各種温度で時効せる10%Sn-Pb合金の比熱測定

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  • Specific Heat Measurements on 10%Sn-Pb Alloy Aged at Various Temperatures. (On Precipitation of Tin from Lead-Tin Solid Solutions (4th Report))
  • カクシュ オンド デ ジコウセル 10 Sn-Pb ゴウキン ノ ヒネツ ソクテイ

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The aging process of 10%Sn-Pb alloy at 50°, 75°, 100° and 110° was studied by tracing the specific heat- versus-temperature curves. (1) At a temperature lower than about 112°, the precipitation of tin from lead takes place in two stages. At a higher temperature than about 112°, the precipitation of tin seems to be completed in one stage. (2) The kinetic law for the 2nd stage of the precipitation seems to be represented as follows; p=Ktn+C, where n is a constant independent of temperature and has the value of about 0.5. The activation energy for the 2nd stage was obtained from the relation between the rate constant K and the aging temperature T. The activation energy for the 2nd stage obtained in this investigation is ca. 18 kcal/mol and is in fair agreement with the earlier estimation of the activation energy for the 2nd stage obtained from the micro-hardness measurements, ca. 22 kcal/mol. These values of the activation energy for the 2nd stage are appreciably different from the activation energy for the 1st stage, ca. 9 kcal/mol.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 23 (3), 173-177, 1959

    公益社団法人 日本金属学会

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