在超塑状态下的金属和合金材料,只要对其施加很小的外力,就能产生非常大的塑性均匀流变。这一特性得到了材料科学家们的高度重视。近二十年来国内外许多学者对超塑性变形的理论和应用研究做了许多有益的工作。超塑状态下材料所具有的这一优良变形性能也在工业上得到了实际应用,并已取得了良好的经济效益,特别是在加工那些 In the superplastic state of the metal and alloy materials, as long as it exerted a small external force, can produce a very large plastic uniform rheology. This feature has been the material scientists attach great importance. In the recent twenty years, many scholars at home and abroad have done a lot of useful work on the theory and application of superplastic deformation. The excellent deformability of the material under superplastic conditions has also been industrially practiced and has achieved good economic benefits, especially in the processing of those