Ion Mixing and Phase Diagrams, (9999)
Lau,S. S., Liu,B. X., Nicolet,Marc-A., Johnson,William L.
Interactions induced by ion irradiation are generally considered to be non-equilibrium processes, whereas phase diagrams are determined by phase equilibria. These two entities are seemingly...
Rheology and ultrasonic properties of metallic glass-forming liquids (2009)
Demetriou, Marios D., Johnson, William L., Samwer, Konrad
The flow of metallic glass-forming liquids can be modeled as configurational hopping between inherent states across energy barriers that are assumed to be on average sinusoidal. Such treatment gives...
Glassy steel optimized for glass-forming ability and toughness (2009)
Demetriou, Marios D., Kaltenboeck, Georg, Suh, Jin-Yoo, Garrett, Glenn, Floyd, Michael, Crewdson, Chase, ...
An alloy development strategy coupled with toughness assessments and ultrasonic measurements is implemented to design a series of iron-based glass-forming alloys that demonstrate improved...
Coarse-grained description of localized inelastic deformation in amorphous metals (2009)
Demetriou, Marios D., Johnson, William L., Samwer, Konrad
The sequence of shear transformation events that lead to a shear band transition in amorphous metals is described by a spatially random coarse-grained model calibrated to obey the thermodynamic...
Solution to the problem of the poor cyclic fatigue resistance of bulk metallic glasses (2009)
Launey, Maximilien E., Hofmann, Douglas C., Johnson, William L., Ritchie, Robert O.
The recent development of metallic glass-matrix composites represents a particular milestone in engineering materials for structural applications owing to their remarkable combination of strength and...
Injection molding metallic glass (2009)
Wiest, Aaron, Harmon, John S., Demetriou, Marios D., Conner, R. Dale, Johnson, William L.
Advances in alloy development have produced the Zr_(35)Ti_(30)Be_(27.5)Cu_(7.5) alloy with a crystallization–glass transition temperature, ΔT, of 165 °C. This alloy’s large supercooled liquid...
Fracture toughness study of new Zr-based Be-bearing bulk metallic glasses (2009)
Kim, C. Paul, Suh, Jin-Yoo, Wiest, Aaron, Lind, Mary Laura, Conner, R. Dale, Johnson, William L.
Three new compositional variants of the Zr–Ti–Be–LTM (late transition metal) family of metallic glasses are discussed. Thermal stability, ΔT = T_x−T_g, was increased from 82 °C for...
Hofmann, Douglas C., Suh, Jin-Yoo, Wiest, Aaron, Lind, Mary Laura, Demetriou, Marios D., Johnson, William L.
The mechanical properties of bulk metallic glasses (BMGs) and their composites have been under intense investigation for many years, owing to their unique combination of high strength and elastic...
Stochastic Metallic-Glass Cellular Structures Exhibiting Benchmark Strength (2008)
Demetriou, Marios D., Veazey, Chris, Harmon, John S., Schramm, Joseph P., Johnson, William L.
By identifying the key characteristic “structural scales” that dictate the resistance of a porous metallic glass against buckling and fracture, stochastic highly porous metallic-glass structures...
Novel thermoplastic bonding using a bulk metallic glass solder (2008)
Suh, Jin-Yoo, Lohwongwatana, Boonrat, Garland, Carol M., Conner, R. Dale, Johnson, William L., Suh, Daewoong
A novel thermoplastic bonding concept is demonstrated based on the unique rheological behavior and pattern-replicating ability of bulk metallic glass (BMG)-forming liquids. In this approach, the BMG...
Hachenberg, Jörg, Bedorf, Dennis, Samwer, Konrad, Richert, Ranko, Kahl, Annelen, Demetriou, Marios D., ...
This paper provides evidence that the physical aging of deeply and rapidly quenched metallic glasses is promoted by the Johari–Goldstein slow beta relaxation, resulting in a significant...
