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S. Floreen

Bio: S. Floreen is an academic researcher. The author has contributed to research in topics: Creep & Superplasticity. The author has an hindex of 1, co-authored 1 publications receiving 117 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors considered various deformation mechanisms for superplastic deformation and showed that grain boundary sliding is the major deformation mode, but the sliding rate should be governed by the lesser rate of dislocation creep within the grains.
Abstract: Under various conditions of stress and temperature various deformation mechanisms could be rate-controlling for superplastic deformation. In general at low stresses diffusion creep should be rate-controlling. At temperatures between approximately 40 and 65 pct of the absolute melting point grain boundary diffusion should be the dominant diffusion path while at higher temperatures volume diffusion should dominate. At intermediate stresses, grain boundary sliding should be the major deformation mode, but the sliding rate should be governed by the lesser rate of dislocation creep within the grains. At temperatures between 40 and 65 pct of the melting point, the rate of dislocation creep should be controlled by dislocation pipe diffusion, while at higher temperatures volume diffusion should be ratecontrolling. At high stresses the superplastic effect of unusually large tensile extensibility should diminish due to the greater possibility of work-hardening processes such as dislocation cell, tangle, and pile-up formation.

120 citations


Cited by
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Journal ArticleDOI
01 Dec 1972
TL;DR: The effect of interfaces on mechanical properties is considered in this paper, with emphasis on dislocation mechanisms and the atomic scale structure of boundaries, and Elastic and plastic compatibilities at boundaries are treated.
Abstract: The effect of interfaces on mechanical properties is considered. Elastic and plastic compatibilities at boundaries are treated. Specific influences at both low and high temperatures are discussed, with emphasis on dislocation mechanisms and the atomic scale structure of boundaries.

562 citations

Journal ArticleDOI
TL;DR: Superplasticity in fine-grained materials is characterized by extensive grain boundary sliding as discussed by the authors, and it can take place only in special conditions, and six criteria are defined to determine when superplasticy has been active.
Abstract: Superplasticity in fine-grained materials is characterized by extensive grain boundary sliding. This phenomenon can take place only in special conditions. Six criteria are thus defined to determine when Superplasticity has been active. Applications of these criteria to several examples of mylonites are discussed and we conclude that superplasticity explains some types of mylonites and the tectonic banding that they exhibit.

266 citations

Journal ArticleDOI
TL;DR: A sigmoidal relationship between strain rate and stress was observed in a superplastic Zn-22% Al eutectoid alloy with grain sizes in the range of 2.1-7.5 μm.

160 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of grain boundary sliding (GBS) on the nature of deformation maps for aluminum and nickel is considered, and it is shown that large portions of such deformation map are dominated by GBS.

158 citations