Load relaxation behavior of superplastic Al alloys
SCIE
SCOPUS
- Title
- Load relaxation behavior of superplastic Al alloys
- Authors
- Ha, TK; Chang, YW
- Date Issued
- 1997-01
- Publisher
- TRANSTEC PUBLICATIONS LTD
- Abstract
- The high temperature deformation behavior of superplastic Al alloys, such as 8090 AI-Li and 7475 Al, has been studied experimentally within the framework of an internal variable theory of inelastic deformation. A simple rheological model including the grain boundary sliding (GBS) has been developed and used to interpret the plastic flow behavior of these alloys at high temperatures. A series of load relaxation tests has been carried out for fine grained specimens of superplastic Al alloys at various temperatures. The effect of grain size has also been examined. A Hall-Fetch type relation has been found between the grain size and an internal strength variable (sigma*), instead of generally used flow stress (sigma). Based on the experimental observation, a necessary condition for superplastic deformation has finally been proposed in terms of sigma* and the static friction stress for GBS (Sigma(g)) as Sigma(g) less than or equal to sigma less than or equal to sigma*.
- Keywords
- structural superplasticity; grain boundary sliding; Newtonian viscous flow; internal variables; load relaxation test; DEFORMATION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/21404
- DOI
- 10.4028/www.scientific.net/MSF.243-245.505
- ISSN
- 0255-5476
- Article Type
- Article
- Citation
- MATERIALS SCIENCE FORUM, vol. 243-245, page. 505 - 510, 1997-01
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