非晶Fe73.5Cu1Nb3Si13.5B9合金激光纳米化的超精细结构研究

在CO₂激光功率为50—300W、扫描速度为20mm/s、激光散光斑为20mm照射条件下 ，诱导非 晶Fe_735Cu₁Nb₃Si_135B9带中发生结构重组，产生定量纳米α-F e(Si)晶相形成双相组织结构材料. 利用穆斯堡尔谱研究了非晶Fe_735C u₁Nb₃Si_135B₉合金激光纳米化的 超精细结构. 实验结果表明，激光诱导非晶 Fe_735Cu₁Nb₃Si_135B ₉纳米化后，其超精细磁场的分布随 着激光功率变 化由单峰向双峰变化，在高功率辐照时， 出现了双峰分布，并且峰位向高场移动. 高激光 功率辐照非晶Fe_735Cu₁Nb₃Si_{135B9合金纳米晶化相有四种超精细结 构，即2个超精细磁场较小的初晶相和2个超精细磁场较大的纳米晶化相. 其中超精细磁场较 大(17—25MA/m)的α-Fe(Si)相为DO3结构. 关键词： 激光 纳米晶α-Fe（Si) 735}Cu₁Nb< sub>3Si_135B₉')" href="#">非晶Fe_735Cu₁Nb< sub>3Si_135B₉ 超精细结构 超精细磁场

Hyperfine stucture during nanocrystallization of amorphous Fe73.5Cu1Nb3Si13.5B9 alloy irradiated by laser

The material composed of a definite amount of nanocrystalline phase α-Fe(Si) with a double-phase structure was produced by laser irradiation on the amorphous Fe_735Cu₁Nb₃Si_135B_{9< /sub> alloy with a laser power ranging from 50 to 300W, scanning speed 20mm/s, laser beam spot 20mm. Hyperfine structures of the nanocrystallized samples were analyzed by Mssbauer spectra. Experimental result shows that after the CO2 laser irradiated on the amorphous allo y Fe735Cu1Nb3Si135B 9, its hyperfine magnetic field dist ribution transformed from a single peak to double peaks with the change of laser power. When irradiated at a high laser power, it formed a double-peak structure and the peaks moved to a high field position. Nanocrystallization of amorphous Fe7 35Cu1Nb3Si135B9 ir radiated by a higher laser power produces fou r hyperfine structures, i.e. two primary crystal phases with relatively small hy perfine magnetic field and two nanocrystalline phases with a relatively large hy perfine magnetic field. The major crystal phase is the α-Fe(Si) phase of DO3 whose hyperfine magnetic field is comparatively larger (17—25MA/m).}