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采用机械合金化(MA)法和低温高压快速烧结工艺制备了Fe84Nb4W3B9软磁合金粉末及其块体合金,并研究了粉末的晶粒尺寸、热稳定性和块体合金的相组成,晶粒大小以及相对密度与烧结条件的关系。结果表明:(1)MA60h后,可获得单相α-Fe纳米晶(8.6nm)过饱和固溶体粉末;(2)在MA粉末DSC升温曲线中,分别出现3个强弱不一的放热峰,依次发生了畸变的纳米晶过饱和固溶体的结构弛豫、纳米晶粒长大以及固溶体的相分解过程;(3)在P=5.5GPa,t=3min的烧结条件下,当Pw≥980W后,可获得相对密度98.2%以上、单相α-Fe纳米晶(20.3nm)块体合金,其磁性能为:比饱和磁化强度Ms=154.0emu·g-1,矫顽力Hc=7.474×103A·m-1。
The soft magnetic alloy powder Fe84Nb4W3B9 and its bulk alloy were prepared by mechanical alloying (MA) method and rapid sintering process at low temperature and high pressure. The grain size, thermal stability and phase composition of the bulk alloy, grain size And the relationship between relative density and sintering conditions. The results show that: (1) single phase α-Fe nanocrystal (8.6nm) supersaturated solid solution powder can be obtained after (1) MA 60h; (2) Three peaks of different exothermic peaks (3) Under the sintering condition of P = 5.5GPa, t = 3min, when Pw≥980W, the structure of nanocrystalline supersaturated solid solution, , The relative density of 98.2% can be obtained, single-phase α-Fe nanocrystalline (20.3nm) bulk alloy, the magnetic properties of: specific saturation magnetization Ms = 154.0emu · g-1, coercivity Hc = 7.474 × 103A · M-1.