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- Title
Ring-Constraint High-Pressure Torsion Process.
- Authors
Joo, Soo-Hyun; Kim, Hyoung
- Abstract
In this study, a constraint ring around a workpiece was employed in order to develop back pressure in addition to a compressive die pressure in high-pressure torsion (HPT) process. The influence of the constraint ring during the HPT process was analyzed using the finite element method and experimental analyses. Greater back pressure was developed when a ring of a stronger material enveloped the workpiece. In the experiments, fracture of a brittle material [ e.g., La-based bulk metallic glass (BMG)], was limited even at large shear strain (~315) during the ring-constraint HPT (RC-HPT) process due to reduced tensile stress at the edge of the deforming BMG workpiece. Furthermore, the RC-HPT process had beneficial effects on powder consolidation and bonding. The RC-HPT process exhibited smaller loss of material than did the conventional semi-constrained HPT process. The Cu disk produced by the powder RC-HPT had smaller grain sizes because back pressure generated more dislocations and finer grain size in the Cu workpiece.
- Subjects
TORSION; BRITTLE materials; STRAINS &; stresses (Mechanics); FINITE element method; ELECTRIC properties of nanostructured materials; BRITTLE fractures
- Publication
Metallurgical & Materials Transactions. Part A, 2016, Vol 47, Issue 7, p3473
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-016-3518-3