Journal of the Association of Engineering Societies . shortness to the metal. In the case of such alloys it canbe predicted that, for any given change in the percentage ofimpurity present, a radical change in the properties of the alloyover that in the pure metal will take place. For instance, the electrical conductivity of copper being repre-sented by ioo, the addition of per cent, of arsenic reducesthis to , or the addition of per cent, reduces the conduc-tivity to , the arsenic forming, with copper, an alloy similar tothe bismuth copper alloy shown. There is still anothe
Journal of the Association of Engineering Societies . shortness to the metal. In the case of such alloys it canbe predicted that, for any given change in the percentage ofimpurity present, a radical change in the properties of the alloyover that in the pure metal will take place. For instance, the electrical conductivity of copper being repre-sented by ioo, the addition of per cent, of arsenic reducesthis to , or the addition of per cent, reduces the conduc-tivity to , the arsenic forming, with copper, an alloy similar tothe bismuth copper alloy shown. There is still another structural component of alloys, seldom found as constituting the entire structure of anyalloy, it forms a very important structural constituent of mostalloys. This is called the eutectic alloy. When a molten homogeneous solution of metals is allowed tocool, as has been stated, different constituents become insoluble ascertain temperatures are reached. These separate out and becomestructural components of the finally solidified Lead silver. Iron ; phosphide of iron. Iron; carbide ot iron. Note.—The large white area in the right-hand photograph represents free segregatedcarbide of iron. Fig. 6. Characteristic Structures of Eutectic such action has or has not taken place, however, therecomes a point where the remaining solution freezes as a whole. Ifthe metals can form a solid solution, as is the case with the firstclass of alloys, this will be done. If the constituents are not mutu-ally soluble to one another, a separation will take place at theinstant o<f solidification, and the resulting alloy will be found toconsist of alternate layers of the different separated strong magnification is required to resolve this kind of alloy is always characterized by the fact of its having thelowest melting point of any of the whole series between two is, in fact, always a solidified mother liquor. The compositi
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectenginee, bookyear1881
