熔体快淬非晶Fe-Si-B-Cu合金的晶化行为  

Crystallization behavior of melt-spun amorphous alloy Fe-Si-B-Cu

作　　者：赵仲恺[1] 周海涛[1] 周啸[2] 严彪[3] 钟建伟[1] 李庆波[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]江西理工大学材料与化学工程学院,赣州341000 [3]同济大学上海市金属功能材料重点实验室,上海200092

出　　处：《中国有色金属学报》2008年第10期1872-1878,共7页The Chinese Journal of Nonferrous Metals

摘　　要：采用差热扫描量热分析（DSC）、X射线衍射分析（XRD）以及透射电镜技术（TEM）对熔体快淬非晶薄带Fe75.5Si13.5B9Cu2的晶化行为进行研究。结果表明：在不同升温速率下的DSC曲线中出现两个放热峰,晶化表观激活能分别为369.177和430.162kJ/mol;经500～680℃、1h等温退火后,发现晶化时发生α-Fe（Si）相的形核长大以及Fe3B和Fe2B相的析出;在500℃退火后获得的α-Fe（Si）平均晶粒尺寸最小;α-Fe（Si）的晶格常数起初增大,在560℃达到最大值后缓慢降低;在500℃等温退火,随着时间的延长,α-Fe（Si）的晶粒尺寸及晶格常数逐渐增大,在等温退火1h时,晶粒尺寸约为20nm。The crystallization process of the amorphous soft magnetic alloy Fe75.sSi13.sB9Cu2 was investigated by DSC, XRD and TEM. The DSC curves show two exothermal peaks, of which the crystallization activation energy Ea are 369.177 kJ/mol and 430.162 kJ/mol in average for the first peak and second one, respectively. This can be explained by the crystallization mechanism, that is, grain nucleation and growth process of a-Fe（Si） and the precipitation of Fe3B and Fe2B phases. Annealing at 500 to 680 ℃ for 1 h, the nano-grain size of α-Fe（Si） is minimate at 500 ℃, and the lattice parameter of α-Fe（Si） solid solution increases with rising temperature at the beginning, reaches the maximum value at 560 ℃ and goes down slightly. Moreover, both of the grain size and the lattice parameter increase with the annealing process continuing at 500 ℃ and the average grain size is about 20 nm for 1h.

关 键 词：非晶合金 纳米晶 相变 晶粒尺寸 晶格常数 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TM273[金属学及工艺—合金]