Paper Title:
Athermal and Thermal Limits of the Grain Refinement by SPD
  Abstract

Severe plastic deformation, SPD, enables the grain refinement of bulk materials. However, at strains larger than a critical value, no further microstructural refinement can be observed. This regime is denoted as saturation region of the microstructural size. It will be shown that this regime can be divided into a thermal and an athermal part. The transition between these two regimes was examined in an Al-3wt.%Mg alloy. The single phase alloy was deformed by high pressure torsion (HPT) at various temperatures and different rotational speeds. During the HPTdeformation the flow stress was measured by a torque cell in a temperature range between -196°C (evaporation temperature of the liquid nitrogen) and 450°C. The temperature and the strain rate dependent behavior reveal a shift of the onset of the thermal activated regime towards higher temperatures by an increase of the strain rate.

  Info
Periodical
Materials Science Forum (Volumes 584-586)
Edited by
Yuri Estrin and Hans Jürgen Maier
Pages
938-943
DOI
10.4028/www.scientific.net/MSF.584-586.938
Citation
M. Hafok, R. Pippan, "Athermal and Thermal Limits of the Grain Refinement by SPD", Materials Science Forum, Vols. 584-586, pp. 938-943, 2008
Online since
June 2008
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$32.00
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