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Author: Publisher: ISBN: Category : Languages : en Pages : 125
Book Description
The elastic properties of a solid are of considerable interest to both science and technology. Not only do they contain fundamental information about the nature of the inter-atomic bonding in the material, but they also determine the mechanical behavior of solids. In the past few years, considerable effort has been devoted to the study of elastic properties of bulk metallic glasses (BMGs), a relatively new class of metallic materials that display a unique combination of mechanical and physical properties. Our research has focused on Zr-based, Cu-based and Ca-based metallic glasses. Zr-based BMGs are known to have superior glass forming ability and high strength, but their ductility is too low for wide-spread practical applications. Cu-based BMGs recently received wide interest because of their low cost and good mechanical properties. Ca-based BMGs have low glass transition temperature T[subscript g], around 390 K, which make them very attractive to be studied near T[subscript g]. In this work, resonant ultrasound spectroscopy (RUS) has been applied to study the elastic properties of above mentioned BMGs from 5 K to their glass transition temperature T[subscript g]. RUS is a novel technique for determining the elastic moduli of solids, based on the measurement of the resonances of a freely vibrating body. In an RUS experiment, the mechanical resonances of a freely vibrating solid of known shape are measured, and an iteration procedure is used to "match" the measured lines with the calculated spectrum. This allows determination of all elastic constant of the solid from a single frequency scan. Below T[subscript g], the elastic constants of the BMGs under investigation show "normal" behavior, i.e. with increasing temperature, all moduli decrease and Poisson ratio increases. Above T[subscript g] changes in the trends occur due to structural relaxation and crystallization. We confirmed the suggested link between ductility and Poisson ratio: BMGs showing good ductility display high Poisson ratio. By increasing palladium content in Zr50Cu40-[subscript x]Al10Pd[subscript x] alloys, BMGs with high Poisson ratio and thus good ductility have been obtained. In addition, we developed a simple model to provide fast and good estimate of the temperature dependence of elastic constants of BMGs from room temperature measurements.
Author: Publisher: ISBN: Category : Languages : en Pages : 125
Book Description
The elastic properties of a solid are of considerable interest to both science and technology. Not only do they contain fundamental information about the nature of the inter-atomic bonding in the material, but they also determine the mechanical behavior of solids. In the past few years, considerable effort has been devoted to the study of elastic properties of bulk metallic glasses (BMGs), a relatively new class of metallic materials that display a unique combination of mechanical and physical properties. Our research has focused on Zr-based, Cu-based and Ca-based metallic glasses. Zr-based BMGs are known to have superior glass forming ability and high strength, but their ductility is too low for wide-spread practical applications. Cu-based BMGs recently received wide interest because of their low cost and good mechanical properties. Ca-based BMGs have low glass transition temperature T[subscript g], around 390 K, which make them very attractive to be studied near T[subscript g]. In this work, resonant ultrasound spectroscopy (RUS) has been applied to study the elastic properties of above mentioned BMGs from 5 K to their glass transition temperature T[subscript g]. RUS is a novel technique for determining the elastic moduli of solids, based on the measurement of the resonances of a freely vibrating body. In an RUS experiment, the mechanical resonances of a freely vibrating solid of known shape are measured, and an iteration procedure is used to "match" the measured lines with the calculated spectrum. This allows determination of all elastic constant of the solid from a single frequency scan. Below T[subscript g], the elastic constants of the BMGs under investigation show "normal" behavior, i.e. with increasing temperature, all moduli decrease and Poisson ratio increases. Above T[subscript g] changes in the trends occur due to structural relaxation and crystallization. We confirmed the suggested link between ductility and Poisson ratio: BMGs showing good ductility display high Poisson ratio. By increasing palladium content in Zr50Cu40-[subscript x]Al10Pd[subscript x] alloys, BMGs with high Poisson ratio and thus good ductility have been obtained. In addition, we developed a simple model to provide fast and good estimate of the temperature dependence of elastic constants of BMGs from room temperature measurements.
