The Mechanical Properties of Tantalum with Special Reference to the Ductile-brittle Transition PDF Download
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Author: G. Abowitz
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 134
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Book Description
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.
Author: G. Abowitz
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 134
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Book Description
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.
Author: M. A. Adams
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 0
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Book Description
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.
Author: G. T. Murray
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 0
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Book Description
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.
Author: G. T. Murray
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 0
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Book Description
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. (Author).
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1416
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Book Description
Author:
Publisher:
ISBN:
Category : Dislocations in metals
Languages : en
Pages : 530
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Book Description
Author: United States. Wright Air Development Division
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 276
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Book Description
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.
Author: Albert G. Imgram
Publisher:
ISBN:
Category : Heat resistant alloys
Languages : en
Pages : 80
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Book Description
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).
Author: National Physical Laboratory (Great Britain). Metallurgy Division
Publisher:
ISBN:
Category : Metallography
Languages : en
Pages : 354
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Book Description
Author: Donna J. Tate
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 262
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Book Description
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.
