Cu和Nb元素对Fe-Cu-Nb-Si-B纳米晶合金晶化动力学的影响研究(英文)  

Effect of Copper and Niobium Addition on Crystallization Kinetics in Fe-Cu-Nb-Si-B Alloys

作　　者：李广敏[1] 李德仁[1] 倪晓俊[1] 李准[1] 卢志超[1] 

机构地区：[1]中国钢研科技集团安泰科技股份有限公司,北京100081

出　　处：《稀有金属材料与工程》2013年第7期1352-1355,共4页Rare Metal Materials and Engineering

基　　金：National High Technology Research and Development Program of China "863 Program"(2009AA03Z214)

摘　　要：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 activation energies of amorphous Fe78Si11B9 and nanocrystalline Fe73.5Cu1B7Si15.5Nb3 alloys were tested by a high-sensitivity differential scanning calorimeter with different heating rates. Kissinger equation was adopted to calculate the activation energies of the primary phase of Fe73.5Cu1B7Si15.5Nb3 alloy （295±5） kJ and the crystal phase of Fe78Si11B9 alloy （370±3） kJ. The low activation energy of the primary phase for Fe73.5Cu1B7Si15.5Nb3 alloy is related to the precipitation of Cu clusters. The precipitation kinetics of Cu clusters was analyzed. The calculated result of the mean radius Rm of Cu cluster is 3 nm after aging for 3600 s at 773 K in Fe73.5Cu1B7Sil5.5Nb3 glass alloy and the maximum value of number density is 3.7 ×10^（24）/m^3 after aging for 2.5 h at 773 K, which accords with K. Hono＇s observation （approximately 3 nm after annealing at 673 K or 3600 s）. The density of Cu is in the order of 1024 m3）.

关 键 词：纳米晶合金 Fe—Cu—Nb—Si—B合金 晶化动力学 Cu簇 

分 类 号：TB383.1[一般工业技术—材料科学与工程]