Slow Strain-rate Embrittlement in Tantalum Due to Oxygen and Selected Experiments in the Vanadium-oxygen and Tantalum-nitrogen Systems PDF Download
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Author: Ana Estela Diaz
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 190
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Author: Ana Estela Diaz
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 190
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Author: R. E. Reed-Hill
Publisher:
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Category :
Languages : en
Pages : 35
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The phenomena of slow strain-rate embrittlement was studied in three metal-interstitial systems, tantalum-oxygen, vanadium-oxygen and tantalum-nitrogen. The embrittlement of tantalum by oxygen was investigated on specimens containing four levels of oxygen -- 0.33, 0.50, 0.85 and1.30 atomic percent. All of the compositions showed embrittlement between 500-1000K in specimens deformed at epsilon = 8.8 x 10 to the 4th power sec to the minus one power. Associated with the embrittling phenomenon, and occurring in the same temperature range where the ductility is dropping, and three dynamic strain-aging effects: (a) a yield stress plateau from 300-600K, (b) serrated yielding from 453-600K and an increasing work hardening rate from 300-600K; Scanning electron microscope studies show that failures were by microvoid coalescence at low temperatures changing to a predominantly intergranular mode in the embrittlement range. Study of the vanadium-oxygen system also showed an embrittlement region between 600-875K. This embrittlement was accompanied by a yield stress plateau between 400-600K, an increasing work hardening rate between 300-650K and serrated yielding from 525K to 650K. A high level of titanium impurity limited testing to low oxygen concentrations. Tests on the tantalum-nitrogen system concluded that nitrogen did not produce slow strain-rate embrittlement in this metal although it served as a potent room temperature strengthener. The interval in which embrittlement is expected in this metal is at a sufficiently high temperature that dynamic recovery and sofening take place. (Author).
Author: A. E. Diaz
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Category :
Languages : en
Pages : 6
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Category : Aeronautics
Languages : en
Pages : 744
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Author: W. H. Shafer
Publisher: Springer
ISBN: 9780306409912
Category : Science
Languages : en
Pages : 328
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Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing. house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 25 (thesis year 1980) a total of 10,308 theses titles from 27 Canadian and 214 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. While Volume 25 reports theses submitted in 1980, on occasion, certain universities do report theses submitted in previous years but not reported at the time.
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Category : Power resources
Languages : en
Pages : 1510
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Category : Corrosion and anti-corrosives
Languages : en
Pages : 596
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Category : Science
Languages : en
Pages : 1052
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Author:
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Category : Metallurgy
Languages : en
Pages : 1156
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Author: Nickolas J. Themelis
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 180
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