Evidence for Slow Strain-Rate Embrittlement in Tantalum Due to Oxygen PDF Download
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Author: A. E. Diaz
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
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Book Description
Author: A. E. Diaz
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
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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:
ISBN:
Category :
Languages : en
Pages : 35
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Book Description
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:
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Category : Military research
Languages : en
Pages : 604
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1048
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Author: Minerals, Metals and Materials Society. Fall Meeting
Publisher: Minerals, Metals, & Materials Society
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 338
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Book Description
This aims to be the most complete volume available on the developing technology of refractory metals and alloys for high strain rate applications. Processing, testing and evaluation procedures for this group of specialized materials are thoroughly examined. Added emphasis is placed on high strain rate processing, dynamic compaction and forging, microstructure, texture, composition and loading rate effects on deformation and fracture.
Author:
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Category : Metallurgy
Languages : en
Pages : 1516
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Author:
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Category : Aeronautics
Languages : en
Pages : 922
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Author:
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ISBN:
Category : Gases in metals
Languages : en
Pages : 588
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Author: E. Chen
Publisher: Minerals, Metals, & Materials Society
ISBN:
Category : Science
Languages : en
Pages : 370
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Book Description
The 37 papers included in this proceedings volume present the state-of-the-art technology of tantalum and tantalum alloys, with an emphasis on the areas of mining, extraction, and refining; fabrication and processing; high strain rate deformation; microstructure, properties, and modeling; applications; and applications and new concepts. It is a valuable reference for scientists and engineers working in this field.
