Download or read book High Temperature Creep of Polycrystalline MgO and Al sub 2 O sub 3 written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mapping of creep deformation mechanisms for polycrystalline materials has recently been investigated. The mapping process allows each mechanism to appear as a field on the map. Ashby devised a map in which lines of constant strain rate are computed for variable stresses and temperatures at a fixed grain size. Transitions between viscous and non-viscous mechanisms can be readily identified in maps of this type. Recently Langdon proposed a deformation map in which iso-strain rate lines are computed for variable stresses and grain sizes at a fixed temperature. This map is particularly useful for materials in which diffusional creep modes are important, since they are very grain size dependent. This paper is a synopsis of a large number of creep experiments performed at high temperatures on polycrystalline aluminium and magnesium oxides, pure and doped with transition metal impurities, in order to create experimental creep deformation maps.
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1977 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1976 with total page 1118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1983 with total page 1144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Mechanical and Thermal Properties of Ceramics written by J. B. Wachtman and published by . This book was released on 1969 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cities and Their Vital Systems written by Advisory Committee on Technology and Society and published by National Academies Press. This book was released on 1989 with total page 1298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cities and Their Vital Systems asks basic questions about the longevity, utility, and nature of urban infrastructures; analyzes how they grow, interact, and change; and asks how, when, and at what cost they should be replaced. Among the topics discussed are problems arising from increasing air travel and airport congestion; the adequacy of water supplies and waste treatment; the impact of new technologies on construction; urban real estate values; and the field of "telematics," the combination of computers and telecommunications that makes money machines and national newspapers possible.
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impurity Effects on the Creep of Polycrystalline Magnesium and Aluminum Oxides at Elevated Temperatures Technical Progress Report December 19 1975 December 18 1976 written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The research described covers work on: (1) Viscous creep of fine-grained MgO doped with iron. (2) The effects of residual fluorine on diffusional creep and grain growth kinetics in polycrystalline MgO. (3) The effects of transition metal impurities and grain size on the creep of polycrystalline Al2O3. (4) The construction of creep deformation maps for polycrystalline MgO and Al2O3, pure and doped with iron. Some of the significant findings include: (1) Three well defined regimes have been identified for the diffusional creep of polycrystalline MgO and Al2O3, pure and doped with transition metal impurities: (1) cation grain boundary diffusion (2) cation lattice diffusion, (3) anion grain boundary diffusion. (2) Creep deformation maps have been developed for ambipolar diffusional creep and applied to pure and doped MgO and Al2O3. (3) Iron in solid solution enhances grain boundary diffusivities (cation and anion) in polycrystalline MgO in addition to magnesium lattice diffusion via the creation of cation lattice vacancies. (4) Residual fluorine in polycrystalline MgO leads to enhanced magnesium lattice and grain boundary diffusivities and hence to increased diffusional creep and grain growth rates. (5) Viscous Coble (diffusional) creep, which is rate-limited by oxygen grain boundary diffusion, has been identified in reduced iron-doped (2 cation percent) and double-doped (1/4 percent Mn and 1/4 percent Ti) polycrystalline Al2O3.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modern Ceramic Engineering written by David W. Richerson and published by CRC Press. This book was released on 2018-04-27 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the publication of its Third Edition, there have been many notable advances in ceramic engineering. Modern Ceramic Engineering, Fourth Edition serves as an authoritative text and reference for both professionals and students seeking to understand key concepts of ceramics engineering by introducing the interrelationships among the structure, properties, processing, design concepts, and applications of advanced ceramics. Written in the same clear manner that made the previous editions so accessible, this latest edition has been expanded to include new information in almost every chapter, as well as two new chapters that present a variety of relevant case studies. The new edition now includes updated content on nanotechnology, the use of ceramics in integrated circuits, flash drives, and digital cameras, and the role of miniaturization that has made our modern digital devices possible, as well as information on electrochemical ceramics, updated discussions on LEDs, lasers and optical applications, and the role of ceramics in energy and pollution control technologies. It also highlights the increasing importance of modeling and simulation.
Download or read book Treatise on Geophysics written by and published by Elsevier. This book was released on 2015-04-17 with total page 5604 pages. Available in PDF, EPUB and Kindle. Book excerpt: Treatise on Geophysics, Second Edition, is a comprehensive and in-depth study of the physics of the Earth beyond what any geophysics text has provided previously. Thoroughly revised and updated, it provides fundamental and state-of-the-art discussion of all aspects of geophysics. A highlight of the second edition is a new volume on Near Surface Geophysics that discusses the role of geophysics in the exploitation and conservation of natural resources and the assessment of degradation of natural systems by pollution. Additional features include new material in the Planets and Moon, Mantle Dynamics, Core Dynamics, Crustal and Lithosphere Dynamics, Evolution of the Earth, and Geodesy volumes. New material is also presented on the uses of Earth gravity measurements. This title is essential for professionals, researchers, professors, and advanced undergraduate and graduate students in the fields of Geophysics and Earth system science. Comprehensive and detailed coverage of all aspects of geophysics Fundamental and state-of-the-art discussions of all research topics Integration of topics into a coherent whole
Download or read book Impurity Effects on the Creep of Polycrystalline Magnesium and Aluminum Oxides at Elevated Temperatures Technical Progress Report December 19 1974 December 18 1975 written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Work is reported on: 1. Viscous creep of fine-grained MgO doped with iron. 2. The effects of transition metal impurities and grain size on the creep of polycrystalline Al2O3. 3. The non-viscous creep of large grain size MgO and Al2O3, pure and doped with transition metal impurities. 4. Stress relaxation tests on polycrystalline MgO and Al2O3, pure and doped with transition metal impurities. 5. The construction of creep deformation maps for polycrystalline MgO and Al2O3, pure and doped with iron. 6. Preliminary studies on the effect of grain size on the creep of polycrystalline mullite. Some of the significant findings include: 1. Power law creep (N approx. 3) in polycrystalline MgO is independent of iron doping, grain size, and oxygen partial pressure. 2. Three well-defined regimes have been identified for the diffusional creep of polycrystalline MgO and Al2O3, pure and doped with transition metal impurities: (1) cation grain boundary diffusion (2) cation lattice diffusion, (3) anion grain boundary diffusion. 3. Coble diffusional creep, which is rate-limited by oxygen grain boundary diffusion, has been identified in reduced iron-doped (2 cation percent) and double doped (1/4 percent Mn and 1/4 percent Ti) polycrystalline Al2O3. Stress relaxation deformation tests can be used to (1) identify transitions between viscous and non-viscous deformation, and (2) achieve high stresses (approx. 103 kg/cm2) and strain rates (1h−1) without fracture. Good agreement exists between dead-load creep and stress relaxation studies in four point bending. (auth).
Download or read book Government Reports Annual Index Keyword A L written by and published by . This book was released on 1976 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt:
