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Perkins R a Roger a and Chiang K T and Meier G H Gerald H and Miller R a (1 results)
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Effect of Alloying, Rapid Solidification, and Surface Kinetics on the High temperature Environmental Resistance of Niobium; LMSC-F352227
Published by Lockheed Missiles and Space Company, Inc, Palo Alto, CA, 1989
First Edition
Comb binding. Condition: Fair. 137 pages (per DD Form 1473, Jun 86). Figures, Tables. This may be a copy from a copy. Some writing on the front cover. Authors Perkins and Chiang were with Lockheed. Authors Meier and Miller were with the University of Pittsburgh. This work was prepared for the Air Force Office of Scientific Research. Roger Perkins graduated with his Bachelor's Degree in Metallurgical Engineering from Purdue University, and enjoyed a long career with Lockheed-Martin Aerospace Company after his time with the United States Navy. Gerald Meier served 49 years at Pitt, plus one year as an emeritus professor. He published two successful books, Introduction to the High-Temperature Oxidation of Metals in 2006 and Thermodynamics of Surfaces and Interfaces: Concepts in Inorganic Materials in 2014. From the Abstract: Factors affecting the formation of protective alumina scaled on Nb-base alloys by selective oxidation have been investigated. Alumina cannot be formed in air at latm. on binary Nb-A1 alloys at any NAl. Theoretical knowledge of selective oxidation has been applied to Nb-A1 alloys to alter behavior. The effects of Al-content, temperature, atmosphere, third element additions, and microstructure on the transition from internal to external oxidation of aluminum has been evaluated and conditions under which protective alumina scales can form on Nb-A1 alloys have been defined. Third element additions are required to form protective alumina. The most effective additions are those which can reduce the solubility and diffusivity of oxygen, enhance diffusion of A1, and limit transient oxidation. Additions of Ti, Cr, V and Si were identified as most promising for providing oxidation resistance in Nb-A1 alloys. The feasibility of forming compact, adherent alumina scales on Nb alloys at a minimum NA10.32 in air at 1100-1600 C has been demonstrated. Alumina scale could not be formed below 1100 C. Preoxidation above 1100 C can be used to perform alumina scales that will protect at lower temperatures but is effective only if the alloy is not cooled to room temperature prior to exposure at lower temperatures. Rapid solidification processing does not appear to offer any significant benefit. Presumed First Edition, First printing thus. Xerox style production with degraded photographic images.
