Download or read book Size related Mechanical Properties of Pure Magnesium written by QIAN. YU and published by . This book was released on 2012 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnesium (Mg) is the lightest structural metal in the world. Therefore, Mg alloys hold great promise for weight-saving applications in the automotive and aerospace industries. However, the hexagonal close-packed (HCP) structure of Mg alloys results in limited dislocation plasticity and alternative deformation mechanisms such as deformation twinning that leads to poor formability and mechanical performance of Mg alloys. This inherent low ductility in Mg restricts its broad applicability as a high performance structural material. Further understanding of the fundamental deformation behavior in Mg and its alloys is therefore critical in order to identify potential processing routes that could enable high strength and ductility performance in Mg alloys. Dimensional refinement is regarded as an efficient way to tune the mechanical properties of materials. To probe the size-related mechanical properties of Mg and also the related fundamental deformation mechanisms, a series of in situ transmission electron microscopy nanocompression (TEM), nanotension and nanobending tests were conducted on single crystal and polycrystalline Mg with different crystallographic orientations. The external dimensions of the samples studied ranged from approximately 100 to 900 nm. The effect of crystal size was studied in regard to both deformation twinning behavior and dislocation behavior in single crystal Mg oriented for deformation twinning and basal slip, respectively. The influence of different grain boundary structures on the mechanical properties of polycrystalline Mg were also investigated using bicrystalline Mg specimens with constrained physical dimensions. For deformation twinning in Mg, it was found that there is strong crystal size effect. The formation of nanotwins was obtained in small specimens resulting in high strength (GPa level), high ductility and significant strain hardening, characteristics that have not been observed before in bulk materials. The nanotwinned structure is explained to be a result of the confined volume and large surface area in the small samples. The nucleation mechanism for deformation nanotwins was studied by computational simulations, and it was found that intrinsic nucleation of deformation twinning in Mg can be influence by the correlated nucleation of twinning dislocations, resulting in a nanotwinned structure. A strong size effect on the dislocation behavior in Mg was also discovered through the in situ TEM tests. Through systematic investigation three different size regimes were identified where the strength levels and dislocation plasticity were distinctly different. In the largest samples, three-dimensional dislocation plasticity was found; both the microstructure and the mechanical behavior were similar to those found in bulk. As the sample size decreased, two-dimensional dislocation plasticity became dominant, resulting in limited ductility and localized shear along the basal plane. Finally, in the extremely small samples (≤ 100 nm), multiple slip systems were activated under ultra-high stresses and exceptional ductility was reached. Corresponding high-resolution TEM (HRTEM) observations revealed a significant contribution from non-basal slip systems to the entire plastic deformation in these smallest samples. Presumably, the ultra-high stress decreased the anisotropy of the critical resolved shear stress (CRSS) between different slip systems, resulting in non-basal slip that generated a more homogenous deformation and much better ductility. The in situ TEM experiments were further compared to detailed molecular dynamic simulations. These observations of the reduction of CRSS anisotropy and ultra-high strength plasticity are discussed in light of future processing opportunities for high strength and high ductility structural materials. Lastly, the influence of different grain boundary structures on the deformation mechanisms and the mechanical properties of Mg at small scales was investigated by performing in situ SEM/TEM compression tests on polycrystalline Mg. Using electron backscatter diffraction (EBSD), it was observed that a low angle grain boundary served neither as an effective source of dislocation nucleation nor an effective barrier to mobile dislocations, resulting in localized shear. By comparison, high angle grain boundaries served as effective sources for dislocations and deformation twins, resulting in more stable and sustained plastic deformation. Taken together, the observations and analysis in this thesis give novel and powerful insight into the fundamental plasticity mechanisms in pure Mg. The experiments presented here are both rigorous and creative, generating insightful and powerful conclusions into Mg metallurgy with a high potential impact for light-weighting strategies in structural materials.

