《Table 1 Electrical conductivity (γ) and transformation ratio of precipitates (φ) corresponding to a

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《Cu-Be-Co-Zr合金时效析出动力学（英文）》

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The initial electrical conductivity（?0）is 24.6%IACS（Fig.1）.After aging for 480 and 600 min，the electrical conductivity has a peak value of 43.8%IACS（?min）.It can be assumed that the equilibrium state of precipitation has achieved at this moment（φ=1）.So the coefficient A=?max–?0 and the value is19.2%IACS.According to the experimental data of electrical conductivity（?），the transformation ratio（φ）of precipitates corresponding to aging time are calculated，as shown in Table 1.In addition，the relationship between transformation ratio（φ）of precipitates and aging time follows the Avrami empirical formula[8-10]: