Standard test specimens of zinc bronze (Cu88, Sn10, Zn2)--Parts I and II . t is to be expected that, ordinarily,a very slow cooling will result in large crystals and a coarse-mesheddendritic structure. Mechanical disturbances, however, mayinterfere so that crystallization begins at a great many centersand smaller crystals with a fairly coarse interior structure mayresult with approximately the same rate of cooling. (CompareFig. 15, a and c.) Another important result of the influence of rate of cooling uponthe structure is the amount of eutectoid which is dissolved by thea constituent. Theoreti
Standard test specimens of zinc bronze (Cu88, Sn10, Zn2)--Parts I and II . t is to be expected that, ordinarily,a very slow cooling will result in large crystals and a coarse-mesheddendritic structure. Mechanical disturbances, however, mayinterfere so that crystallization begins at a great many centersand smaller crystals with a fairly coarse interior structure mayresult with approximately the same rate of cooling. (CompareFig. 15, a and c.) Another important result of the influence of rate of cooling uponthe structure is the amount of eutectoid which is dissolved by thea constituent. Theoretically it should be possible with alloysof the percentage of tin here considered to have, at the most,only traces of the eutectoid showing. Practically this neverresults in the cast alloy. By the use of chill molds, the soHdifica-tion and the subsequent cooling of the alloy may be so rapid thatthe eutectoid inversion may be partially obliterated, so that thejS constituent is retained, at least in the outer crust thus imparting Bureau of Standards Technologic Paper No. 59.
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