Download or read book Formation and Modification of Surface Alloys by Excimer Laser Melting and Resolidification written by and published by . This book was released on 1989 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of pulsed lasers operating in the ultra-violet for the formation and modification of metal alloys opens a range of processing techniques which offer the precision of ion beam techniques but at much higher processing rates. In addition, excimer laser surface processing offers the possibility of new surface modification technologies. Most metals have low reflectivities in the uv, so laser light is coupled strongly to the surface. The short pulse length of these lasers, along with a shallow absorption depth, results in a heated zone which is also quite shallow, of the order of 1 micrometer. Modest fluences, of the order of 1 J-cm−2 are sufficient to melt this surface zone. Typical quench rates from the melt are of the order of 101° K-sec−1; high enough to produce amorphous phases in some materials. Mixing by liquid phase diffusion between layers of vacuum evaporated materials and zone refinement can result from multiple melt resolidification events. These techniques make available a large range of alloy compositions on engineering materials. The surface morphology of the processed layers is quite smooth with a surface finish less than 100 nm. Further processing prior to use is therefore not required for most applications. We have studied laser mixing of metals into engineering materials, both metal alloys and ceramics, the formation of ceramic structures on metals, the modification of alloys by surface zone refinement, and the mixing of binary and ternary multilayer structures. 25 refs., 6 figs., 2 tabs.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Modification and Alloying written by J.M. Poate and published by Springer Science & Business Media. This book was released on 2013-11-21 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an outcome of the NATO institute on surface modification which was held in Trevi, 1981. Surface modification and alloying by ion, electron or laser beams is proving to be one of the most burgeoning areas of materials science. The field covers such diverse areas as integrated circuit processing to fabricating wear and corrosion resistant surfaces on mechanical components. The common scientific questions of interest are the microstructures by the different energy deposition techniques. and associated physical properties produced The chapters constitute a critical review of the various subjects covered at Trevi. Each chapter author took responsibility for the overall review and used contributions from the many papers presented at the meeting; each participant gave a presentation. The contributors are listed at the start of each chapter. We took this approach to get some order in a large and diverse field. We are indebted to all the contributors, in particular the chapter authors for working the many papers into coherent packages; to Jim Mayer for hosting a workshop of chapter authors at Cornell and to Ian Bubb who did a sterling job in working over some of the manuscripts. Our special thanks are due to the text processing center at Bell Labs who took on the task of assembling the book. In particular Karen Lieb and Beverly Heravi typed the whole manuscript and had the entire book phototypeset using the Bell Laboratories UNIXTM system.
Download or read book Excimer Laser Surface Modification written by and published by . This book was released on 1992 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface modification can improve materials for structural, tribological, and corrosion applications. Excimer laser light has been shown to provide a rapid means of modifying surfaces through heat treating, surface zone refining, and mixing. Laser pulses at modest power levels can easily melt the surfaces of many materials. Mixing within the molten layer or with the gas ambient may occur, if thermodynamically allowed, followed by rapid solidification. The high temperatures allow the system to overcome kinetic barriers found in some ion mixing experiments. Alternatively, surface zone refinement may result from repeated melting-solidification cycles. Ultraviolet laser light couples energy efficiently to the surface of metallic and ceramic materials. The nature of the modification that follows depends on the properties of the surface and substrate materials. Alloying from both gas and predeposited layer sources has been observed in metals, semiconductors, and ceramics as has surface enrichment of Cr by zone refinement of stainless steel. Rapid solidification after melting often results in the formation of nonequilibrium phases, including amorphous materials. Improved surface properties, including tribology and corrosion resistance, are observed in these materials.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Download or read book Laser Surface Modification of Alloys for Corrosion and Erosion Resistance written by C T Kwok and published by Elsevier. This book was released on 2012-03-20 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion and erosion processes often occur synergistically to cause serious damage to metal alloys. Laser surface modification techniques such as laser surface melting or alloying are being increasingly used to treat surfaces to prevent corrosion or repair corroded or damaged components. Laser surface modification of alloys for corrosion and erosion resistance reviews the wealth of recent research on these important techniques and their applications.After an introductory overview, part one reviews the use of laser surface melting and other techniques to improve the corrosion resistance of stainless and other steels as well as nickel-titanium and a range of other alloys. Part two covers the use of laser surface modification to prevent different types of erosion, including liquid impingement, slurry (solid particle) and electrical erosion as well as laser remanufacturing of damaged components.With its distinguished editor and international team of contributors, Laser surface modification of alloys for corrosion and erosion resistance is a standard reference for all those concerned with preventing corrosion and erosion damage in metallic components in sectors as diverse as energy production and electrical engineering. - Reviews recent research on the use of laser surface modification techniques, including the prevention of corrosion and repair of corroded or damaged components - Discusses the techniques for improving the corrosion resistance of steels, nickel-titanium and a range of alloys - Analyses the use of laser surface modification to prevent different types of erosion, including liquid impingement and laser remanufacturing of damaged components
Download or read book Excimer Laser Surface Processing of Titanium written by and published by . This book was released on 1993 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have examined the effect of laser surface processing of Ti alloys using pulsed excimer laser light at 248 nm. Thermal transformations of the surface are accomplished by heating the surface and rapid cooling. Alloying and formation of compounds can be obtained by melting and mixing surface layers into the material and by gas alloying. Multiple melting-resolidification cycles result in the inter-diffusion of surface layers in the liquid state and the diffusion of gas species into the material. The effect of alloying from both solid and gas sources and the effects of thermal transformations on the microstructure and surface hardness properties of these alloys will be examined.
