【摘要】 在相同激光扫描速度(20mm/s)和不同激光功率(150W,200W,250W,300W)工艺条件下,利用CO2激光对铁磁Fe73.5Cu1Nb3Si13.5B9非晶带进行了辐照处理,诱导非晶带样品发生纳米晶化。应用穆斯堡尔(Mossbauer)谱(MS)、透射电镜(TEM)和X射线衍射(XRD)对实验样品的晶化工艺、纳米晶相的组织结构、晶化量和纳米晶化机理等进行了研究。结果表明,晶化析出相是αFe(Si)单相固溶体,具有4种超精细结构;其晶粒尺寸约为10～20nm;纳米晶均匀分布在非晶基体上,形成非晶相与纳米晶化相的双相组织结构。随着激光功率的增加,纳米晶化量随着增加,可通过控制激光处理工艺参量,来实现纳米晶化量的控制。更多还原

【Abstract】 Ferromagnetic Fe 73.5Cu₁Nb₃Si 13.5B₉ amorphous ribbon samples were exposed to CO₂ laser irradiation with various powers （150 W,200 W,250 W,300 W） and the same scanning speed （20 mm/s） in order to produce nanocrystalline phase on the surface of amorphous Fe 73.5Cu₁Nb₃Si 13.5B₉. The nanocrystallization of amorphous Fe 73.5Cu₁Nb₃Si 13.5B₉ radiated by CO₂ laser is studied by means of Mssbauer spectra （MS）, transmitance electron microscope （TEM） and X-ray diffraction （XRD）. The crystalline phase is α-Fe（Si）,it has four hyperfine structure , and the size of which is about 10～20 nm; the nanocrystalline evenly distributes in the amorphous matrix to form the amorphous and crystalline composite structure. The amount of crystallization along with laser energy increases. The control of the nanocrystal phase quantity can be gotten with the control of the laser treatment process parameters.更多还原