Calculation of Mechanical, Thermodynamic and Transport Properties of Metalic Glass formers (2007)
Tahir Çagin, Yoshitaka Kimura, Yue Qi, Hao Li, Hideyuki Ikeda, William L. Johnson, ...
Recently, we have parametrized Sutton-Chen type empirical many body force fields for FCC transition metals to study the thermodynamic, mechanical, transport and phase behavior of metals and their...
Molecular Dynamics Simulation on Plastic Deformation of Metallic Nanowires (2007)
H. Ikeda, Y. Qi, T. Cagin, K. Samwer, W. Johnson, W. Goddard Iii, ...
We have studied the initial stage of plastic deformation behavior of metallic nanowire of pure nickel, by using molecular dynamics methods. In these simulations, we applied uniform strain along...
High porosity metallic glass foam: A powder metallurgy route (2007)
Demetriou, Marios D., Schramm, Joseph P., Veazey, Chris, Johnson, William L., Hanan, Jay C., Phelps, Nicholas B.
A powder metallurgy route to the fabrication of metallic glass foam is introduced. The method involves consolidating metallic glass powder blended with blowing agent particulates to produce...
Anelastic to Plastic Transition in Metallic Glass-Forming Liquids (2007)
Harmon, John S., Demetriou, Marios D., Johnson, William L., Samwer, Konrad
The configurational properties associated with the transition from anelasticity to plasticity in a transiently deforming metallic glass-forming liquid are studied. The data reveal that the underlying...
Thermal and elastic properties of Cu–Zr–Be bulk metallic glass forming alloys (2007)
Duan, Gang, Lind, Mary Laura, De Blauwe, Katrien, Wiest, Aaron, Johnson, William L.
The compositional dependence of thermal and elastic properties of Cu–Zr–Be ternary bulk metallic glass forming alloys was systematically studied. There exists a linear relationship between the...
Rheology and ultrasonic properties of Pt57.5Ni5.3Cu14.7P22.5 liquid (2007)
Harmon, John S., Demetriou, Marios D., Johnson, William L.
The equilibrium and nonequilibrium viscosity and isoconfigurational shear modulus of Pt57.5Ni5.3Cu14.7P22.5 supercooled liquid are evaluated using continuous–strain-rate compression experiments and...
Harmon, John S., Demetriou, Marios D., Johnson, William L., Tao, Min
The change in the configurational enthalpy of metallic glass forming liquids induced by mechanical deformation and its effect on elastic softening is assessed. The acoustically measured shear modulus...
Strong configurational dependence of elastic properties for a binary model metallic glass (2006)
Duan, Gang, Lind, Mary Laura, Demetriou, Marios D., Johnson, William L., Çağin, Tahir, ...
In this work, the strong dependence of elastic properties on configurational changes in a Cu–Zr binary metallic glass assessed by molecular dynamics simulations is reported. By directly evaluating...
Thermal expansion of liquid Ti–6Al–4V measured by electrostatic levitation (2006)
Li, John J. Z., Johnson, William L., Rhim, Won-Kyu
The liquid density of Ti–6Al–4V was measured over a temperature range from 1661 to 1997 K that included undercooling by as much as 280 K. The sample was levitated in an electrostatic levitator...
Cooperative Shear Model for the Rheology of Glass-Forming Metallic Liquids (2006)
Demetriou, Marios D., Harmon, John S., Tao, Min, Duan, Gang, Samwer, Konrad, Johnson, William L.
A rheological law based on the concept of cooperatively sheared flow zones is presented, in which the effective thermodynamic state variable controlling flow is identified to be the...
Lind, Mary Laura, Duan, Gang, Johnson, William L.
Samples of Zr46.25Ti8.25Cu7.5Ni10Be27.5 were isothermally annealed and quenched near the glass transition temperature and studied by the pulse-echo overlap technique. The shear modulus G of the...
Xu, Donghua, Johnson, William L.
Due to their scientific significance and potential engineering applications, bulk metallic glasses are among the most intensively studied advanced materials. Understanding the glass-forming ability...
