Letter | Published:

Investigation of Equilibrium Diagrams of Ternary Alloys by X-Rays

Nature volume 140, pages 543544 (25 September 1937) | Download Citation



IT is the purpose of this note to point out how rapidly and efficiently ternary equilibrium diagrams may be elucidated by means of X-ray analysis. In a recent paper, Jette1 described a partial analysis of the chromium-iron-silicon system by X-rays. We have carried out the analysis of several ternary diagrams which will be published shortly. As an example, we give the diagram for the copper-nickel-aluminium system, the compositions being represented in the usual way by points within an equilateral triangle. Any one such diagram shows the phases at a given temperature, and a series of such diagrams is required to represent the state of affairs at different temperatures. The present diagram actually shows the phases present after a uniform heat treatment of slow cooling at 10° C. per hour. No claim is made that equilibrium has been established, our main object being to show the exploratory power of X-ray analysis. It will be supposed that the binary equilibrium diagrams, represented by the three sides of the triangle, have previously been established by metallurgical or X-ray methods. It is our experience that the investigation of the whole interior of the ternary diagram is, in general, easier than that of a single complicated binary system, since for the most part the phases are the same as those of the binaries. In other words, the appearance of quite a new phase is comparatively rare ; we merely have to determine how far the two-component phases extend into areas of the ternary diagram.

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    , and , Trans. Amer. Soc. Metals, 24 (2), 375–419 (1936).

  2. 2.

    , Inst. Met., 4, part 4, 222 (April, 1937); , J. Inst. Met., 4, part 2, 79 (Feb., 1937).

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    , and , J. Inst. Met., 29, 71 (1923).

  4. 4.

    , , und , Metallwirtschaft, 14, Heft 40, 793–794 (Oct., 1935); , und , Metallwirtschaft, 15, Heft 36, 840–842 (Sept., 1936).

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  1. Physical Laboratories, University, Manchester. July 31.

    • A. J. BRADLEY
    • , H. LIPSON
    •  & A. TAYLOR


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