Ring-Constraint High-Pressure Torsion Process
SCIE
SCOPUS
- Title
- Ring-Constraint High-Pressure Torsion Process
- Authors
- Joo, SH; Kim, HS
- Date Issued
- 2016-07
- Publisher
- SPRINGER
- 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 (similar to 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/36976
- DOI
- 10.1007/s11661-016-3518-3
- ISSN
- 1073-5623
- Article Type
- Article
- Citation
- METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 47A, no. 7, page. 3473 - 3478, 2016-07
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