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热变形半制品的纵向裂纹在变形半制品中,实际上不存在含有气孔和疏松的不致密性金属;但是,在高合金化铝合金(AK6、AK8、AM_г5、AM_г6、B93、B95等)的热变形半制品的断口上,却常常出现明亮的或清晰而无光泽的条状区域,其面积可达数十平方毫米。研究表明,出现这种区域的原因是沿纵纤维方向的内部裂纹所致。纵向裂纹大大降低金属的横向机械性能,而对纵向性能无影响(表3)。实际上,纵向裂纹造成了分层、氧化膜及其他缺陷。“分层”
Longitudinal cracks in heat-deforming semi-finished products In deformable semi-finished products, virtually no dense metal containing porosity and porosity is present; however, in highly alloyed aluminum alloys (AK6, AK8, AM_51, AM_66, B93, B95, etc.) Thermal deformation of semi-finished products on the fracture, but often appear bright or clear and dull strip area, the area up to tens of square millimeters. Studies have shown that this area is caused by internal cracks along the longitudinal fiber direction. Longitudinal cracks greatly reduce the transverse mechanical properties of the metal, but have no effect on the longitudinal properties (Table 3). In fact, longitudinal cracks cause delamination, oxide films and other defects. “Layered”