Download or read book Magnesium Magnesium Alloys and Magnesium Composites written by Manoj Gupta and published by John Wiley & Sons. This book was released on 2011-03-31 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt: A look at the current and future uses of magnesium-based products and their role in the world's environmental and technological revolution The lightest of all structural metals, having one-fourth the density of steel and two-thirds that of aluminum, magnesium has already been adopted as an alternative construction material in applications as far ranging as automotive and sports equipment, electronics, and space technology. In a world concerned with minimizing the environmental impact of products, the choice of light-weight, energy-saving, and high-performance materials, like magnesium, would seem a small, significant step towards improving life on this planet. Magnesium, Magnesium Alloys, and Magnesium Composites introduces the science and current applications of this important metal, shedding light on the magnesium-based composites developed over the last fifteen years. Chapters include in-depth discussion of: The characteristics of pure magnesium—including atomic properties and crystal structure as well as physical, electrical, and mechanical properties Magnesium alloys—and the effects of the alloying elements, such as aluminum, lithium, copper, nickel, and silicon The properties of magnesium-based composites—and the effects of different types (metallic, ceramic, interconnected, and intermetallic) of reinforcements of varying length (from micron scale to nanometric length) Corrosion aspects of magnesium-based materials Magnesium-based products in medicine, sports equipment, and the automotive, aerospace, and electronics industries Bringing together, for the first time, the science, properties, and technologies relating to the current and future uses of magnesium, this important reference also offers readers a glimpse of a not-too-distant world in which environmental safety and sound engineering are a reality.

Download or read book Structure and Properties of Engineering Materials written by Daniel P. Henkel and published by McGraw-Hill Science, Engineering & Mathematics. This book was released on 2002 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: * An updated look at various engineering materials, including metals, metal alloys, polymers, ceramics and composites * Numerous photomicrographs, and other illustrations, are used to show structural characteristics of various materials * Web site is available

Download or read book Magnesium Alloys as Degradable Biomaterials written by Yufeng Zheng and published by CRC Press. This book was released on 2015-10-09 with total page 601 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnesium Alloys as Degradable Biomaterials provides a comprehensive review of the biomedical applications of biodegradable magnesium and its alloys. Magnesium has seen increasing use in orthopedic and cardiovascular applications over the last decade, particularly for coronary stents and bone implants.The book discusses the basic concepts of biodeg

Download or read book Mechanical Properties of Pure Magnesium and Certain Magnesium Alloys in the Wrought Condition Contd written by and published by . This book was released on 1930 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnesium Alloys written by Frank Czerwinski and published by BoD – Books on Demand. This book was released on 2011-01-14 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists and engineers for decades searched to utilize magnesium, known of its low density, for light-weighting in many industrial sectors. This book provides a broad review of recent global developments in theory and practice of modern magnesium alloys. It covers fundamental aspects of alloy strengthening, recrystallization, details of microstructure and a unique role of grain refinement. The theory is linked with elements of alloy design and specific properties, including fatigue and creep resistance. Also technologies of alloy formation and processing, such as sheet rolling, semi-solid forming, welding and joining are considered. An opportunity of creation the metal matrix composite based on magnesium matrix is described along with carbon nanotubes as an effective reinforcement. A mixture of science and technology makes this book very useful for professionals from academia and industry.

Download or read book Mechanical Properties of Pure Magnesium and Certain Magnesium Alloys in the Wrought Condition written by S. L. Archbutt and published by . This book was released on 1926 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnesium Alloys written by Frank Czerwinski and published by BoD – Books on Demand. This book was released on 2014-11-05 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnesium alloys with their unique physical and chemical properties are important candidates for many modern engineering applications. Their density, being the lowest of all structural metals, makes them the primary choice in global attempts aimed at reducing the weight of transportation vehicles. However, magnesium also creates challenges at certain stages of raw alloy melting, fabrication of net-shape components and their service. The first one is caused by very high affinity of magnesium to oxygen, which requires protective atmospheres increasing manufacturing cost and heavily contributing to greenhouse gas emissions. The second challenge relates to very high corrosivity of liquid magnesium towards materials it contacts. This imposes restrictions on the selection of materials used to contain, transfer or process molten magnesium during manufacturing operations. A mixture of unique benefits and serious challenges of magnesium alloys in solid and liquid states described here makes the book very useful for a broad audience of scientists and engineers from academia and industry.

