青銅樹状晶の内部組織に就て

概要

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The internal structures of dendrites of bronze were studied by means of X-ray "Ruckaufnahme" and obtained following results. When the alloys were solidified very slowly the stems of dendrites have nearly uniform compositions which do not much differ from those of annealed one. The distributions of compositions in the dendrites of alloys cast in the chill mould are nearly the same, but the crystal arrangements much differ. When the rate of solidifieation is not so rapid nor slow, as in the sand mould, X-ray photographs consist of Debye-Scherrer rings corresponding to the stems of dendrites and broad bands corresponding to the fillings of dendrites. The compositions of these stems of dendrites calculated from the lattice constant suggest the degrees of super-cooling and the edges of the bands correspond to the limit of solubility of Sn in α-solid solution. When annealed 1hr. at 800℃, these non-uniformness of the compositions almost disappear. The fracture surfaces of these cast alloys consist of Sn-rich side of the fillings of the dendrites.
社団法人日本鉄鋼協会の論文
1936-09-25