ECAP process, investigating the powder density as well as internal stress, strain and strain rate distribution is crucial. We investigated the consolidation and plastic deformation of the metallic powders during ECAP using the finite element simulations. Almost independent behavior of powder densification in the entry channel and shear deformation in the main deformation zone was found by the finite element method in conjunction with a pressure dependent material yield model. Effects of processing parameters on densification and density distributions were investigated.

Original languageEnglish
Pages (from-to)173-176
Number of pages4
JournalKey Engineering Materials
Volume345-346 I
Publication statusPublished - May 21 2007

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Equal channel angular pressing
Grain refinement
Nanostructured materials
Consolidation
Powders
Plastic deformation
Powder metallurgy
Densification
Bottles
Processing
Grain growth
Shear deformation
Strain rate
Residual stresses
Compaction
Sintering
Finite element method

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Achieving both powder consolidation and grain refinement for bulk nanostructured materials by equal-channel angular pressing. / Yoon, Seung Chae; Nghiep, Do Minh; Hong, Sun Ig; Horita, Zenji; Kim, Hyoung Seop.

In: Key Engineering Materials, Vol. 345-346 I, 21.05.2007, p. 173-176.

Research output: Contribution to journalArticle

Yoon, Seung Chae ; Nghiep, Do Minh ; Hong, Sun Ig ; Horita, Zenji ; Kim, Hyoung Seop. / Achieving both powder consolidation and grain refinement for bulk nanostructured materials by equal-channel angular pressing. In: Key Engineering Materials. 2007 ; Vol. 345-346 I. pp. 173-176.
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