1. Mohamed (FAM) Lab Mechanical Behavior of Engineering Materials famohame@uci.edu http://fam.eng.uci.edu Mohamed (FAM) Lab Mechanical Behavior of Engineering Materials famohame@uci.edu http://fam.eng.uci.edu Prof. Farghalli A Mohamed (FAM) Full Professor B.S. Cairo University Cairo, Egypt (1965) M.S. University of California Berkeley (1970) Ph.D. University of California Berkeley (1972) Prof. Farghalli A Mohamed (FAM) Full Professor B.S. Cairo University Cairo, Egypt (1965) M.S. University of California Berkeley (1970) Ph.D. University of California Berkeley (1972) Research Topics: Mechanical behavior of engineering materials (metals, alloys, composites, ceramics, nanocrystalline materials) Correlation between behavior and microstructure Creep and superplasticity The role of impurities during superplastic deformation and cavitation Dynamic recrystallization Deformation mechanisms in nanocrystalline materials, and nanoscale softening Modeling of deformation behavior Significance: Investigation of mechanical behavior of materials is vital for two primary reasons: a)It contributes to the understanding of deformation mechanisms that are operative under certain conditions of variables (stress, temperature, etc.) b)It leads to the development of reliable design criteria. Research Topics: Mechanical behavior of engineering materials (metals, alloys, composites, ceramics, nanocrystalline materials) Correlation between behavior and microstructure Creep and superplasticity The role of impurities during superplastic deformation and cavitation Dynamic recrystallization Deformation mechanisms in nanocrystalline materials, and nanoscale softening Modeling of deformation behavior Significance: Investigation of mechanical behavior of materials is vital for two primary reasons: a)It contributes to the understanding of deformation mechanisms that are operative under certain conditions of variables (stress, temperature, etc.) b)It leads to the development of reliable design criteria. Key Publications: F.A. Mohamed, “A dislocation model for the minimum grain size obtainable by milling,” Acta Materialia, 51,4107 (2003). Yuwei Xun and F.A. Mohamed, “Superplastic Behavior of Zn-22% Al containing nano-scale dispersion particles,” Acta Materialia, 52, 4401(2004). F. A. Mohamed, “Interpretation of nanoscale softening Ni in terms of dislocation accommodation boundary sliding,” Metallurgical and Materials Transactions A, 38A, 340 (2007). Y. Cheng, M. Chauhan, and F.A. Mohamed,” Uncovering the mystery of Harper-Dorn creep in metals,” Metallurgical and Materials Transactions 40A, 80 (2009). F. A. Mohamed and H. Yang, “ Deformation mechanisms in nanocrystalline materials,” Metallurgical and Materials Transactions A, 41A, 823 (2010). F. A. Mohamed,” Deformation mechanism maps for micro- grained, ultrafine-grained, and nano-grained materials,” Materials Science Engineering A, 526, 1431 (2011). Key Publications: F.A. Mohamed, “A dislocation model for the minimum grain size obtainable by milling,” Acta Materialia, 51,4107 (2003). Yuwei Xun and F.A. Mohamed, “Superplastic Behavior of Zn-22% Al containing nano-scale dispersion particles,” Acta Materialia, 52, 4401(2004). F. A. Mohamed, “Interpretation of nanoscale softening Ni in terms of dislocation accommodation boundary sliding,” Metallurgical and Materials Transactions A, 38A, 340 (2007). Y. Cheng, M. Chauhan, and F.A. Mohamed,” Uncovering the mystery of Harper-Dorn creep in metals,” Metallurgical and Materials Transactions 40A, 80 (2009). F. A. Mohamed and H. Yang, “ Deformation mechanisms in nanocrystalline materials,” Metallurgical and Materials Transactions A, 41A, 823 (2010). F. A. Mohamed,” Deformation mechanism maps for micro- grained, ultrafine-grained, and nano-grained materials,” Materials Science Engineering A, 526, 1431 (2011). Deformation map for micro, ultrafine, nano grained materials Grain boundary sliding Using Atomic Force Microscopy in measuring Grain boundary sliding τ/G