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Author : United States Air Force Materials Laboratory. Metals and Ceramics Division
Publisher :
Page : 689 pages
File Size : 20,39 MB
Release :
Category : Alloys
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Author : E. Rudy
Publisher :
Page : 732 pages
File Size : 40,65 MB
Release : 1969
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This report contains a summary of phase diagram work conducted over the time period from 1 January 1964 through April 1969. Systems studied include binary transition metal systems, binary and ternary systems of refractory transition metals with carbon, boron, silicon, and nitrogen, and selected concentration-temperature sections of higher order systems involving the same elements.
Author : E. Rudy
Publisher :
Page : 68 pages
File Size : 22,81 MB
Release : 1967
Category : Phase diagrams
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Author : E. Rudy
Publisher :
Page : 90 pages
File Size : 28,5 MB
Release : 1965
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The alloy system tantalum-carbon was investigated by means of X-ray, DTA, and melting point techniques on heat-treated and chemically analyzed alloys; a complete phase diagram was established. Analogously to the findings in the Ta-C systems, a previously unknown phase reaction of the Nb2C phase was found to occur at high temperatures. The melting temperatures of the monocarbide phase and the NbC-C eutectic reaction isotherm were redetermined. The alpha- beta-Me2C-phase reaction could not be found in the vanadium-carbon system.
Author : Y. A. Chang
Publisher :
Page : 51 pages
File Size : 44,61 MB
Release : 1966
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A complete phase diagram for the ternary alloy system titanium-hafnium-boron from 1000 C through the melting ranges of the diborides was established on the basis of X-ray, melting point and metallographic studies. The outstanding features of the system are that both the metal diborides and monoborides form continuous solid solutions with respect to metal exchange. From the distribution of the tie-lines in the metal monoboride two-phase field, the Gibbs free energy difference between the titanium monoboride and hafnium monoboride was derived. (Author).
Author : Y. A. Chang
Publisher :
Page : 65 pages
File Size : 43,14 MB
Release : 1967
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Phase equilibria in the ternary system vanadium-niobium-carbon from 800C through the melting ranges of the cubic monocarbide solid solutions were established on the basis of X-ray, melting point and metallographic studies. The phase equilibria above 1400C are presented in a three-dimensional temperature-composition constitutional diagram, since the phase equilibria below 1400C were not thoroughly investigated due to kinetic problems. Vanadium monocarbide and niobium monocarbide form a continuous series of solid solutions as do the low-temperature modification of the ordered hexagonal vanadium subcarbide to niobium subcarbide. However, the addition of vanadium subcarbide to niobium subcarbide stabilizes the high-temperature modification of the disordered hexagonal niobium subcarbide to about 1780C in the ternary field. (Author).
Author : Erwin Rudy
Publisher :
Page : 72 pages
File Size : 36,53 MB
Release : 1965
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On the basis of X-ray, melting point, metallographic, and differential thermoanalytical studies on molybdenum-boron and tungsten-boron alloys, constitution diagrams for both binary systems are presented. In the high temperature regions, the newly established phase diagrams differ significantly from previously reported systems. The results are discussed and compared with available literature data. (Author).
Author : E. Rudy
Publisher :
Page : 108 pages
File Size : 10,46 MB
Release : 1966
Category : Phase diagrams
ISBN :
Author : Erwin Rudy
Publisher :
Page : 63 pages
File Size : 21,38 MB
Release : 1965
Category :
ISBN :
The alloy system hafnium-carbon was investigated by means of X-ray, DTA, and melting point techniques on chemically analyzed alloys, and a complete phase diagram was established. The results are discussed and compared with previously reported data.
Author : E. Rudy
Publisher :
Page : 74 pages
File Size : 16,22 MB
Release : 1969
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ISBN :
The ternary alloy system niobium-tungsten-carbon was investigated by means of X-ray, melting point, DTA, and metallographic techniques on chemically and thermally defined specimens. A phase diagram from 1500C through the melting range was established. The solid state equilibria in the system are characterized by limited metal exchanges in the subcarbides and the occurrence of a two-phase equilibrium between the monocarbide and the metal phase. Above 2530C, niobium monocarbide and the cubic high temperature phase in the W-C system form an uninterrupted series of solid solutions; below this temperature, the tungsten exchange in NbC is temperature-dependent and decreases to approximately 25 At% W at 1500C. The tungsten exchange in Nb2C is less than 5 At% at all temperatures, whereas the solubility in W2C increases from 24 mole% Nb2C at 1500C, to a maximum of approximately 37 mole% Nb2C at 2600C. The order-disorder reaction, as well as the change-of-order transition, temperature in W2C and Nb2C are lowered by niobium additions, but the details of the transition reactions in the ternary could not be delineated. Five isothermal reactions, all of which involve a liquid phase, occur in the system. Two correspond to limiting tie lines and the remaining three are class II (two-over-two) ternary reactions. The results of this phase diagram investigation are discussed and the phase equilibria thermodynamically analyzed and interpreted. (Author).