Strain Rate Induced Crystallization in Bulk Metallic Glass-Forming Liquid (2006)
Lohwongwatana, Boonrat, Schroers, Jan, Johnson, William L.
We report on the solidification of Au49Ag5.5Pd2.3Cu26.9Si16.3 bulk metallic glass under various strain rates. Using a copper mold casting technique with a low strain rate during solidification, this...
Kim, Ki Buem, Yi, Seonghoon, Choi-Yim, Haein, Das, Jayanta, Johnson, William L., Eckert, Jürgen
We report on experimental evidence for local amorphization/nanocrystallization at the interfaces between the B2-ordered Ni(Ti,Zr) phase and the NiTiZr phase with P63/mmc during solidification of a...
Gold based bulk metallic glass (2005)
Schroers, Jan, Lohwongwatana, Boonrat, Johnson, William L., Peker, Atakan
Gold-based bulk metallic glass alloys based on Au-Cu-Si are introduced. The alloys exhibit a gold content comparable to 18-karat gold. They show very low liquidus temperature, large supercooled...
Duan, Gang, Xu, Donghua, Zhang, Qing, Zhang, Guoyun, Çağin, Tahir, Johnson, William L., ...
We have identified a binary bulk metallic glass forming alloy Cu46Zr54 by analyzing the structure and thermal behaviors of copper mold cast samples using x-ray diffraction, transmission electron...
Bossuyt, Sven, Schroers, Jan, Rhim, Won-Kyu, Johnson, William L.
We present an approach to reduce the convective flow in an electrostatically levitated liquid droplet to such an extent that diffusion is the dominant mechanism for mass transport, thus enabling...
Löffler, Jörg F., Schwarz, R. B., Johnson, William L., Wu, Yue
Atomic motion and electronic structures of Pd–Ni–Cu–P bulk metallic glasses were investigated using 31P nuclear magnetic resonance. The hopping rate of P atoms was determined by the stimulated...
Ductile Bulk Metallic Glass (2004)
Schroers, Jan, Johnson, William L.
We report on experimental evidence of pronounced global plasticity measured in monolithic Pt57.5Cu14.7Ni5.3P22.5 bulk metallic glass under both bending and unconfined compression loading conditions....
Synthesis method for amorphous metallic foam (2004)
Schroers, Jan, Veazey, Chris, Demetriou, Marios D., Johnson, William L.
A synthesis method for the production of amorphous metallic foam is introduced. This method utilizes the thermodynamic stability and thermoplastic formability of the supercooled liquid state to...
Enhanced temperature uniformity by tetrahedral laser heating (2004)
Schroers, Jan, Bossuyt, Sven, Rhim, Won-Kyu, Li, Jianzhong, Zhou, Zhenhua, Johnson, William L.
emperature profile on a spherical sample that is heated by laser beams in various geometries while processed in vacuum is analyzed. Sample heating by one or four laser beams was considered. An...
Xu, Donghua, Duan, Gang, Johnson, William L., Garland, Carol
New Ni-based bulk metallic glasses were synthesized in NixCua−xTiyZrb−yAl10 (a~b~45 at.%) system, based on a ternary alloy, Ni45Ti20Zr35. The additions of Al and Cu greatly increase the...
Unusual Glass-Forming Ability of Bulk Amorphous Alloys Based on Ordinary Metal Copper (2004)
Xu, Donghua, Duan, Gang, Johnson, William L.
We report the unusual glass-forming ability (GFA) of a family of Cu-based alloys, Cu46Zr47–xAl7Yx (0
Highly processable bulk metallic glass-forming alloys in the Pt–Co–Ni–Cu–P system (2004)
Schroers, Jan, Johnson, William L.
Highly processable bulk metallic glass alloys in the Pt–Co–Ni–Cu–P system were discovered. The alloys show low liquidus temperature below 900 K, excellent processability with low critical...
Typescript (photocopy).
