材料期刊网

Fe-6.5Si高硅钢是一种具有高磁导率、低矫顽力和低铁损等优异性能的软磁材料。但有序相B2和D03，尤其是D03相的出现会使高硅钢的硬度和脆性急剧升高，并对薄板的轧制加工产生非常不利的影响。由于该合金中同时存在A2、B2和D03三相，且X射线衍射峰大量重叠，给D03相的定量分析带来困难。采用直接比较法定量分析D03相的体积分数，结果表明，h+k+l为偶数时A2与B2相{hkl}晶面衍射的结构因子相同。若将A2与B2合并成一相处理，适当调整X射线衍射直接比较法的关系式，进而对D03相的特征衍射峰与三相重叠的衍射峰进行直接比较，即可计算出D03相的体积分数。

It is well known that Fe-Si(6.5% in mass percent) alloy is one kind of excellent soft magnetic materials with higher relative permeability, lower coercive force and iron loss than those of conventional industrial silicon steel(wSi < 4.5%). It is very hard to produce Fe-6.5Si alloy into thin sheet by conventional rolling method because of its room-temperature embrittlement and poor workability resulted from the formation of ordered phases like B2 and D03, especially reactions towards the D03 ordered phase. Iron-based alloys containing silicon(6.5% in mass percent) form two kinds of ordered structures of B2 and D03 on the basis of the fundamental crystal lattice of bcc. X-ray diffraction of this alloy sheet shows that a lot of X-ray diffraction peaks of these phases are superposed, which make it difficult to quantitatively analyze the fraction of D03 phase. Volume fraction of D03 phase is investigated by direct comparison method. The analysis shows that {hkl} diffraction structure factor of A2 phase is the same as that of B2 phase while h+k+l is even. Therefore, A2 and B2 phases are regarded into one, by appropriately adjusting the formula for direct comparison method for XRD ,and one can directly separate the characteristic diffraction peak of D03 phase from the superposed diffraction peak of the three phases. Using this method, the volume fraction of D03 phase is calculated.