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Metallography Of Dispersion Hardened Alloys And Its Relation To Creep Resistance
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Book Synopsis Metallography of Dispersion Hardened Alloys and Its Relation to Creep Resistance by : Ian Sydney Brammar
Download or read book Metallography of Dispersion Hardened Alloys and Its Relation to Creep Resistance written by Ian Sydney Brammar and published by . This book was released on 1963 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Techniques are described for the preparation of thin foils of sintered alumina-aluminum alloys (S.A.P.) for study in the electron microscope. The morphology of the dispersed phase and its relation to the microstructure have been examined. The results are discussed with reference to the current theories of creep of S.A.P. (R).
Book Synopsis A Survey of Dispersion Strengthening of Metals and Alloys ; [summary Technical Report by : Rointan Framroze Bunshah
Download or read book A Survey of Dispersion Strengthening of Metals and Alloys ; [summary Technical Report written by Rointan Framroze Bunshah and published by . This book was released on 1959 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dispersion Strengthening of Metals by : Facundo Rolf Morral
Download or read book Dispersion Strengthening of Metals written by Facundo Rolf Morral and published by . This book was released on 1977 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Evaluation of Power Law Breakdown in Metals, Alloys, Dispersion Hardened Materials and Compounds by :
Download or read book An Evaluation of Power Law Breakdown in Metals, Alloys, Dispersion Hardened Materials and Compounds written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Creep at high stresses often produces strain rates that exceed those that would be predicted by a power law relationship. In this paper, we examine available high stress creep data for pure metals, solid solution alloys, dispersion strengthened powder metallurgy materials and compounds for power law breakdown (PLB). The results show that, if PLB is observed, then the onset of PLB is generally observed at about [epsilon]/D{sub eff} = 1013 m−2, where D{sub eff} is the effective diffusion coefficient incorporating lattice and dislocation pipe diffusion. The common origins of PLB for the various systems studied can be found in the production of excess vacancies by plastic deformation. Anomalous behavior in two pure metals (nickel and tungsten) and a solid solution alloy (Fe-25Cr and Fe-26Cr-1Mo) has been analyzed and provides insight into this excess vacancy mechanism. In metal systems, the onset of PLB is related to a change in the nature of the subgrain structure developed. In the PLB region, subgrains become imperfect containing dislocation tangles adjacent to the sub-boundary, and dislocation cells are evident. The dislocation tangles and cells are the source of excess vacancies and increase the creep rate above that predicted from power law creep. If subgrains do not form then PLB is not observed. In solid solution alloys, in which the dominant deformation resistance results from the interaction of solute atoms with moving dislocations, excess vacancies influence the diffusion of these solute atoms. PLB is not observed in many systems. This is attributed either to the presence of a high equilibrium vacancy concentration (because of a low activation energy for vacancy formation) or to the inability to form subgrains.
Book Synopsis Fundamentals of Creep in Metals and Alloys by : Michael E. Kassner
Download or read book Fundamentals of Creep in Metals and Alloys written by Michael E. Kassner and published by Elsevier. This book was released on 2004-04-06 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: * Numerous line drawings with consistent format and units allow easy comparison of the behavior of a very wide range of materials * Transmission electron micrographs provide a direct insight in the basic microstructure of metals deforming at high temperatures * Extensive literature review of over 1000 references provide an excellent reference document, and a very balanced discussion Understanding the strength of materials at a range of temperatures is critically important to a huge number of researchers and practitioners from a wide range of fields and industry sectors including metallurgists, industrial designers, aerospace R&D personnel, and structural engineers. The most up-to date and comprehensive book in the field, Fundamentals of Creep in Metals and Alloys discusses the fundamentals of time-dependent plasticity or creep plasticity in metals, alloys and metallic compounds. This is the first book of its kind that provides broad coverage of a range of materials not just a sub-group such as metallic compounds, superalloys or crystals. As such it presents the most balanced view of creep for all materials scientists. The theory of all of these phenomena are extensively reviewed and analysed in view of an extensive bibliography that includes the most recent publications in the field. All sections of the book have undergone extensive peer review and therefore the reader can be sure they have access to the most up-to-date research, fully interrogated, from the world’s leading investigators. · Numerous line drawings with consistent format and units allow easy comparison of the behavior of a very wide range of materials· Transmission electron micrographs provide a direct insight in the basic microstructure of metals deforming at high temperatures· Extensive literature review of over 1000 references provide an excellent reference document, and a very balanced discussion
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781719975834 Total Pages :26 pages Book Rating :4.9/5 (758 download)
Book Synopsis Creep and Tensile Properties of Several Oxide-Dispersion-Strengthened Nickel-Base Alloys at 1365 K by : National Aeronautics and Space Adm Nasa
Download or read book Creep and Tensile Properties of Several Oxide-Dispersion-Strengthened Nickel-Base Alloys at 1365 K written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-06 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The tensile properties at room temperature and at 1365 K and the tensile creep properties at low strain rates at 1365 K were measured for several oxide-dispersion-strengthened (ODS) alloys. The alloys examined included ODS Ni, ODS Ni-20Cr, and ODS Ni-16Cr-Al. Metallography of creep tested, large grain size ODS alloys indicated that creep of these alloys is an inhomogeneous process. All alloys appear to possess a threshold stress for creep. This threshold stress is believed to be associated with diffusional creep in the large grain size ODS alloys and normal dislocation motion in perfect single crystal (without transverse low angle boundaries) ODS alloys. Threshold stresses for large grain size ODS Ni-20Cr and Ni-16Cr-Al type alloys are dependent on the grain aspect ratio. Because of the deleterious effect of prior creep on room temperature mechanical properties of large grain size ODS alloys, it is speculated that the threshold stress may be the design limiting creep strength property. Wittenberger, J. D. Glenn Research Center NASA-TN-D-8422, E-8882 RTOP 505-01
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Book Synopsis Precipitation Hardening by : J. W. Martin
Download or read book Precipitation Hardening written by J. W. Martin and published by Elsevier. This book was released on 2016-06-03 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precipitation Hardening
Book Synopsis Micromechanisms in Particle-Hardened Alloys by : J. W. Martin
Download or read book Micromechanisms in Particle-Hardened Alloys written by J. W. Martin and published by Cambridge University Press. This book was released on 1980-07-10 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was first published in 1980. A great number of metallic materials in practical use owe their strength to the presence in their microstructure of particles of a hard precipitated phase. The text emphasises the importance of scientific rather than empirical methods in attempting to develop particle-hardened alloys. The author progresses from an elementary knowledge of metallurgy to theories relating to the deformation and fracture of alloys of this type. He also discusses the use of such theories to describe observations on both model materials and practical metals. After a discussion of the microstructures of these alloys, how they form and how to describe them quantitatively, their deformation and fracture behaviour at both low and elevated temperatures are examined.
