X-ray Study of the Sigma Phase in Various Alloy Systems

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Abstract
This paper presents a critical review of the X-ray diffraction data of the sigma phase in the binary alloys of iron, cobalt, nickel, chromium, and vanadium. Although the crystal structure of the sigma phase is still unknown, a tentative tetragonal unit cell is suggested to describe the structure, at least as a first approximation. On the basis of this cell the lattice parameters of the various binary sigma phases are computed. The case of a ternary sigma solid solution in the iron-chromium-molybdenum system is also discussed and the influence of molybdenum on the lattice parameter of sigma is described. A short discussion is given on the occurrence of the sigma phase in binary alloys and its relation to atomic diameter and crystal structure of the two component metals.

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