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金属玻璃经退火处理,其穆斯堡尔参量的变化规律以及它们所反映的材料结构的变化机制尚无定论。本文旨在研究快淬Fe_(75)Ni_3Mo_(1·5)Si_(6·5)B_(14)薄带经退火后的穆斯堡尔谱,从中探讨材料在结构弛豫过程中内部相分离的现象以及冷轧形变对结构弛豫及合金磁矩空间分布择优度的影响规律。试样为厚约30μm,宽20mm的非晶态薄带,截取成长2.5cm的小段,分别于100℃～450℃间不同温度在10~(-2)mmHg真空中恒温2h。冷轧形变是使淬态带沿带长方向经轧辊挤压,同时喷水冷却,试样伸长量约5%～7%。为了研究退火效应,另取原态及经冷轧形变的试样,同时在250℃保温10h,测得诸试样的室温~(57)Fe14.4keV透射吸收谱如图1。用改进的Hesse法对谱进行拟合,解得各退火试样中超精细场分布曲线如图2所示。各穆斯堡尔参量随退火温度T_A的变化给于图3中。
After the annealing of metallic glass, the change rules of Mossbauer parameters and the mechanism of the change of the material structure reflected by them are still inconclusive. The purpose of this paper is to study the Mossbauer spectra of the rapidly quenched Fe 75 Nb 3 Mo 1.5 Si 1.5 6.5 B 14 annealed. The phase separation of the material during structural relaxation The effect of cold deformation on the structure relaxation and the spatial distribution of the magnetic moment of the alloy. The sample was an amorphous ribbon with a thickness of 30μm and a width of 20mm. A 2.5cm section was taken and kept at a constant vacuum of 10-2 mmHg for 2h at different temperatures between 100 ℃ and 450 ℃. Cold deformation is to make the quenched belt along the length of the strip by the roller extrusion, while water cooling, sample elongation of about 5% to 7%. In order to study the annealing effect, another sample was taken from the as-formed and cold-rolled specimens, and the thermal absorption at room temperature (57) Fe14.4keV was measured at 250 ℃ for 10h. Fitting the spectra with a modified Hesse method, the solution of the ultra-fine field distribution curve of each annealed sample is shown in FIG. 2. The change of each Mössbauer parameter with the annealing temperature T_A is given in Fig.3.