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The Mechanical Properties Of Tantalum With Special Reference To The Ductile Brittle Transition
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Book Synopsis The Mechanical Properties of Tantalum with Special Reference to the Ductile-brittle Transition by : G. Abowitz
Download or read book The Mechanical Properties of Tantalum with Special Reference to the Ductile-brittle Transition written by G. Abowitz and published by . This book was released on 1963 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The tensile behavior of dilute Ta-H and Ta-Mo alloys was studied as a function of alloying addition, grain size and test temperature at a constant strain rate. The results are interpreted in terms of the parameters sigma sub-i and k sub-y of the Petch equation. For Ta-H alloys at 25 C sigma sub-i was independent of hydrogen content whereas k sub-y increased with hydrogen content. Deformation twinning was not observed in Ta-H alloys either at 25 C or at -196 C. Dilute additions of Mo to Ta at 25 C resulted in an increase in k sub-y whereas sigma sub-i was unaffected. Twinning was observed at -196 C but not at 25 C.A large increase in ductility accompanied twinning.
Book Synopsis The Mechanical Properties of Tantalum with Special Reference to the Ductile-brittle Transition by : M. A. Adams
Download or read book The Mechanical Properties of Tantalum with Special Reference to the Ductile-brittle Transition written by M. A. Adams and published by . This book was released on 1961 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tensile tests were made on specimens of commercial Ta of different grain-sizes, and the variation of lower yield stress with grain-size 2d was used to assess the effect of temperature (23, -78 and -196 deg C) and strain-rate (0.0019 and 0.0996 sec. at each temperature) on the parameters sigma sub i and k sub y in a Petch type equation. The results indicate that the sensitivity of the yield strength to temperature and strain-rate arises almost entirely from the effects that these variables produce on sigma sub i. The high resistance of Ta to brittleness has been confirmed, all of the specimens showing pronounced necking and predominantly fibrous fractures; on the fracture surfaces of the coarser grained specimens tested at -196 deg C (both strain rates) some cleavage facets were observed. The greater ductility of Ta relative to Nb, Mo, and mild steel is attributed to a low value of k sub y and a high value of shear modulus.
Book Synopsis The Mechanical Properties of Tantalum with Special Reference to the Ductile-brittle Transition by : G. T. Murray
Download or read book The Mechanical Properties of Tantalum with Special Reference to the Ductile-brittle Transition written by G. T. Murray and published by . This book was released on 1963 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lower yield stress-grain size relationship was studied in tantalum for two compositions; one consisting of a total interstitial at content of 72 ppm with the major constituent being oxygen, and the other containing primarily carbon (116 ppm) in which part of the carbon existed In the form of a finely dispersed carbide precipitate. These results were compared to those obtained earlier (1) on commercial tantalum containing a total interstitial content of about 200 ppm. The commercial tantalum exhibited significantly higher yield and flow stresses and correspondingly higher ri values. The carbon containing material showed the lowest yield stresses primarily because of its lower oxygen content. It was concluded that oxygen is much more effective than carbon in restricting dislocation movement. The effect of the carbide precipitate was to increase the work-hardening rate. The flow stresses, however, even in the presence of the carbide phase were lower than those observed for commercial tantalum.
Book Synopsis The Mechanical Properties of Tantalum with Special Reference to the Ductile-brittle Transition by : M. A. Adams
Download or read book The Mechanical Properties of Tantalum with Special Reference to the Ductile-brittle Transition written by M. A. Adams and published by . This book was released on 1961 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tensile tests were made on specimens of commercial Ta of different grain-sizes, and the variation of lower yield stress with grain-size 2d was used to assess the effect of temperature (23, -78 and -196 deg C) and strain-rate (0.0019 and 0.0996 sec. at each temperature) on the parameters sigma sub i and k sub y in a Petch type equation. The results indicate that the sensitivity of the yield strength to temperature and strain-rate arises almost entirely from the effects that these variables produce on sigma sub i. The high resistance of Ta to brittleness has been confirmed, all of the specimens showing pronounced necking and predominantly fibrous fractures; on the fracture surfaces of the coarser grained specimens tested at -196 deg C (both strain rates) some cleavage facets were observed. The greater ductility of Ta relative to Nb, Mo, and mild steel is attributed to a low value of k sub y and a high value of shear modulus.