Book Synopsis Metallography of S.a.p. Alloys and Its Relation to Creep Resistance by : I. S. BRAMMER
Download or read book Metallography of S.a.p. Alloys and Its Relation to Creep Resistance written by I. S. BRAMMER and published by . This book was released on 1964 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structures of several different S.A.P. alloys (sintered aluminium-alumina powder metallurgy alloys) have been investigated by means of transmission electron metallography. The dispersed aluminium oxide has been shown to be alpha-Al2O3. The aluminium matrix of all the samples examined will not undergo grain growth until the metal has been deformed greater than 98% reduction in thickness. It is suggested that the orientation of the oxide plates may effect the grain growth. Specimens have been examined after creep tests and stress rupture tests but no significant structural changes can be observed. It is suggested that the creep strength is due to the complete stability of the dispersed oxide phase up to the melting point of the matrix and also to the small stable grain size of the matrix. Heat treatments carried out above the melting point of the matrix have shown that a massive honeycomb network of oxide is produced which may explain the creep results of others workers obtained above the melting point of the aluminium. (Author).
Book Synopsis Mechanical Properties of Metallic Composites by : Shojiro Ochiai
Download or read book Mechanical Properties of Metallic Composites written by Shojiro Ochiai and published by CRC Press. This book was released on 1993-12-17 with total page 823 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides coverage of dispersion-hardened and fibre-reinforced alloys, addressing principal mechanisms, processing and applications. Mechanical behaviour based on dislocation theory and elastic-plastic mechanics is dealt with and data on advanced composites are provided.
Book Synopsis The Creep and Aging Response of a Rapidly Solidified Al-Fe-V-Si Alloy by : Robert J. Lewis
Download or read book The Creep and Aging Response of a Rapidly Solidified Al-Fe-V-Si Alloy written by Robert J. Lewis and published by . This book was released on 1990 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Creep Behavior of Advanced Materials for the 21st Century by : Rajiv S. Mishra
Download or read book Creep Behavior of Advanced Materials for the 21st Century written by Rajiv S. Mishra and published by Minerals, Metals, & Materials Society. This book was released on 1999 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume reviews and updates the creep behavior of advanced materials, including ceramic and metal-matrix composites, laminated materials, nanostructured materials, advanced intermetallics, and advanced dispersion strengthened materials. This collection from the 1999 TMS Annual Meeting & Exhibition also covers the influence of microstructure on various aspects of creep and how this knowledge can be used to design more creep resistant materials.
Book Synopsis Diffusional Creep and Creep Degradation in the Dispersion-strengthened Alloy TD-NiCr by : John Daniel Whittenberger
Download or read book Diffusional Creep and Creep Degradation in the Dispersion-strengthened Alloy TD-NiCr written by John Daniel Whittenberger and published by . This book was released on 1972 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dispersoid-free regions were observed in TD-NiCr (Ni-20Cr-2ThO2) after slow strain rate testing in air from 1145 to 1590 K. Formation of the dispersoid-free regions appears to be the result of diffusional creep. The net effect of this creep is the degradation of TD-NiCr to a duplex microstructure. Degradation is further enhanced by the formation of voids and integranular oxidation in the thoria-free regions. These regions apparently provided sites for void formation and oxide growth since the strength and oxidation resistance of Ni-20Cr is much less than Ni-20Cr-2ThO2. This localized oxidation does not appear to reduce the static load bearing capacity of TD-NiCr since long stress rupture lives were observed even with heavily oxidized microstructures. But this oxidation does significantly reduce the ductility and impact resistance of the material. Dispersoid-free bands and voids were also observed for two other dispersion strengthened alloys, TD-NiCrAl and IN-853. Thus, it appears that diffusional creep is charactertistic of dispersion-strengthened alloys and can play a major role in the creep degradation of these materials.
Book Synopsis Technical Abstract Bulletin by : Defense Documentation Center (U.S.)
Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1961-10 with total page 1540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory of Creep of Dispersion-hardened Alloys by : Johannes Weertman
Download or read book Theory of Creep of Dispersion-hardened Alloys written by Johannes Weertman and published by . This book was released on 1958 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Government Research Reports by :
Download or read book U.S. Government Research Reports written by and published by . This book was released on 1964 with total page 1416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
