摘要
研究了微波场对晶化的影响.结果表明,将非晶合金Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9在微波场作用下在480℃短时间(5 min)晶化处理,形成体积分数为80%、尺寸约15nm的α-Fe(Si)相;适当延长晶化时间(30 min)使非晶合金完全晶化,α-Fe(Si)相的晶粒不再长大,原子层之间的距离降低至0.2461 nm,磁体具有最大M_s为1.79 T.与激光、激波、脉冲电场和脉冲磁场晶化处理相比,微波场晶化处理可同时获得单一的、更小晶粒尺寸和更高体积分数的α-Fe(Si)晶化相,使合金具有高的饱和磁化强度和优良的软磁性能.微波场有利于非晶合金中的硼原子向空位跃迁,使基体金属相α-Fe(Si)相的形核率增大,促进非晶合金的纳米晶化.
Amorphous Fe73.5Cu1Nb3Si13.5B9 alloys have been nanocrystallized by microwave field annealing and the effect of microwave field on the nanocrystallization has been investigated. It is shown that by microwave field annealing at 480℃ for 5 min, 80% fine nanocrystalline α-Fe（Si） grains about 15 nm formed in the amorphous matrix. With increasing annealing time to appropriate value （30 min）, the nanocrystallization completed and the grain size of the α-Fe（Si） phase stays nearly the same, but the lattice parameter decreases to 0.2461 nm, and the alloy has a very high Ms of 1.79 T. Comparing to annealing by laser, shock wave, current and magnetic field, after the alloy was annealed by microwave field single α-Fe（Si） phase, smaller grain size and higher crystal phase volume can simulantly obtained. It is also revealed that microwave field benefits the transition of atom B toward vacancy, which increases the nucleation rate of α-Fe（Si） phase and promotes the nanocrystallization of the alloy.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2007年第6期632-636,共5页
Chinese Journal of Materials Research
基金
湖南省自然科学基金04JJ6029资助项目~~