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:
Download or read book Papers written by and published by . This book was released on 1963 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Review of the Air Force Materials Research and Development Program by : United States. Wright Air Development Division
Download or read book A Review of the Air Force Materials Research and Development Program written by United States. Wright Air Development Division and published by . This book was released on 1954 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review of the research and development work sponsored in the field of materials and processes over the past decade is presented. Abstracts of WADC Technical Reports for the period 1 July 1951 to 30 June 1953 are included. A summary of Technical Reports published in the areas of metallurgy, textiles, petroleum products, structural materials, rubbers, plastics, packaging, protective treatments, analysis and measurements are included also.
Book Synopsis The Effect of Fabrication History and Microstructure on the Mechanical Properties of Refractory Metals and Alloys by : Albert G. Imgram
Download or read book The Effect of Fabrication History and Microstructure on the Mechanical Properties of Refractory Metals and Alloys written by Albert G. Imgram and published by . This book was released on 1963 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the present knowledge concerning the relationship among fabrication history, metallurgical structure, and the mechanical properites of the refractory metals columbium, tantalum, bolybdenum, and tungsten, and their alloys. These are the refractory metals currently reveiveing the most attention for aerospace applications, and are therefore the materials considered in this survey. The report is organized into three main sections, titled ''Fabrication'', ''Microstructure and Alloying'', and ''Interstitial Impurities''. The data presented were selected as those which best illustrate the topics discussed. Descriptions of the metaljurgical principles involved are included. Suggestions for optimizing mechanical properties by controlling metallurgical structure are made where possible. (Author).
Book Synopsis The Relation Between the Structure and Mechanical Properties of Metals by : National Physical Laboratory (Great Britain). Metallurgy Division
Download or read book The Relation Between the Structure and Mechanical Properties of Metals written by National Physical Laboratory (Great Britain). Metallurgy Division and published by . This book was released on 1963 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Review of the Air Force Materials Research and Development Program by : Donna J. Tate
Download or read book A Review of the Air Force Materials Research and Development Program written by Donna J. Tate and published by . This book was released on 1962 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: These reports cover basic and applied research in the materials area being conducted by the Metals and Ceramics, Non-metallic Materials, Physics, Manufacturing Technology and Applications Laboratories of the Directorate of Materials and Processes.
Book Synopsis Physical and Mechanical Properties of Tantalum by : H. R. Ogden
Download or read book Physical and Mechanical Properties of Tantalum written by H. R. Ogden and published by . This book was released on 1959 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Review of the Air Force Materials Research and Development Program by : Air Force Materials Laboratory (U.S.)
Download or read book A Review of the Air Force Materials Research and Development Program written by Air Force Materials Laboratory (U.S.) and published by . This book was released on 1964 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Technical reports published by the Air Force Materials Laboratoy during the period 1 July 1962 - 30 June 1963 are abstracted herein. Reports on reseqrch conducted by the Air Force Materials Laboratory personnel as well as that conducted on contract are included. These reports cover basic and applied research in the materials area being conducted by the Metals and Ceramics Division, Non-metallic Materials Division, Materials Physics Division, Manufacturing Technology Division, and Materials Applications Division of the Air Force Materials Laboratory.
Book Synopsis Survey of Properties of T-111 (Tantalum-8 Tungsten-2 Hafnium) by : Paul E. Moorhead
Download or read book Survey of Properties of T-111 (Tantalum-8 Tungsten-2 Hafnium) written by Paul E. Moorhead and published by . This book was released on 1970 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 1971 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 1964 with total page 1148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reports Received by Division of Technical Information Extension by : U.S. Atomic Energy Commission. Division of Technical Information
Download or read book Reports Received by Division of Technical Information Extension written by U.S. Atomic Energy Commission. Division of Technical Information and published by . This book was released on with total page 914 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Second Status Report of the U. S. Government Metalworking Processes and Equipment Program by : F. C. Holden
Download or read book Second Status Report of the 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 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