Author: C. Suryanarayana Publisher: CRC Press ISBN: 1351649523 Category : Technology & Engineering Languages : en Pages : 549
Book Description
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.
Author: C. Suryanarayana Publisher: CRC Press ISBN: 1439859698 Category : Technology & Engineering Languages : en Pages : 686
Book Description
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.
Author: Hu Huang Publisher: BoD – Books on Demand ISBN: 1789237203 Category : Technology & Engineering Languages : en Pages : 146
Book Description
Metallic glasses are very promising engineering and functional materials due to their unique mechanical, chemical, and physical properties, attracting increasing attention from both scientific and industrial communities. However, their practical applications are greatly hindered due to three main problems: dimensional limit, poor tension plasticity, and difficulty in machining and shaping. Therefore, further investigation of these issues is urgently required. This book provides readers with recent achievements and developments in the properties and processing of metallic glasses, including mainly thermoplastic forming of metallic glasses (Chapter 2), atomic-level simulation of mechanical deformation of metallic glasses (Chapter 3), metallic glass matrix composites (Chapter 4), and tribo-electrochemical applications of metallic glasses (Chapters 5 and 6).
Author: Behrooz Movahedi Publisher: BoD – Books on Demand ISBN: 9535125117 Category : Technology & Engineering Languages : en Pages : 180
Book Description
Metallic glasses and amorphous materials have attracted much more attention in the last two decades. A noncrystalline solid produced by continuous cooling from the liquid state is known as a glass. From the other point of view, a noncrystalline material, obtained by any other process, for example, vapor deposition or solid-state processing methods such as mechanical alloying, but not directly from the liquid state, is referred to as an amorphous material. At this moment, bulk metallic glasses (BMG) are appearing as a new class of metallic materials with unique physical and mechanical properties for structural and functional usage. Extreme values of strength, fracture toughness, magnetic properties, corrosion resistance, and other properties have been registered in BMG materials.
Author: D Uhlmann Publisher: Elsevier ISBN: 0323157289 Category : Technology & Engineering Languages : en Pages : 295
Book Description
Glass: Science and Technology, Volume 5: Elasticity and Strength in Glasses covers the scientific and engineering aspects of glass elasticity and strength. This volume is organized into six chapters and begins with the examination of the elastic properties of vitreous silica and silicate glasses, including those that contain moderate amounts of other network formers. The following chapters describe the fracture mechanics and inelastic deformation of oxide, metallic, and polymeric glasses. The discussion then shifts to the concept of glass strengthening approaches and some technologies of significant practical application to glasses. A chapter explores the process of thermal tempering of glass, including the physics, theories, and standards of the process. The last chapter focuses on the practical aspects of chemical strengthening and the mechanical and physical properties of the obtained glass. This book is of great benefit to glass scientists and researchers.
Author: Michael Miller Publisher: Springer ISBN: 9781441943132 Category : Technology & Engineering Languages : en Pages : 0
Book Description
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.
Author: Thomas F. George Publisher: ISBN: 9781611229387 Category : Science Languages : en Pages : 0
Book Description
An amorphous metal is a metallic material with a disordered atomic-scale structure. In contrast to most metals, which are crystalline and therefore have a highly ordered arrangement of atoms, amorphous alloys are non-crystalline. This book presents and reviews research in the study of bulk metallic glasses.
Author: T. R. Anantharaman Publisher: ISBN: Category : Technology & Engineering Languages : en Pages : 320
Book Description
Rapidly Solidified Metals constitute today a rapidly multiplying species of metallic materials with excellent combinations of properties that make them attractive alternatives and often serious competitors to conventional alloys in diverse industrial applications.
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Author: C. Suryanarayana
Author: C. Suryanarayana
Author: Hu Huang
Author: Behrooz Movahedi
Author: D Uhlmann
Author: Michael Miller
Author: Thomas F. George
Author: T. R. Anantharaman
Author: Hin-Wing Kui