一、引言Cb—752(Cb—10%W—2.5%Zr)铌合金,在高温下有较高的强度,在室温下有良好的延性[1]。但这种合金的冷轨板材,表面有时呈现“鱼鳞状花纹”缺陷。这种缺陷使室温下强度提高,而塑性大大的降低。为了查明这种缺陷的本质,采用了不同的方法, I. Introduction Cb-752 (Cb-10% W-2.5% Zr) niobium alloy has high strength at high temperature and good ductility at room temperature [1]. However, this alloy cold-rolled plate, the surface sometimes show “scaly pattern” defects. This defect increases the strength at room temperature and greatly reduces the plasticity. In order to identify the nature of this defect, a different approach was adopted,