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Ternary alloying effects in polycrystalline {beta}-NiAl

Description: Purpose of this paper is to summarize alloying research to date in polycrystalline NiAl and its impact on microstructure and ambient temperature properties. It is divided into the following sections: phase equilibria, solid solution effects and precipitation effects. Alloys that contain a high volume fraction of second phase (e.g. pseudobinary eutectic compositions) are not considered. Rather, the effects of dilute to moderate ternary alloying additions on the structure and properties of {beta}-NiAl are reviewed. It is already well established that stoichiometry is paramount in controlling mechanical properties of the binary compound. Since the addition of a third element is equally important, ternary phase equilibria are reviewed first. Solid solution strengthening is probably the least well understood particularly with respect to the nature of point defects and their contribution to strength. Characterization of these defects and their role in mechanical properties may well hold the key to future development of NiAl-based materials. With regard to second phases, there is limited evidence that the classical precipitation hardening mechanisms for metals are also applicable to NiAl.
Date: May 1, 1993
Creator: Cotton, J. D.; Noebe, R. D. & Kaufman, M. J.
Partner: UNT Libraries Government Documents Department

Titanium-tantalum alloy development

Description: Research has been underway at Los Alamos National Laboratory for several years to develop an alloy capable of containing toxic materials in the event of a fire involving a nuclear weapon. Due to their high melting point, good oxidation resistance, and low solubility in molten plutonium, alloys based on the Ti-Ta binary system have been developed for this purpose. The course of the alloy development to-date, along with processing and property data, are presented in this overview.
Date: April 1, 1996
Creator: Cotton, J.D.; Bingert, J.F.; Dunn, P.S.; Butt, D.P. & Margevicius, R.W.
Partner: UNT Libraries Government Documents Department

Oxidation behavior and microstructural decomposition of Ti-6Al-4V and Ti-6Al-4V-1B sheet

Description: This article conducts a direct comparison between the oxidation behavior of Ti-6Al-4V and Ti-6Al-4V + 1B to elucidate whether the addition of boron to Ti-^Al-4V impacts the oxidation behavior.
Date: August 1, 2016
Creator: Brice, David. A.; Samimi, P.; Ghamarian, I.; Liu, Yue; Brice, R. M.; Reidy, Richard F. et al.
Partner: UNT College of Engineering

Attempts to model the generation of new grain boundaries during the deformation of polycrystals

Description: We explore ways by which new orientations (``nuclei``) can arise during essentially homogeneous deformation in polycrystals. All of these can be categorized as generating new large-angle boundaries: one is due to excessive storage of dislocations of one sign parallel to existing grain boundaries; another is due to reactions of cell walls with grain edges; and in the last, new boundaries are created surrounding a domain of different slip system distribution.
Date: December 31, 1993
Creator: Kocks, U. F.; Cotton, J. D.; Chen, S. R.; Wright, S. I.; Rollett, A. D.; Embury, J. D. et al.
Partner: UNT Libraries Government Documents Department