国内外对Zn—Al超塑合金的基础研究与应用已臻成熟,但这些基础研究绝大多数采用拉伸试验,而实际应用中绝大多数成形工艺却是复杂应力状态,特别是常用的成形工艺如挤压、模锻等是三向不均匀压应力状态,因此用单向拉伸时得到的流动应力去计 At home and abroad, the basic research and application of Zn-Al superplastic alloy have matured, but the majority of these basic research uses tensile test, while most of the forming processes in practical applications are in complex stress state, especially the commonly used forming Processes such as extrusion, die forging, etc. are three-dimensional non-uniform compressive stress state, so with unidirectional stretching obtained when the flow stress