Glass Formability and Diffusion Mechanisms in Bulk Metallic Glasses and Supercooled Liquids
Glass Formability and Diffusion Mechanisms in Bulk Metallic Glasses and Supercooled Liquids

Author:

Publisher:

Published: 2005

Total Pages: 11

ISBN-13:

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Three properties of bulk metallic glasses were investigated: (1) atomic motions; (2) characteristics of bonding and electronic states; (3) fracture. Atomic motion in glassy PdNiCuP was investigated by NMR over a wide temperature range from below the glass transition temperature Tg to above the liquidus temperature Tliq. This study reveals the temperature in the supercooled liquid region, below which motions of different elements begin to diverge. It sheds light on the nature of the crossover temperature Tc proposed by mode coupling theory. Also, hopping was shown to persist below Tg. The electronic states of various metallic glasses were studied by NMR including CuZrAl, Ce-based, and Y-based alloys. Results established some correlation between the glass forming ability and the characteristics of electronic states. This sheds light on the structure and formation of metallic glasses. Finally, we studied the fracture surfaces of various bulk metallic glasses including the brittle Mg-based bulk metallic glass. We established a clear correlation between the fracture toughness and plastic process zone size for various glasses. The results indicate that the fracture in brittle metallic glassy materials might also proceed through the local softening mechanism but at different length scales.

Bulk Metallic Glasses
Bulk Metallic Glasses

Author: C. Suryanarayana

Publisher: CRC Press

Published: 2017-11-22

Total Pages: 543

ISBN-13: 1498763685

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Reflecting the fast pace of research in the field, the Second Edition of Bulk Metallic Glasses has been thoroughly updated and remains essential reading on the subject. It incorporates major advances in glass forming ability, corrosion behavior, and mechanical properties. Several of the newly proposed criteria to predict the glass-forming ability of alloys have been discussed. All other areas covered in this book have been updated, with special emphasis on topics where significant advances have occurred. These include processing of hierarchical surface structures and synthesis of nanophase composites using the chemical behavior of bulk metallic glasses and the development of novel bulk metallic glasses with high-strength and high-ductility and superelastic behavior. New topics such as high-entropy bulk metallic glasses, nanoporous alloys, novel nanocrystalline alloys, and soft magnetic glassy alloys with high saturation magnetization have also been discussed. Novel applications, such as metallic glassy screw bolts, surface coatings, hyperthermia glasses, ultra-thin mirrors and pressure sensors, mobile phone casing, and degradable biomedical materials, are described. Authored by the world’s foremost experts on bulk metallic glasses, this new edition endures as an indispensable reference and continues to be a one-stop resource on all aspects of bulk metallic glasses.

Bulk Metallic Glasses
Bulk Metallic Glasses

Author: C. Suryanarayana

Publisher: CRC Press

Published: 2011-06-03

Total Pages: 686

ISBN-13: 1439859698

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In spite of the large amount of research activity in this subfield of materials science and engineering, there is no single book available that provides background information, methods of synthesis, characterization procedures, properties, and potential and existing applications.of bulk metallic glasses. Written in an easy-to-understand style by pioneering researchers in this field, Bulk Metallic Glasses is one of the first books to coherently discuss the synthesis, processing, properties, and applications of these unique materials. The book explores the differences between nanocrystalline, glassy, and amorphous solids as well as the thermodynamics and kinetics and various processing methods of glass formation. It critically compares the different criteria for glass formation, describes the advantages and limitations of experimental methods for synthesizing bulk metallic glasses in assorted sizes and shapes, and examines the kinetics of crystallization/devitrification and the mechanisms of transformations. It also covers the density, diffusivity, thermal expansion, electrical resistivity, specific heat, viscosity, corrosion resistance, mechanical behavior, and magnetic properties of bulk metallic glasses. After presenting a wide array of applications, the book concludes with a discussion on the future of these materials. The adoption of bulk metallic glasses into existing systems is besieged by many obstacles but due to their interesting combination of properties, future applications may be unlimited. A one-stop resource on all aspects of bulk metallic glasses, this book demonstrates the immense potential of these novel materials. It clearly elucidates the background, detailed methods of synthesis and characterization, structure, and properties of bulk metallic glasses.

