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A new method is developed for the determination of activation energies for nucleation(E_n) and for growth of nuclei (E_g) during crystallization of amorphous alloys. This methodis based on the crystallization kinetics theory and the experimental results of the variationrelationships of local activation energy E_c(x) and local Avrami exponent n(x) with the crys-tallized volume fraction (x) during crystallization of an amorphous Ni--P alloy. Calculationresults of E_n and E_g in tbe case of crystallization of the amorphous Ni--P alloy by thismethod show that this method is not only simple in the experimental procedures, but alsoaccurate in the quantitative results. 相似文献
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The isothermal crystallization kinetics of amorphous Al-Ni-Zr alloy produced by mechanical alloying was studied by means of differential scanning calorimetry. Accordiag to Arrhenius equation, the apparent activation energy was calculated. The isothermal crystal-lization kinetics follows Johnson-Mehl-Avrami equation with n=2.00 within 0.15相似文献
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By using the new method for determination of activation energies for nucleation andgrowth (E_n & E_g) developed in Part Ⅰ of this work, the E_n and E_g of some pre--annealedamorphous Ni--P alloys, as well as those of the as--quenched Ni--P glass within differenttemperature ranges are measured and studied. The results show that the values of E_n and E_gare closely related to the microstructure of amorphous alloys and the annealing temperature.The higher the ordering in the amorphous alloys, the smaller the values of E_n and E_g; thehigher the annealing temperature, the greater the E_n and E_g values. By means of the newlydeveloped crystallization micromechanism, such an experimental phenomenon which is diffi-cult to understand from the classical crystallization mechanism is reasonably explained. 相似文献
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