含氧高磁导率Ni基合金透射电镜研究

TEM RESEARCH OF HIGH PERMEABILITY OXYGEN CONTAINING Ni-BASE ALLOY

采用EM400型透射电镜,研究了含氧Ni-Fe磁性合金的微观组织。在氧含量达到临界值的合金中,层错缺陷很少,层错宽度很窄,存在有大量全位错,而在低氧的合金中,恰适相反。笔者认为氧含量超过临界值,才有较大几率与层错复合,形成“含氧层错”,因而附加了新的表面能,使两不全位错收缩以至形成束集。这有利于交滑移的进行,从而,为适宜的形变织构形成及再结晶立方织构的完善发展创造了先决条件。立方织构具有最高的磁性。

The microstructrues of a magnetic Ni-Fe alloy with various oxygen contents were investigated by EM400 transmission electron microscope. In the alloys containing oxygen over the critical [value, there are rare stacking faults whose width is vary narrow and a lot of dislocations; but in the alloys containing lower oxygen there are a lot of stacking faults which are wider than the former. It is suggested that only when oxygen content is over the critical value, could oxygen have more possibility to combine with a stacking fault and form the oxygen-stacking fault complex. Therefore,a new kind of surface energy is added to the stacking fault energy. Thus the extended dislocation will be reduced to form a constriction and realize the cross-slip of the dislocation. This is an important condition to form the proper deformation texture and recrystallization texture--cubic texture which corresponds to the optimum permeablity.