Nd-Fe-B合金定量相分析的穆斯堡尔效应研究

用穆斯堡尔效应对Nd₁₅Fe_85-xB_x(x=0,2,4,8,11)合金的物相进行了定量计算,并讨论了硼在决定合金的相组成进而影响合金磁性能方面的作用.实验结果表明,随B含量的增加,合金中四方相的量逐渐增加.在x=8处达到极大值.根据四方相的量及磁矩取向度计算了合金的剩磁,计算值与实验值很好地吻合.

QUANTITATIVE PHASE ANALYSIS OF Nd-Fe-B ALLOYS BY MÖSSBAUER EFFECT

The quantitative phase analysis of Nd₁₅ Fe_85-x(x=0, 2, 4, 8, 11) alloys have been studied by the Mössbauer effect. The effect of boron content on the phase construction which influences the magnetic properties of Nd-Fe-B alloys is discussed. It is found that the quantity of the tetragonal phase increases (x<8) with increase of the boron content, reaches the maximum at x=8, and then decreases (x>8). In the Nd₁₅Fe₇₇B₈ phase, which has optimal magnetic properties, the relative quantities of the tetragonal phase, the B-rich phase and the Nd-rich phase are 84.6%, 4.6% and 10.8% respectively. The remanence of the alloys was estimated from the data of the quantity of the tetragonal phase and magnetic moment orientation degree. The calcalated results accord with those of the experiments.