Metallurgy : a textbook for manufacturers, foremen and workers in the metal industries, with a special consideration of detnal metallurgy.

  • Fenchel, A.
Date:
1911
Catalogue details

Licence: In copyright

Credit: Metallurgy : a textbook for manufacturers, foremen and workers in the metal industries, with a special consideration of detnal metallurgy. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    (III) On the line Ex C there appears a primary crystal- lization of the chemical compound C, so that phase III consists of crystals C + liquid eutectic Er Below the line U W all is crystallized. (IV) The remaining liquid eutectic separates out in all cases on the line U W = 500 C. Phase IV, fig. 12, consists of crystallized + A or C eutectic or pure eutectic. (V) On the line C E2 there appears a primary separation of the compound C. Phase V contains crystals of the compound C + liquid eutectic E2. At all points on the line H E2 (5300 C.) the remainder of the eutectic, which was fluid, now crystallizes out, so we see that the eutectic between C -f- B always crystal- lizes completely at E2 (5300 C). Below H E2 in this region crystallized C + E2 is demonstrated. All the points of line E2 B indicate a primary crystal- lization of pure B, consequently in phase VI the B crystals are mixed up with liquid eutectic, which crystal- lizes secondarily at the eutectic temperature (5300 C.) indicated by the line E2 Z. In phase VII the compound is crystallized again throughout (C + E2, or B + E2). By observing these points of crystallization or retarda- tions on cooling we can make the following deductions (fig. 12). (1) At F G there is no eutectic and the metal A is 100 per cent, or pure. (2) At M N the eutectic Ex amounts to 100 per cent, and consists of 85 per cent. A + 15 per cent. B. (3) At H J there is no eutectic, but 100 per cent, of a chemical compound Am Bn (= 65 per cent. A + 35 per cent. B).