Supercooled Liquids, Glass Transition and Bulk Metallic Glasses: Volume 754
Supercooled Liquids, Glass Transition and Bulk Metallic Glasses: Volume 754

Author: Takeshi Egami

Publisher:

Published: 2003-07-16

Total Pages: 512

ISBN-13:

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There has been a renaissance in glass science brought about by the development of concepts such as fragility index and the energy landscape with megabasins. Research on bulk metallic glasses has been explosive since their advent when MRS offered its first book on the topic. In 2000, a second book broadened the scope to include supercooled liquid, bulk glassy and nanocrystalline states. This book enhances the scope to include glass transition in diverse materials such as water, silicate and polymeric melts. Bringing these threads together in an interdisciplinary manner was fruitful and offers proof that while there is much common ground, gaps between various approaches to the glassy state remain to be bridged. Subjects include: the supercooled liquid; glass formability; structural relaxation and dynamics; structure determination and modeling; processing and applications of bulk metallic glasses; mechanical properties; mechanical properties - composites; crystallization; electronic and magnetic structure and properties; and nanoparticles and nonmetallic glasses.

An NMR Study of Metallic Glasses
An NMR Study of Metallic Glasses

Author:

Publisher:

Published: 1999

Total Pages: 0

ISBN-13:

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The mechanisms of atomic transport in the supercooled liquid state (SLS) and the nature of glass transition have been challenging problems for decades. It is believed that collective atomic motion plays a key role in the dramatic slow-down of kinetics near the glass transition temperature Tg. Thus, understanding the mechanisms of atomic transport is directly linked to the understanding of the glass forming ability of metallic alloys. Measurements on both macroscopic and microscopic scales are required for the understanding of atomic motions in SLS and glasses. We have developed a nuclear magnetic resonance technique, the Be-9 spin alignment echo technique (SAE), to probe slow atomic motions on microscopic scales. Systems of focus are Vitreloy 1 and Vitreloy 4, two of the Zr-Ti-Ni-Cu-Be bulk metallic glasses with extraordinary glass forming ability. By combining SAE and diffusion measurements it was revealed that long-range transport of Be atoms in the SLS is due to two diffusion processes, one of these is single-atom hopping assisted by thermal fluctuation of spread-out free volume. However, collective motion of atomic clusters dominates in the SLS. Further understanding of the influence of composition and processing on such atomic motions could lead to the improvement of glass forming ability.

Relaxation and Diffusion in Complex Systems
Relaxation and Diffusion in Complex Systems

Author: K.L. Ngai

Publisher: Springer Science & Business Media

Published: 2011-03-25

Total Pages: 853

ISBN-13: 1441976493

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The usefulness of the book to the reader is exposure to many different classes of materials and relaxation phenomena. They are tied together by the universal relaxation and diffusion properties they share, and a consistent explanation of their origin. The readers can apply what they learn to solve their own problems and use it as a stepping-stone to make further advances in theoretical understanding of the origin of the universality.

Bulk Metallic Glasses
Bulk Metallic Glasses

Author: Michael Miller

Publisher: Springer Science & Business Media

Published: 2007-09-26

Total Pages: 243

ISBN-13: 0387489215

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Bulk metallic glasses are a new emerging field of materials with many desirable and unique properties. These amorphous materials have many diverse applications from structural applications to biomedical implants. This book provides a complete overview of bulk metallic glasses. It covers the principles of alloy design, glass formation, processing, atomistic modeling, computer simulations, mechanical properties and microstructures.

Diffusion in Condensed Matter
Diffusion in Condensed Matter

Author: Paul Heitjans

Publisher: Springer Science & Business Media

Published: 2006-01-16

Total Pages: 971

ISBN-13: 3540309705

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This comprehensive, handbook-style survey of diffusion in condensed matter gives detailed insight into diffusion as the process of particle transport due to stochastic movement. It is understood and presented as a phenomenon of crucial relevance for a large variety of processes and materials. In this book, all aspects of the theoretical fundamentals, experimental techniques, highlights of current developments and results for solids, liquids and interfaces are presented.

Dynamical Heterogeneities in Glasses, Colloids, and Granular Media
Dynamical Heterogeneities in Glasses, Colloids, and Granular Media

Author: Ludovic Berthier

Publisher: OUP Oxford

Published: 2011-07-14

Total Pages: 464

ISBN-13: 0191621307

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Most of the solid materials we use in everyday life, from plastics to cosmetic gels exist under a non-crystalline, amorphous form: they are glasses. Yet, we are still seeking a fundamental explanation as to what glasses really are and to why they form. In this book, we survey the most recent theoretical and experimental research dealing with glassy physics, from molecular to colloidal glasses and granular media. Leading experts in this field present broad and original perspectives on one of the deepest mysteries of condensed matter physics, with an emphasis on the key role played by heterogeneities in the dynamics of glassiness.