A note on transition metal alloys

Abstract

Abstract The composition limits of the different crystal structures found in the alloys of Transition Elements of Groups VA to VIIIC are discussed. The alloys of these elements give rise to phases with crystal structures of the [sgrave], c.p. hexagonal, αMn, and βW types. The composition limits of these are often related to the Group Numbers of the constituent elements. If the equilibrium diagrams are drawn with the element of lower Group Number on the left, passage across the diagram from left to right results in the occurrence of different phases in the following order: b.c. cube→βW→[sgrave]→αMn →c.p.hex. →f.c. cube. In all systems one or more of the above phases is absent, but the characteristic order is retained. In the alloys of elements of Group VIIIC with the elements in the middle of the transition series, there is a general tendency for the primary solid solution in the element of Group VIIIC to be greater than that in the element of the earlier Group, and an explanstion of this is advanced.