ZE10镁合金板的超塑变形行为

Superplastic Deformation Behavior of ZE10 Magnesium Alloy Sheet

为研究ZEl0镁合金板的超塑性能及超塑性变形过程中的组织演化特征，在200～400℃下以5．5×10^-4～2．2×10^-2s^-1的应变速率对ZE10镁合金板进行了高温拉伸试验，并对其微观组织进行了分析．结果表明：ZE10镁合金板在350和400℃拉伸时具有良好的超塑性．在350和400℃下以5．5×1014S“的应变速率拉伸，延伸率分别为227％和270％．ZE10镁合金板的原始晶粒大小为25～30μm，在超塑性变形过程中晶粒大小无显著变化，显微组织为等轴晶组织．超塑性试样拉断时，断口具有典型的空洞形貌特征．

In order to investigate the superplasticity and the microstructure evolution during the superplastic deformation of ZE10 magnesium alloy sheet, the high-temperature tensile experiments of the sheet were carried out at the temperatures of 200 to 400 0（3 and at strain rates of 5.5 × 10^-4 to 2.2 × 10^- 2 s^-1 with the microstructure of the sheet being also analyzed. The results indicate that ZE10 magnesium alloy sheet possesses good superplasticity at 350 ℃ and 400 ℃, the corresponding elongations at the strain rate of 5.5 × 10^-4 s^-1 respectively reaching 227% and 270% , that the original average grain size-25 to 30 μm--of ZE10 magnesium alloy sheet scarcely changes during the superplastic deformation, that the microstructure maintains equiaxed-grain dynamically, and that there exist typical cavities on the fracture surface when the sheet is fractured.