On the creep transition from superplastic behavior to nanocrystalline behavior

About the author

Professor Farghalli A. Mohamed (FAM) received his undergraduate training in Metallurgical Engineering from Cairo University, Egypt, in1965. He received his graduate training (M.S. degree in 1970 and Ph.D. degree in 1972) from the University of California, Berkeley. At present, he is Professor Emeritus in the Department of Chemical Engineering and Materials Science at the University of California, Irvine. 

FAM’s research involves mechanical behavior of engineering materials (metals, alloys, composites, ceramics, nanocrystalline materials); correlation between behavior and microstructure; creep; superplasticity; and strengthening and fracture mechanisms. Recent published research has focused on the role of impurities during superplastic deformation and cavitation, dynamic recrystallization; creep in nanocrystalline materials, deformation mechanisms in nanocrystalline materials, nanoscale softening, and modeling. FAM has authored or co-authored over 200 publications in the area of mechanical properties.  Since 2002, FAM has been recognized by the Institute for Scientific Research as one of the most highly cited, influential researchers in the field of Materials Science and Engineering.   

Journal Reference

Materials Science and Engineering: A, Volume 655, 2016, Pages 396–398. 

Farghalli A. Mohamed

Department of Chemical Engineering and Materials Science, University of California, Irvine, CA 92697, USA

Abstract

The present analysis shows that the creep transition from superplastic behavior to nanocrystalline behavior can be defined by an expression, which relates the normalized grain size, d/b (b is the Burgers vector) to the normalized shear stress, τ/G (G is the shear modulus).

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