Criteria for formation of metallic glasses: The role of atomic size ratio (2003)
Lee, Hyon-Jee, Çağin, Tahir, Johnson, William L.
We consider metallic alloys of Cu*, Cu, and Cu** in which the atoms differ only in their atomic radii and examine how the size ratio affects the local orders in the alloy systems. These studies use...
Waniuk, Theodore, Schroers, Jan, Johnson, William L.
Crystallization behavior and equilibrium viscosity of a series of alloys in the Zr-Ti-Cu-Ni-Be system are studied using multiple techniques to determine the various contributions to glass-forming...
Amorphous metallic foam (2003)
Schroers, Jan, Veazey, Chris, Johnson, William L.
The bulk glass forming alloy Pd43Ni10Cu27P20 is processed into a low-density amorphous metallic foam. Pd43Ni10Cu27P20 is mixed with hydrated B2O3, which releases gas at elevated temperature and/or...
Extremely low critical cooling rate measured on dispersed Pd43Ni10Cu27P20 (2002)
Schroers, Jan, Johnson, William L.
Crystallization of dispersed Pd43Ni10Cu27P20 melts is studied during constant cooling and heating. Investigations are carried out on samples that are dispersed into several hundred particles which...
Choi-Yim, Haein, Schroers, Jan, Johnson, William L.
Tungsten wire or particle reinforced metallic glass matrix composites are produced by infiltrating liquid Zr57Nb5Al10Cu15.4Ni12.6 (Vit106) into tungsten reinforcements at 1150 and at 1425 K. X-ray...
Melting and crystallization in Ni nanoclusters: The mesoscale regime (2001)
Qi, Yue, Çağin, Tahir, Johnson, William L.
We studied melting and freezing of Ni nanoclusters with up to 8007 atoms (5.7 nm) using molecular dynamics with the quantum-Sutten–Chen many-body force field. We find a transition from cluster or...
Critical cooling rate and thermal stability of Zr–Ti–Cu–Ni–Be alloys (2001)
Waniuk, Theodore A., Schroers, Jan, Johnson, William L.
The critical cooling rate as well as the thermal stability are measured for a series of alloys in the Zr–Ti–Cu–Ni–Be system. Upon cooling from the molten state with different rates, alloys...
Long-term structural health monitoring of polymer composite bridges / (2001)
Thesis (M.C.E.)--University of Delaware, 2002.
Crystallization kinetics of the bulk-glass-forming Pd43Ni10Cu27P20 melt (2000)
Schroers, Jan, Johnson, William L., Busch, Ralf
The crystallization of undercooled Pd43Ni10Cu27P20 melts is studied under isothermal conditions and at constant heating and cooling rates. Investigations are carried out by fluxing the melt with B2O3...
Löffler, Jörg F., Schroers, Jan, Johnson, William L.
Isothermal crystallization studies were performed on the bulk glass forming alloy Pd40Cu30Ni10P20 in the undercooled liquid region between the glass transition and liquidus temperature, resulting in...
History dependent crystallization of Zr41Ti14Cu12Ni10Be23 melts (2000)
Schroers, Jan, Johnson, William L.
The crystallization of Zr41Ti14Cu12Ni10Be23 (Vit 1) melts during constant heating is investigated. (Vit 1) melts are cooled with different rates into the amorphous state and the crystallization...
Repeated crystallization in undercooled Zr41Ti14Cu12Ni10Be23 liquids (2000)
Schroers, Jan, Johnson, William L., Busch, Ralf
Isothermal crystallization studies are performed on Zr41Ti14Cu12Ni10Be23 melts. Undercooling experiments are carried out repeatedly at 907, 860, and 750 K. The scattering of the time to reach the...
Schroers, Jan, Masuhr, Andreas, Johnson, William L., Busch, Ralf
The crystallization behavior of the supercooled bulk metallic glass-forming Zr41Ti14Cu12Ni10Be23 liquid was studied with different heating and cooling rates. A rate of about 1 K/s is sufficient to...
