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Author : F. R. Schwartzberg
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.3/5 (91 download)
Download or read book Ductile-brittle Transition in the Refractory Metals written by F. R. Schwartzberg and published by . This book was released on 1959 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : George T. Hahn
Publisher :
ISBN 13 :
Total Pages : 62 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Effects of Solutes on the Ductile-to-brittle Transition of Refractory Metals written by George T. Hahn and published by . This book was released on 1962 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: There appear to be two ways in which interstitials promote brittle behavior in Groups V-A and VI-A refractory metals: (1) By locating at the grain boundaries in the form of segregates of precipitates, promoting grain-boundary rupture and crack initiation; and (2) In solid solution by inhibiting dislocation movement and reducing the resistance to crack propagation. Both embrittling effects operate in Group VI-A metals; whereas, only the latter is significant in the Group V-A at the levels of purity currently achieved. The problem of reducing the low-temperature brittleness of Group V-A metals is readily solved through the purity route. Purification of Group V-A metals to interstitial levels well below the solubility limits may be readily accomplished either in the initial purification of the base metal or during melting or consolidation. There are three possible routes to solving the problem of the embrittling effect of interstitials on the Group VI-A metals: (1) the purity route, (2) through working, and (3) through alloying (thermodynamically through strong scavengers, by additions which modify the electron bonding, and via grain-refining dispersions). (Author).
Author : S. Weissmann
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (227 download)
Download or read book Ductile-brittle Transition in Refractory Metals written by S. Weissmann and published by . This book was released on 1964 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The distribution of locked-in, residual strains in lightly compressed tungsten crystals with residual strains up to 0.45% has been determined by measuring the changes of interatomic spacings, delta d/d, in different crystallographic directions. It is shown that the delta d/d values measured by the divergent beam method actually represent the resolved elements of an elastic strain tensor which can be described in terms of the three principal strains. With the aid of the principal strains determined it was possible to infer the distribution of the centers of inhomogeneous strains, such as dislocations, which keep the residual elastic strains locked in the crystal. Thus the slip activity in the microstrain region is quantitatively determined. The results obtained are in good agreement with those predicted on the basis of the maximum resolved shear stress operating on potential slip planes. When the centers of inhomogeneous strains become so numerous that they affect the precision of the strain analysis, local broadening of the X-ray line profile occurs. Experimental techniques and results defining sensitively incipient line broadening are presented. (Author).
Author : Walter D. Wilkinson
Publisher :
ISBN 13 :
Total Pages : 380 pages
Book Rating : 4.:/5 (42 download)
Download or read book Properties of Refractory Metals written by Walter D. Wilkinson and published by . This book was released on 1969 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Charles L. Younger
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (31 download)
Download or read book Effect of Reactor Irradiation on Ductile-brittle Transition and Stress-strain Behavior of Tungsten written by Charles L. Younger and published by . This book was released on 1970 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert Isaac Jaffee
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.3/5 (91 download)
Download or read book A Brief Review of Refractory Metals written by Robert Isaac Jaffee and published by . This book was released on 1959 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas Edwin Tietz
Publisher :
ISBN 13 :
Total Pages : 440 pages
Book Rating : 4.3/5 (91 download)
Download or read book Behavior and Properties of Refractory Metals written by Thomas Edwin Tietz and published by . This book was released on 1965 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A. Fourdeux
Publisher :
ISBN 13 :
Total Pages : 148 pages
Book Rating : 4.:/5 (227 download)
Download or read book Surface and Interfacial Effects in Relation to Brittleness in Refractory Metals written by A. Fourdeux and published by . This book was released on 1966 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental program was conducted to compare the mechanical properties of high purity and impure niobium and the mechanical properties of high purity tungsten, both in polycrystalline and single crystal forms. Slip in high purity niobium takes place on the (110) planes in the (111) directions and yielding is governed by the conservative motion of jogs in screw dislocations, rather than by the unlocking of dislocations from the interstitial impurity cloud. Between the upper and lower yield points there is a sudden generation of a large number of dislocations by double cross-slip mechanism. High purity niobium has greater ductility, higher uniform elongation, increased work hardening, but lower strength than impure niobium. Further, it has a yield point in the temperature range 20 C to 800 C. Appreciable ductility can be achieved at room temperature in commercially pure tungsten, but the mechanical properties are strongly orientation dependent. The ductile-to-brittle transition temperature is about 100 C higher sintered material than in melted material which is of coarser gran size and probably higher purity. Very high purity polycrystalline tungsten was found to show some ductility down to -196 C in the recrystallization condition. However, the fracture process is controlled to a considerable extent by grain boundaries in the temperature range +200 C to -196 C. (Author).
