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Dynamic High Pressure Torsion (DHPT) : a novel method for high strain rate severe plastic deformation

Harishchandra Lanjewar (UGent) , Leo Kestens (UGent) and Patricia Verleysen (UGent)
(2018) PROCEEDINGS. 2(8).
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Abstract
Metals with a fine-grained microstructure have exceptional mechanical properties. Severe plastic deformation (SPD) is one of the most successful ways to fabricate ultrafine-grained (UFG) and nanostructured (NC) materials. Most of the SPD techniques employ very low processing speeds. However, the lowest steady-state grain size which can be obtained by SPD is considered to be inversely proportional with the strain rate at which the severe deformation is imposed. In order to overcome this limitation, methods operating at higher rates have been envisaged and used to study the fragmentation process and the properties of the obtained materials. However, almost none of these methods, employ hydrostatic pressures which are needed to prevent the material from failing at high deformation strains. As such, their applicability is limited to materials with a high intrinsic ductility. Additionally, in some methods the microstructural changes are limited to the surface layers of the material. To circumvent these restrictions, a novel facility has been designed and developed which deforms the material at high strain rate under high hydrostatic pressures. Using the facility, commercially pure aluminum was processed and analysis of the deformed material was performed. The microstructure evolution in this material was compared with that observed in static high pressure torsion (HPT) processed material.
Keywords
dynamic high pressure torsion, severe plastic deformation, microstructure

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Citation

Please use this url to cite or link to this publication:

Chicago
Lanjewar, Harishchandra, Leo Kestens, and Patricia Verleysen. 2018. “Dynamic High Pressure Torsion (DHPT) : a Novel Method for High Strain Rate Severe Plastic Deformation.” Proceedings 2 (8).
APA
Lanjewar, H., Kestens, L., & Verleysen, P. (2018). Dynamic High Pressure Torsion (DHPT) : a novel method for high strain rate severe plastic deformation. PROCEEDINGS, 2(8).
Vancouver
1.
Lanjewar H, Kestens L, Verleysen P. Dynamic High Pressure Torsion (DHPT) : a novel method for high strain rate severe plastic deformation. PROCEEDINGS. MDPI; 2018;2(8).
MLA
Lanjewar, Harishchandra, Leo Kestens, and Patricia Verleysen. “Dynamic High Pressure Torsion (DHPT) : a Novel Method for High Strain Rate Severe Plastic Deformation.” PROCEEDINGS 2.8 (2018): n. pag. Print.
@article{8573793,
  abstract     = {Metals with a fine-grained microstructure have exceptional mechanical properties. Severe
plastic deformation (SPD) is one of the most successful ways to fabricate ultrafine-grained (UFG)
and nanostructured (NC) materials. Most of the SPD techniques employ very low processing
speeds. However, the lowest steady-state grain size which can be obtained by SPD is considered to
be inversely proportional with the strain rate at which the severe deformation is imposed. In order
to overcome this limitation, methods operating at higher rates have been envisaged and used to
study the fragmentation process and the properties of the obtained materials. However, almost none
of these methods, employ hydrostatic pressures which are needed to prevent the material from
failing at high deformation strains. As such, their applicability is limited to materials with a high
intrinsic ductility. Additionally, in some methods the microstructural changes are limited to the
surface layers of the material. To circumvent these restrictions, a novel facility has been designed
and developed which deforms the material at high strain rate under high hydrostatic pressures.
Using the facility, commercially pure aluminum was processed and analysis of the deformed
material was performed. The microstructure evolution in this material was compared with that
observed in static high pressure torsion (HPT) processed material.},
  articleno    = {493},
  author       = {Lanjewar, Harishchandra and Kestens, Leo and Verleysen, Patricia},
  issn         = {2504-3900},
  journal      = {PROCEEDINGS},
  language     = {eng},
  number       = {8},
  publisher    = {MDPI},
  title        = {Dynamic High Pressure Torsion (DHPT) : a novel method for high strain rate severe plastic deformation},
  url          = {http://dx.doi.org/10.3390/icem18-05399},
  volume       = {2},
  year         = {2018},
}

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