Perepezko, John H.

Amorphous Metal Structures and Method, US Patent 4,282,034.
Metal Droplet Formation of High Melting Point Metals, US Patent 4,321,086.
Semiconductor Device Having an Amorphous Metal Layer Contact, US Patent 4,494,136.
Use of Metallic Glasses for Fabrication of Structures with Submicron Dimensions, US Patent 4,630,094.
Method of Evaluation and Identification for the Design of Effective Innoculation Agents, US Patent 5,066,324.
In-Situ Debond Coating for Fibers. US Patent 6,056,907.
In-Situ Debond Coating for Fibers, US Patent 6,376,074.
Process for Preparing In-Situ Single Crystal Composites of Titanium-Aluminum-Niobium Alloys, US Patent 6,436,208.

Papers

H. Sieber, J.S. Park, J. Weissmüller and J.H. Perepezko, Phase Reactions in Cold Rolled Al/Ni Multilayers Acta Materialia 49 1139 (2001).
J.H. Perepezko, R. Sakidja, S. Kim and J.S. Park, Multiphase Microstructures and Stability in High Temperature Mo-Si-B Alloys, in Structural Intermetallics 2001, Eds. K.J. Hemker, D.M. Dimiduk, H. Clemens, R. Darolia, H. Inui, J.M. Larsen, V.K. Sikka,M. Thomas and J.D. Whittenberger, (TMS, Warrendale, PA) 505 (2001).
J.H. Perepezko and R.J. Hebert, Amorphous Aluminum Alloys-Synthesis and Stability, Journal of Metals 54 34 (2002).
J.S. Park, R. Sakidja and J.H. Perepezko, Coating Designs for Oxidation Control of Mo-Si-B Alloys, Scripta Materialia 46 765 (2002).
J.H. Perepezko, R.J. Hebert and W.S. Tong, Amorphization and Nanostructure Synthesis in Al Alloys, Intermetallics 10 1079 (2002).
J.H. Perepezko, P.G. Höckel, J.S. Paik, Initial Crystallization Kinetics in Undercooled Droplets , Thermochemica Acta 388 129 (2002).
J. H. Perepezko and W. S. Tong, Nucleation-Catalysis-Kinetics Analysis under Dynamic Conditions,Philosophical Transactions of the Royal Society of London Series A, 361, 447 (2003).
R. J. Hebert and J. H. Perepezko, Structural Transformations in Crystalline and Amorphous Multilayer Samples during Cold-Rolling, Scripta Mat., 49, 933 (2003).
J. H. Perepezko, R. J. Hebert, W. S. Tong, J. Hamann, H. R. Rosner and G. Wilde, Nanocrystallization Reactions in Amorphous Aluminum Alloys, Mater. Trans. JIM, 44 1982 (2003).
J.H. Perepezko and R.J. Hebert, Alloying Reactions in Nanostructured Multilayers during Intense Deformation, Z. Metallkd. 94 1111(2003).
R. Sakidja, S. Kim, J.S. Park, and J.H. Perepezko, Transition Metal Alloying and Phase Stability in the Mo-Si-B System, Mat. Res. Soc. Symp., 753 BB2.3 (2003).
D.M. Dimiduk and J.H. Perepezko, Mo-Si-B Alloys: Developing a Revolutionary Turbine-Engine Materials MRS Bulletin, 28 639 (2003).
J.H. Perepezko, Nucleation-Controlled Reactions and Metastable Structures, Progress in Materials Science, 49 263 (2004).
R. J. Hebert and J. H. Perepezko, Deformation-induced synthesis and structural transformations of metallic multilayers, Scripta Materialia, 50 807 (2004).
J.H. Perepezko, Nanocrystallization, Encylopedia of Nanoscience and Nanotechnology,. (Marcel Dekker, New York) 2305 (2004).

Selected Awards, Honors and Societies

Fellow of ASM-International, TMS
Alexander von Humboldt Foundation Forschungpreise (1996)
Member of National Academy of Engineering
Principal Editor for Scripta Materialia
IBM-Bascom Professorship
Member of TMS, AIME, ASM, Electrochemical Society, Alpha Sigma Mu, Sigma Xi, APMI, MRS, ASEE.
Who's Who in Engineering

Summary

As a result of our efforts in the analysis and modeling of alloy solidification it has been possible to identify new microstructural morphologies and to establish processing conditions where nucleation controlled kinetics dominates the microstructural evolution. This basic information can be applied to understand grain refinement and novel microstructures in cast and rapidly solidified alloys. It also is used to guide microgravity materials processing and alloy design including the solidification processing of composite materials. Extreme solidification conditions at high rates and /or high undercooling often result in metastable phases and amorphous alloys. Our work on amorphous Al alloys has focused on understanding glass formation and the primary crystallization reaction that yields a high density of Al nanocrystals. Interestingly, similar microstructures can be synthesized by the repeated cold rolling of elemental multilayers as a driven system processing where the deformation induced alloying at interfaces is a key issue for study.

Our work has yielded new understanding on the nucleation of phases during interdiffusion and interface reaction in thin-film multilayers. With this understanding we have developed the concept of a kinetic bias and have demonstrated the application of biasing to control diffusion pathways and produce phase selection during interfacial reactions in multicomponent systems. These concepts provide for an effective strategy to synthesize structural composites by in-situ reactions and also to develop electronic materials such as photovoltaics or high-temperature devices from multilayers. We have recently extended the capability of using in-situ reactions and kinetic biasing to the design of robust coatings that exhibit self-healing behavior as well as oxidation protection at high temperature.

Other studies of multiphase microstructures involve examining high-temperature alloys such as superalloys, titanium aluminide intermetallics and refractory alloys. The examination of phase stability and reaction kinetics during processing provides a basis for the achievement of tailored microstructures and alloy designs to enhance performance in structural applications as demonstrated in advanced Mo-Si-B alloys.

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Date last modified: Wednesday, 09-Mar-2005 15:50:08 CST
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