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On the low strain rate regime of structural superplasticity - an internal variable approach SCIE SCOPUS

Title
On the low strain rate regime of structural superplasticity - an internal variable approach
Authors
Bang, WPark, JEKwon, YNLee, CSChang, YW
Date Issued
2005-01
Publisher
TRANS TECH PUB LTD
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.
Keywords
superplasticity; grain boundary sliding; internal variable theory, and threshold stress
URI
https://oasis.postech.ac.kr/handle/2014.oak/33686
DOI
10.4028/www.scientific.net/MSF.475-479.3007
ISSN
0255-5476
Article Type
Article
Citation
MATERIALS SCIENCE FORUM, vol. 475-479, page. 3007 - 3011, 2005-01
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