時効硬化性Cu-3%Ti合金の析出物の結晶構造と析出過程について

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  • On the Crystal Structure of Precipitates and Precipitation Process of Age-Hardenable Cu-3%Ti Alloys. (Metallographic Studies on Age-Hardenable Gu-3%Ti Alloys—(2))
  • ジコウ コウカセイ Cu-3 Ti ゴウキン ノ セキシュツブツ ノ ケッショウ コウゾウ ト セキシュツ カテイ ニ ツイテ
  • On the Crystal Structure of Precipitates and Precipitation Process of Age-Hardenable Cu-3%Ti Alloys. (Metallographic Studies on Age-Hardenable Gu-3%Ti Alloys—(2))

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Precipitates of Cu-3%Ti alloys were extracted with by 50% nitric acid from the specimens aged for 1 hour at 600° and 700°C respectively, and their crystal structure was studied by means of X-ray as well as electron diffraction. It was shown, in both cases, that the precipitates were β′-Cu3Ti with a sightly deformed close-packed hexagonal lattice. The direction of the trace of the precipitates in the pearlitic region which appeared at grain boundaries—discontinuous precipitation—was the same as that of one of the traces of precipitates in the adjacent grain. Therefore, the crystal orientation of the pearlitic region was the same as in the adjacent grain. The plane of the matrix on which the precipitation of Widmanstätten type takes place was determined by three methods, and the results obtained by use of these methods were in good agreement. that is, β′-Cu3Ti precipitates were formed on the (111) planes of the matrix. The following explanation was suggested by the author: The growth of precipitates in the pearlitic regions—discontinous precipitation—may proceed by means of diffusion of the solute atoms along the boundary surface between the pearlitic regionand the bonded supersaturated solution. On the other hand, the growth of the Widmanstätten type precipitates-continuous precipitation—may be controlled by means of bulk diffusion of the solute. As the grain boundary diffusion occurs at relatively lower temperatures than the bulk diffusion, it is reasonable that discontinuous precipitation occurs at relatively lower temperatures, but continuous precipitation occurs at relatively higher temperatures.

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  • 日本金属学会誌

    日本金属学会誌 23 (6), 351-355, 1959

    公益社団法人 日本金属学会

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