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采用机械合金化(MA)以及低温高压烧结工艺制备了Fe84Nb7B9软磁合金粉末及其块体合金,并利用XRD、DSC、SEM对MA合金粉末和块体合金的相结构、晶粒大小以及组织的热稳定性进行了研究。结果表明:经过15hMA后,可获得单相bcc结构的粒径小于10nm的纳米晶过饱和固溶体粉末;在常压状态下,单相纳米晶过饱和固溶体合金在温度小于550℃时具有良好的组织热稳定性,温度小于770℃时具有良好的相热稳定性;在p=5.5GPa,t=3min条件下,当Pw≥820W时,可获得相对密度大于98.4%、单相bcc结构的纳米晶(粒径小于10nm)块体合金。
The soft magnetic alloy powder Fe84Nb7B9 and its bulk alloy were prepared by mechanical alloying (MA) and low temperature high pressure sintering process. The phase structure, grain size and microstructure of MA alloy powder and bulk alloy were characterized by XRD, DSC and SEM Thermal stability has been studied. The results show that after 15hMA, single-phase nanocrystalline supersaturated solid solution powders of bcc structure with particle size less than 10nm can be obtained. Under normal pressure, single-phase nanocrystalline supersaturated solid solution alloy has good microstructure at temperature less than 550 ℃ Thermal stability, good phase and thermal stability at temperatures below 770 ° C; nanocomposites with a relative density greater than 98.4% at a P = 8 GPa, t = 3 min, and a single-phase bcc structure (Particle size less than 10nm) bulk alloy.