Download or read book Non equilibrium Processing of Materials written by C. Suryanarayana and published by Elsevier. This book was released on 1999-07-22 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rapid technological developments during the later half of the 20th century have demanded materials that are stronger, capable of use at much higher temperatures, more corrosion-resistant, and much less expensive than those currently used. These demands become even more significant on the threshold of the new century and the millennium. Significant improvements in properties can only be achieved by processing the materials under far-from-equilibrium (or non-equilibrium) conditions. Several new processing technologies have been developed during the past few decades including, rapid solidification, spray forming, mechanical alloying, ion mixing, vapor deposition, laser processing and plasma processing. Remarkable advances have been made in recent years in the science and technology of these processes used to synthesize, characterize, and apply these materials processed under non-equilibrium conditions. Some of these techniques have evolved from laboratory curiosity to commercial-scale manufacturing in just a few years. In other cases, industrial necessity prompted development of the technology, and the science followed later. The chapters in this book have been written by people who are world-recognized experts in their respective fields. Each chapter describes the principles, processing techniques, special features of the materials produced, and their applications. An extensive list of references is provided at the end of each chapter that will facilitate location of additional information on specific aspects of any technique.
Download or read book Advanced Manufacturing Techniques Using Laser Material Processing written by Akinlabi, Esther Titilayo and published by IGI Global. This book was released on 2016-04-14 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of lasers in material processing has become a useful method for transforming industrial materials into finished products. The benefits of laser material processing are vast, including increased precision, high processing speed, and dustless cutting and drilling. Advanced Manufacturing Techniques Using Laser Material Processing explores the latest methodologies for using lasers in materials manufacturing and production, the benefits of using lasers in industrial settings, as well as future outlooks for this technology. This innovative publication is an essential reference source for professionals, researchers, and graduate-level students studying manufacturing technologies and industrial engineering.
Download or read book Lasers in Surface Engineering written by Narendra B. Dahotre and published by ASM International. This book was released on 1998-01-01 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents various facets of laser surface treatment, emphasizing technologies that are expected to be important soon. The topics include fundamentals and types, surface texturing, heat treatment, metallic and intermetallic coating, the laser deposition of ceramic coatings, polymeric coatings, the cor
Download or read book Beam Solid Interactions Volume 279 written by Michael Nastasi and published by . This book was released on 1993-08-09 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MRS Symposium Proceeding series is an internationally recognised reference suitable for researchers and practitioners.
Download or read book Laser Processing of Engineering Materials written by John Ion and published by Elsevier. This book was released on 2005-03-22 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: The complete guide to understanding and using lasers in material processing!Lasers are now an integral part of modern society, providing extraordinary opportunities for innovation in an ever-widening range of material processing and manufacturing applications. The study of laser material processing is a core element of many materials and manufacturing courses at undergraduate and postgraduate level. As a consequence, there is now a vast amount of research on the theory and application of lasers to be absorbed by students, industrial researchers, practising engineers and production managers. Written by an acknowledged expert in the field with over twenty years' experience in laser processing, John Ion distils cutting-edge information and research into a single key text. Essential for anyone studying or working with lasers, Laser Processing of Engineering Materials provides a clear explanation of the underlying principles, including physics, chemistry and materials science, along with a framework of available laser processes and their distinguishing features and variables. This book delivers the knowledge needed to understand and apply lasers to the processing of engineering materials, and is highly recommended as a valuable guide to this revolutionary manufacturing technology. The first single volume text that treats this core engineering subject in a systematic manner Covers the principles, practice and application of lasers in all contemporary industrial processes; packed with examples, materials data and analysis, and modelling techniques
Download or read book Preprints Presented at the STLE Annual Meeting written by and published by . This book was released on with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Excimer Laser Processing of Tool Steel written by and published by . This book was released on 1995 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excimer lasers were used to modify the surface of AISI type A-7 tool steel, a high C, high V, high Cr material used in many cutting applications. Multiple pulses of laser radiation at 248 nm were used to alter the composition of the surface alloy. Hardness and modulus were not significantly affected by the treatment, but friction in dry sliding against an alumina pin was reduced. The reduction was small but persistent for multiply melted and resolidified surfaces. These surfaces showed a marked increase in the surface Cr concentration. Greater reductions in friction were obtained from a Ti rich surface layer formed by laser mixing an evaporated Ti layer into the material. The friction coefficient of the Ti alloyed surface deteriorated after approximately 1000 cycles, indicating wear=through of the modified surface. The observed properties will be discussed in terms of the excimer laser modification process and the microstructure and composition of the resulting surfaces.
Download or read book Lubrication Engineering written by and published by . This book was released on with total page 1086 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Light Alloys 3 written by A. J. Davenport and published by The Electrochemical Society. This book was released on 2008-03 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers included in this issue of ECS Transactions were originally presented in the symposium ¿Light Alloys 3¿, held during the 212th meeting of The Electrochemical Society, in Washington, DC, from October 7 to 12, 2007.
Download or read book Adhesion Promotion Techniques written by K.L. Mittal and published by CRC Press. This book was released on 1999-02-02 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the state of the art in improving bond strength between different materials for many manufacturing processes. The text explores up-to-date, high-quality adhesion technologies for a wide variety of materials, explaining current capabilities of adhesion promotion for both students and seasoned researchers. It reviews the suitable chemistry o
