Accession Number:

AD0850230

Title:

A Study of the Balanced States in the NiCrTiAlW System,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1968-07-23

Pagination or Media Count:

27.0

Abstract:

The work deals with the NiCrTiAlW system, with the tungsten content varying from 0 to 15 at. and with a different TiAl ratio, studied at a temperature of 850 C. A phase analysis of 101 alloys, annealed at 850 C to the state of equilibrium, was made by optical and electron microscopy and by the X-ray method. The results show that in addition to the permanent eta and gamma phases present in the solid solution of nickel, there exists the phase alpha which, according to the X-ray phase analysis and the X-ray probe spectral microanalysis, represents the W-base solid solution. In the above system, the phase is stable even at 850 C, whereas the Ni4W phase has not been observed at this temperature. It is concluded that the range of the alpha-phase, in the quinternary system, increases toward the lower temperatures. Applying the X-ray probe spectral microanalysis indicated that the solubility of Ni in the alpha-phase of the studied system is 2. Similarly, the eta phase was able to dissolve further elements, mainly Cr and W, and solubility of these elements in the eta-phase was greater than zero. The solubility of W in the basic solid solution gamma at various TiAl ratios, was 8 at. . Author

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE