Cu-10 mass%Ni-8 mass%Sn合金の粒界反応型析出

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タイトル別名
  • Grain Boundary Reaction in a Cu-10 mass%Ni-8 mass%Sn Alloy
  • Cu 10 massパーセント Ni 8 massパーセント Sn ゴウキン

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The characteristics of the grain boundary reaction in a Cu-10 mass%Ni-8 mass%Sn alloy aged isothermally at 623 to 773 K after water quenching from 1123 K were investigated by optical and electron microscopic observations, hardness measurements and the X-ray diffraction methed. Results obtained are as follows:<BR>(1) The incubation periods were observed in the nodule growth curves, namely the nodule began to grow after the hardness of the matrix nearly reached a maximum value, and then engulfed the matrix entirely.<BR>(2) The pearlitic structure which consisted of the equilibrium α phase and the equilibrium γ phase [(Cu·Ni)3Sn] was observed in the nodule from the period of nodule formation, and the shape of the γ phase scarecely changed with progress of aging. The lattice parameter of the γ phase of an ordered fcc structure was 0.5940 nm.<BR>(3) The secondary pearlitic nodule containing γ precipitates larger than those in the primary nodule was observed on the prolonged aging after the completion of the primary grain boundary reaction.<BR>(4) The area fraction of the nodule, X, can be represented by Johnson-Mehl’s equation: X=1−exp(−btn), where t is the aging time and b and n are constants, and values 2.2∼2.6 were obtained as n.<BR>(5) The value of apparent activation energy for nodule growth was about 120 kJ/mol.

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  • 日本金属学会誌

    日本金属学会誌 46 (3), 307-312, 1982

    公益社団法人 日本金属学会

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