Principles of Metallography

Principles of Metallography

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 edition. Excerpt: ...3 and the system becomes non-variant. Neither the temperature of the mixture nor the composition of the three phases can change until one of the three phases has disappeared. The temperature cannot fall until all the liquid phase, E has solidified nor can it rise without the disappearance of either A or B. It must not be understood that the mixture can have only the composition represented by the point E. It may have any composition along the line CD but, in this case, the composition of each phase remains the same, the difference in original composition producing changes in the relative amounts of the three. The line CD, therefore, is a line of non-variant equilibrium. One of the principle uses of the Phase Rule is to determine whether or not true equilibrium has been reached. It is evident that, since an alloy with less than zero degrees of freedom is an impossibility, there can never be more than two crystal phases in contact with, or separating from, a two component liquid metal. Therefore, in a case like that indicated in Fig. 26, p. 53, and illustrated in Fig. 28, p. 55, the presence of three phases, in the microscopic section of the solid alloy, is a positive indication of incomplete equilibrium. CHAPTER IV THE NON-FERROUS ALLOYS OF TECHNICAL IMPORTANCE No attempt will be made to describe or even to name the large and constantly increasing number of nonferrous alloys used in practice. Certain of them are of such great technical interest and importance, however, that their properties must be considered. Many have been referred to in connection with the equilibrium diagrams and others are of such special character that their consideration is out of place here. The majority of the important non-ferrous alloys not yet discussed fall into one...
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Product details

  • Paperback | 34 pages
  • 189 x 246 x 2mm | 82g
  • Miami Fl, United States
  • English
  • Illustrations, black and white
  • 1236642899
  • 9781236642899