Strain Rate Induced Amorphization in Metallic Nanowires (1999)
Ikeda, Hideyuki, Qi, Yue, Çağin, Tahir, Samwer, Konrad, Johnson, William L.
Using molecular dynamics simulations with a many-body force field, we studied the deformation of single crystal Ni and NiCu random alloy nanowires subjected to uniform strain rates but kept at 300 K....
Strain Rate Induced Amorphization in Metallic Nanowires (1999)
H. Ikeda, Y. Qi, T. Cagin, K. Samwer, W. L. Johnson, W. A. Goddard, ...
Using molecular dynamics simulations with a many-body force field, we studied the deformation of metal alloy nanowires subjected to various strain rates. For all strain rates, the Ni nanowire is...
Slow Atomic Motion in Zr-Ti-Cu-Ni-Be Metallic Glasses Studied by NMR (1998)
Busch, Ralf, Johnson, William L., Wu, Y.
Nuclear magnetic resonance is used for the first time to detect slow atomic motion in metallic glasses, specifically, Be motion in Zr-Ti-Cu-Ni-Be bulk metallic glasses. The observations are not...
Johnson, William L., Schick, Milton J.
Infinite Materials & Products, Inc., has developed a revolutionary waterproof 3-minute cure polyurethane resin which has no shrinkage, micro-cracking, water absorption or penetration, or stress...
Bulk Metallic Glass Matrix Composites (1998)
Bulk metallic glass (BMG) forming alloys were used to synthesis metal matrix composites with the BMG as the matrix. The second phase in the composite is a refractory ceramic material (e.g....
Sign language interpreters are at increased risk for musculoskeletal disorders. This study used content analysis to obtain detailed information about these disorders from the interpreters' point of...
Caltech Center for Structural and Amorphous Metals (1998)
Johnson, William L., Conner, R. D.
The report summarizes the results of the university Structural Amorphous Metals Program sponsored by ARO/DARPA. It discusses laboratory and theoretical developments in discovery and understanding of...
Research paper, 3 hrs.
Atzmon, Michael, Verhoeven, John D., Gibson, Edwin D., Johnson, William L.
Amorphous alloys of Ni-Zr and Cu-Zr have been synthesized by solid-state reaction of composite metal mixtures produced by mechanical deformation of metal powder mixtures and intercalated foil layers....
The structure and properties of some Rh0.92-xBxSi0.08 metallic glasses (1982)
Williams, Arthur, Mehra, Madhav, Johnson, William L.
Rhodium-based metallic glasses have been produced with over 40 at.% metalloids (Si and B). X-ray diffraction studies are presented here on Rh0.92-xBxSi0.08 metallic glasses, with x=0.22, 0.27 and...
Thesis (M.A.)--University of Wyoming, 1977.
Superconductivity in metal-semiconductor eutectic alloys / (1975)
Thesis--California Institute of Technology.
A handbook of finite mathematics methods for the business major. (1972)
Thesis (M.A.)--Pacific Lutheran University, 1972.
Thesis (M.S.)--Mississippi State University, 1970. Department of Entomology.
Thesis (Ph. D.)--University of Kansas, Chemistry, 1970.
Handwritten thesis submitted in partial fulfillment of the requirements of the degree of M.D.
Pagoulatos, Angelos, Debertin, David L., Johnson, William L.
Farm Management,
Hofmann, Douglas C., Suh, Jin-Yoo, Wiest, Aaron, Lind, Mary-Laura, Demetriou, Marios D., Johnson, William L.
The mechanical properties of bulk metallic glasses (BMGs) and their composites have been under intense investigation for many years, owing to their unique combination of high strength and elastic...
Solution to the problem of the poor cyclic fatigue resistance of bulk metallic glasses
Launey, Maximilien E., Hofmann, Douglas C., Johnson, William L., Ritchie, Robert O.
The recent development of metallic glass-matrix composites represents a particular milestone in engineering materials for structural applications owing to their remarkable combination of strength and...