Author : G. Mervin Ault
Publisher :
ISBN 13 :
Total Pages : 74 pages
Book Rating : 4.:/5 (45 download)
Download or read book A Decade of Progress in Refractory Metals written by G. Mervin Ault and published by . This book was released on 1966 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : E. M. Savitskii
Publisher : Springer Science & Business Media
ISBN 13 : 1468415727
Total Pages : 296 pages
Book Rating : 4.4/5 (684 download)
Download or read book Physical Metallurgy of Refractory Metals and Alloys written by E. M. Savitskii and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: The principal reasons which induced the authors to write this book and the features of the book are set forth in the preface to the Russian edition. That section of the science of metals which in Russian is called "metallovedenie" or the "physical chemistry of metals" is generally referred to in scientific and technical literature published in the English language by the term "physical metallurgy." These concepts are much broader than the term" metallography," used in the scientific and technical literature of various countries, and applied solely to research on the interrelationships of the structure and proper ties of metals and alloys. Each science must have its own subject and its own method of research. Certainly, all specialists will agree that metals and alloys, including their solid solutions, mechanical mix tures, and metallic compounds, form the subject of "physical metallurgy" or "physical chemis try of metals." The aim of this science. is to produce a theory and to elucidate the experimental relationships which ought finally to make it possible to calculate quantitatively alloys Of given properties for any working conditions and parameters.
Author :
Publisher :
ISBN 13 :
Total Pages : 1048 pages
Book Rating : 4.:/5 (318 download)
Download or read book Refractory Metals and Alloys written by and published by . This book was released on 1966 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. Semchyshen
Publisher :
ISBN 13 :
Total Pages : 468 pages
Book Rating : 4.3/5 (91 download)
Download or read book Refractory Metals and Alloys II. written by M. Semchyshen and published by . This book was released on 1963 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : I. Machlin
Publisher : Springer Science & Business Media
ISBN 13 : 1468491202
Total Pages : 493 pages
Book Rating : 4.4/5 (684 download)
Download or read book Refractory Metal Alloys Metallurgy and Technology written by I. Machlin and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication documents Proceedings of the Symposium on Metal lurgy and Technology of Refractory Metal Alloys, held in Washington, D.C. at the Washington Hilton Hotel on April 25-26, 1968, under sponsorship of the Refractory Metals Committee, Institute of Metals Division, of the Metallurgical Society of AIME, and the National Aeronautics and Space Administration. The Symposium presented critical reviews of selected topics in refractory metal alloys, thereby contributing to an in-depth understanding of the state-of-the-art, and establishing a base line for further research, development, and application. This Symposium is fifth in a series of conferences on refractory metals, sponsored by the Metallurgical Society of AlME. Publications issuing from the conferences are valuable technical and historical source books, tracing the evolution of refractory metals from early laboratory alloying studies to their present status as useful engineering materials. Refractory metals are arbitrarily defined by melting point. A 0 melting temperature of over 3500 F was selected as the minimum for this Symposium, thus excluding chromium and vanadium, which logically could be treated with other refractory metals in Groups VA and VIA of the periodic table. The Refractory Metals Committee is planning reviews of chromium and vanadium in subsequent conferences.
Author : Harris M. BURTE
Publisher :
ISBN 13 :
Total Pages : 45 pages
Book Rating : 4.:/5 (227 download)
Download or read book REFRACTORY METALS AN ASSESSMENT. written by Harris M. BURTE and published by . This book was released on 1965 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The refractory metals (columbium, molybdenum, tantalum, tungsten) and their alloys offer attractive potential as metallic materials for high temperature applications. Their general characteristics (e.g., high melting point, ductile-brittle transition, oxidation characteristics) are discussed in relation to a critical assessment of the feasibility of their use in current and future aerospace applications. Coatings for oxidation protection, fabrication, and joining, are shown to be areas of technology limiting the use of these materials, and therefore requiring further efforts. In spite of the current limitations, the high temperature capability is being utilized and for some future applications, improvements in strength, ductility, and coating characteristics are expected to increase reliability and capability. (Author).
Author : Peter L. Raffo
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (31 download)
Download or read book Yielding and Fracture in Tungsten and Tungsten-rhenium Alloys written by Peter L. Raffo and published by . This book was released on 1968 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 830 pages
Book Rating : 4.3/5 (91 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1970 with total page 830 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.
Author : F. C. Holden
Publisher :
ISBN 13 :
Total Pages : 102 pages
Book Rating : 4.3/5 (91 download)
Download or read book U.S. Government Metalworking Processes and Equipment Program written by F. C. Holden and published by . This book was released on 1964 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: A summary is given of the status of the various contracts involved in the U.S. Government's Metalworking Processes and Equipment Program. (Author).
