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在差热扫描分析仪上以不同加热速率测试非晶 Fe78Si11B9和纳米晶 Fe73.5Cu1B7Si15.5Nb3合金晶化情况,采用Kissinger方程计算非晶Fe78Si11B9合金的激活能为(370±3) kJ,Fe73.5Cu1B7Si15.5Nb3纳米晶第一晶化相的激活能为(295±5) kJ;提出纳米晶Fe73.5Cu1B7Si15.5Nb3合金初晶相激活能较低与率先析出的Cu簇刺激晶化相析出有关;分析了Cu簇的析出动力学,计算出Fe73.5Cu1B7Si15.5Nb3合金在773 K保温3600 s时Cu簇的生长平均半径为3 nm,在773 K保温2.5 h时,最大析出体积密度为3.7 ×1024/m3;计算结果与K. Hono试验观察结果一致(在 673 K保温 3600 s,平均半径3 nm,析出Cu簇的密度数量级在1024/m3)。
The crystallization kinetics of amorphous Fe78Si11B9 and nanocrystalline Fe73.5Cu1B7Si15.5Nb3 alloys were measured at different heating rates on a differential scanning calorimeter. The Kissinger equation was used to calculate the activation energy of (370 ± 3) kJ, Fe73.5Cu1B7Si15 The activation energy of the first crystallized phase of (.5Nb3) nanocrystals was (295 ± 5) kJ. The lower initial activation energy of the nanocrystalline Fe73.5Cu1B7Si15.5Nb3 alloy was related to the precipitation of the first precipitated Cu clusters. The precipitation kinetics of Cu clusters was calculated. The average growth radius of Cu clusters was 3 nm when Fe73.5Cu1B7Si15.5Nb3 alloy was incubated at 773 K for 3600 s. When the temperature was kept at 773 K for 2.5 h, the maximum precipitated bulk density was 3.7 × 1024 / m3. The calculated results are consistent with the results of the K. Hono test (3600 s at 673 K with an average radius of 3 nm and a Cu cluster density of 1024 / m3).