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研究了MA法和热压烧结工艺制备的Fe84Nb7B9和Fe80 Ti8B12 合金粉末的产物及其块体合金的微观组织结构和磁性能。结果表明 :(1) 2 0hMA后 ,Fe84Nb7B9和Fe80 Ti8B12 均形成了单相bcc纳米晶过饱和固溶体 ,相对前者 ,后者纳米晶组织热稳定性明显提高 ,过饱和固溶体相分解温度略有降低 ;(2 )在 30MPa/ 90 0℃ / 0 5h热压条件下 ,Fe84Nb7B9和Fe80 Ti8B12 块体合金相对密度分别为 96 7%和 95 5 % ,相对前者 (多相组织 ) ,后者由超细晶 (5 0～2 0 0nm)单相α Fe组成 ;(3)Fe80 Ti8B12 块体合金软磁性能 (σs=198 6emu/ g ,Hc =5 4 6Oe)明显高于Fe84Nb7B9块体合金 (σs=16 2 9emu/g ,Hc =10 5 1Oe) ,此与纳米晶粉末在热压烧结过程中所形成相的种类和晶粒尺寸大小有关
The microstructure and magnetic properties of the products of Fe84Nb7B9 and Fe80Ti8B12 alloy powders prepared by MA method and hot-pressing sintering process and their bulk alloys were studied. The results show that: (1) After 20hMA, single phase bcc nanocrystalline supersaturated solid solution is formed on both Fe84Nb7B9 and Fe80Ti8B12. Compared with the former, the thermal stability of the latter nanocrystalline structure increases obviously and the phase decomposition temperature of supersaturated solid solution decreases slightly. (2) The relative densities of Fe84Nb7B9 and Fe80Ti8B12 bulk alloys were 96 7% and 95 5% at 30MPa / 90 0 ℃ / 0 5h hot pressing, respectively, compared with the former (multi-phase structure) (5 0 ~ 200 nm) single phase α Fe. (3) The soft magnetic properties of the Fe80 Ti8B12 bulk alloy (σs = 198 6emu / g, Hc = 546Oe) were significantly higher than those of the Fe84Nb7B9 bulk alloy 2 9emu / g, Hc = 10 5 1Oe), which is related to the type of nanocrystalline powder formed during hot-pressing and the size of the grain size