LY12CZ铝合金超塑变形时的电场效应

采用Ｈｅｙｎ截线法定量研究了外加强电场对不同工艺参数条件下未经预处理Ｌ１２ＣＺ合金超塑拉伸和胀形进的晶料尺寸及其轴比的影响，结果表明，电场使得ＬＹ１２ＣＺ铝合金超塑性变形时第二相粒子（Ａｌ２ＣｕＭｇ）析出更多，且呈弥散分布状态，为稳定组织奠定了基础，电场不仅在超塑变形的主要阶段抑制了晶粒的粗化，而且也使得晶粒在超塑变形过程中趋于等轴状态，在不同的应力状态下具有类似的作用，由此证实，电场改善了材料的

ELECTRIC FIELD MODIFICATION DURING SUPERPLASTIC DEFORMATION OF LY12CZ DURALUMIN

Quantitative examination was made of the influence of external intensive electric field on grain size and aspect ratio of grains during superplastic tension and free bulging of duralumin LY12CZ without any pretreatment by the Heyn's method. During tension subjected to electric field, more homogeneously distributed particulares of secondary phase,Al_2CuMg, may precipitate out to stabilize the microstructure and not only the coarsening of grains may be restrained in the primary stage but also the shape of grains may tend towards equiaxial state. Moreover, it is believed that the electric field improves firmly the superplasticity of LY12CZ duralumin alloy.