非晶Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9合金激光纳米化的超精细结构研究  

Hyperfine stucture during nanocrystallization of amorphous Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9 alloy irradiated by laser

作　　者：陈岁元[1] 刘常升[1] 李慧莉[1] 崔彤[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004

出　　处：《物理学报》2005年第9期4157-4163,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50274028);沈阳市科技计划项目(1032040-1-01)资助的课题.~~

摘　　要：在CO2激光功率为50—300W、扫描速度为20mms、激光散光斑为20mm照射条件下,诱导非晶Fe73.5Cu1Nb3Si13.5B9带中发生结构重组,产生定量纳米αFe(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Fe73.5Cu1Nb3Si13.5B9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Fe73.5Cu1Nb3Si13.5B9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Fe73.5Cu1Nb3Si13.5B9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—25MAm)的αFe(Si)相为DO3结构.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 Fe73.5Cu1Nb3Si13.5B9 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 Moessbauer spectra. Experimental result shows that after the CO2 laser irradiated on the amorphous alloy Fe73.5Cu1Nb3Si13.5B9 , its hyperfine magnetic field distribution 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 Fe73.5Cu1Nb3Si13.5B9 irradiated by a higher laser power produces four hyperfine structures, i.e. two primary crystal phases with relatively small hyperfine magnetic field and two nanocrystalline phases with a relatively large hyperfine magnetic field. The major crystal phase is the α-Fe（Si） phase of DO3 whose hyperfine magnetic field is comparatively larger （17-25MA/m）.

关 键 词：激光 纳米晶α—Fe(Si) 非晶Fe73.5Cu1Nb3Si13.5B9超精细结构 超精细磁场 超精细结构 Fe73.5Cu1Nb3Si13.5B9合金 激光功率 结构研究 纳米化 非晶 晶相形成 

分 类 号：TB383[一般工业技术—材料科学与工程]