低频脉冲磁场处理非晶合金Fe78Si9B13低温纳米晶化的穆斯堡尔谱研究

Studies on M?ssbauer Spectroscopy of Nanocrystallization of Amorphous Fe78Si9B13 Alloy at Low Temperature by Low Frequency Pulse Magnetic Field

摘要:

用低频脉冲磁场处理非晶Fe78Si9B13合金，处理过程中的温升用LRSC型红外非接触测温仪测量，处理前后的试样用M?ssbauer谱结合透射电镜进行了微结构分析。结果表明，在低频脉冲磁场处理下，非晶Fe78Si9B13合金在低温下即发生了纳米晶化，试样温升小于7 ℃时，晶化析出相为体心立方α-Fe(Si)，析出量介于2.18%~9.43%之间，晶粒尺寸约10 nm，且所形成的非晶/纳米晶双相纳米合金的平均超精细磁场较原始非晶合金的均有所增强

Abstract:

Amorphous Fe78Si9B13 alloys were treated by low frequency pulse magnetic field. The temperature rise in the course of the treatment of pulsed magnetic field was measured by a non-contact infrared thermometer. The microstructure changes of amorphous specimens after treatment were observed by M?ssbauer spectroscopy and TEM. The results show that the nanocrystallization of amorphous specimens can occur at low temperature. When the temperature rise is under 7 ℃, the precipitation content and the grain size of the nanocrystalline phase α-Fe(Si) with bcc crystal structure are about 2.18%~9.43% and 10 nm, Respectively. Compared with the original amorphous alloy, the double- phase (amorphous nanocrystaline) nanocrystalline alloy has obvious high mean hyperfine magnetic field