Paper Title:
Application of High Pressure Torsion to Bulk Samples
  Abstract

High pressure torsion (HPT) is a well-known procedure to impart severe plastic deformation (SPD) into metallic materials. It was reported that HPT produces grain sizes finer than those using other SPD processes such as equal-channel angular pressing (ECAP). However, the application of HPT has been restricted to thin disk samples. In this study, an HPT process was developed for use with bulk samples. This process is designated as Bulk-HPT for comparison with conventional Disk-HPT. Cylindrical samples of an Al-3%Mg-0.2%Sc alloy having dimensions of 10 mm in diameter and 8.6 mm in height were prepared for Bulk-HPT. The samples were strained under a pressure of 1 GPa for 2 turns at room temperature. Microstructural observations revealed that the samples contained regions having a grain size of ~130 nm. Tensile testing showed a superplastic ductility ~480 % at 673 K with an initial strain rate of 3.3x10-2 s-1.

  Info
Periodical
Materials Science Forum (Volumes 503-504)
Edited by
Zenji Horita
Pages
391-398
DOI
10.4028/www.scientific.net/MSF.503-504.391
Citation
G. Sakai, K. Nakamura, Z. Horita, T. G. Langdon, "Application of High Pressure Torsion to Bulk Samples", Materials Science Forum, Vols. 503-504, pp. 391-398, 2006
Online since
January 2006
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$32.00
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