Paper Title:
On the Low Strain Rate Regime of Structural Superplasticity - an Internal Variable Approach
  Abstract

The superplastic deformation behavior of a fine-grained 7075 Al has been investigated to clarify the issue of threshold stress. A series of mechanical tests has been conducted at various temperatures for the specimens with various grain sizes. The quantitative constitutive parameters have been determined from load relaxation test by applying the internal variable theory of structural superplaticity (SSP) proposed by Chang et al. The GBS flow could be formulated as a viscosity-type equation, characterized by the Newtonian exponent of 1.0. The unresolved issue of threshold stress is clarified and identified as a critical stress required for the GBS. The micro-mechanical roll of grain size refinement has also been manifested in terms of proposed constitutive parameters.

  Info
Periodical
Materials Science Forum (Volumes 475-479)
Main Theme
Edited by
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
Pages
3007-3012
DOI
10.4028/www.scientific.net/MSF.475-479.3007
Citation
W. K. Bang, J.E. Park, Y. N. Kwon, C. S. Lee, Y. W. Chang, "On the Low Strain Rate Regime of Structural Superplasticity - an Internal Variable Approach", Materials Science Forum, Vols. 475-479, pp. 3007-3012, 2005
Online since
January 2005
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$32.00
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