Download or read book Magnesium Materials written by Yoshiki Oshida and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-02-08 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides an introduction to the topic of magnesium materials for biomedical applications. Additional to the background on magnesium’s physical, chemical and mechanical properties, areas of use, related diseases and pathways for biodegradation will be discussed. Also, an outlook of the future of magnesium material applications will be provided.

Download or read book Mechanical Properties of Pure Magnesium and Certain Magnesium Alloys in the Wrought Condition written by H. J. Tapsell and published by . This book was released on 1928 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnesium written by American Magnesium Corporation and published by . This book was released on 1923 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Engineering Properties of Magnesium Alloys written by Charles Moosbrugger and published by ASM International. This book was released on 2017-11-01 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnesium and magnesium alloys provide unique properties for engineering applications. Magnesium alloys are popular as a structural material because of their combination of light weight and strength. They are desirable for portable tools, appliances, electronic devices, airplanes, space vehicles, and land transportation. This book is written for engineers, scientists, teachers, and students engaged in the design process of material selection and material elimination. While focused on mechanical properties for structural design, the physical properties that are germane to corrosion behavior and electrical applications are represented. Two-thirds of the book is devoted to datasheets for individual alloys which provide a handy quick reference to specific properties and performance. The remainder of the book addresses topics common to all magnesium alloys such as the alloy designation system and product forms. Casting alloys and wrought alloys are compared. The alloy performance at elevated temperature is presented, as are fatigue properties. Finally, a summary of the corrosion behavior of selected alloys is discussed along with how these corrosion mechanisms can be applied for beneficial results.

Download or read book Mechanical Properties of Materials written by Joshua Pelleg and published by Springer Science & Business Media. This book was released on 2012-06-13 with total page 645 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject of mechanical behavior has been in the front line of basic studies in engineering curricula for many years. This textbook was written for engineering students with the aim of presenting, in a relatively simple manner, the basic concepts of mechanical behavior in solid materials. A second aim of the book is to guide students in their laboratory experiments by helping them to understand their observations in parallel with the lectures of their various courses; therefore the first chapter of the book is devoted to mechanical testing. Another aim of the book is to provide practicing engineers with basic help to bridge the gap of time that has passed from their graduation up to their actual involvement in engineering work. The book also serves as the basis for more advanced studies and seminars when pursuing courses on a graduate level. The content of this textbook and the topics discussed correspond to courses that are usually taught in universities and colleges all over the world, but with a different and more modern approach. It is however unique by the inclusion of an extensive chapter on mechanical behavior in the micron and submicron/nanometer range. Mechanical deformation phenomena are explained and often related to the presence of dislocations in structures. Many practical illustrations are provided representing various observations encountered in actual structures of particularly technical significance. A comprehensive list of references at the end of each chapter is included to provide a broad basis for further studying the subject.

Download or read book Magnesium Alloys Containing Rare Earth Metals written by L.L. Rokhlin and published by CRC Press. This book was released on 2003-02-20 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnesium-based alloys containing rare-earth metals are important structural materials, as they combine low density with high-strength properties. This makes them particularly attractive for industry, especially in cases where the low weight of constructions is critical, as in aircraft and space apparatus construction. One of the remarkable feature

Download or read book Mechanical Properties of Pure Magnesium and Certain Magnesium Alloys in the Wrought Condition Mechanical Properties of an electron Alloy written by Herbert J. Tapsell and published by . This book was released on 1930 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Grain Size Dependence of the Mechanical Properties of Magnesium Dititanate written by Jack Andrew Kuszyk and published by . This book was released on 1972 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnesium Technology 2018 written by Dmytro Orlov and published by Springer. This book was released on 2018-01-26 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Magnesium Technology Symposium, the event on which this collection is based, is one of the largest yearly gatherings of magnesium specialists in the world. Papers represent all aspects of the field, ranging from primary production to applications to recycling. Moreover, papers explore everything from basic research findings to industrialization. Magnesium Technology 2017 covers a broad spectrum of current topics, including alloys and their properties; cast products and processing; wrought products and processing; forming, joining, and machining; corrosion and surface finishing; ecology; and structural applications. In addition, there is coverage of new and emerging applications.