(1. 石油大学(华东) 机电工程系，东营 257062；
2. 石油大学(华东) 应用物理系， 东营 257062)
摘 要: 在AlMg合金超塑变形过程中，发现了一类反常的空洞演化规律，也就是空洞随真应变的增加而呈现“波浪型”的演化规律。通过对微观组织特征和力学性能曲线的综合分析，认为这种特殊的空洞演化规律，主要是动态再结晶所致，也就是动态再结晶对空洞生长具有抑制作用。通过对空洞形貌的定量图像分析，还得到了新的空洞演化模型。
关键字: AlMg合金； 动态再结晶； 超塑性； 空洞演化规律
（1. Department of Mechanical Engineering, University of Petroleum (East China),Dongying 257062, P.R.China；
2.Department of Applied Physics， University of Petroleum (East China),Dongying 257062, P.R.China）
Abstract:In the superplastic deformation of AlMg alloys, an abnormal type ofcavity evolution is found. Cavity growth manifests "wavetype" with the increasing true strain. Based on the analyses of the microstructures and the mechanical curves of deformation, dynamic recrystallization is suggested as the main reason of this special evolution type, that is, dynamic recrystallization can restrain the growth of cavity .Through the quantitative graph analysis of cavity , a new model of the cavity evolution was presented.
Key words: AlMg alloy； superplasticity； dynamic recrystallization； cavity evolution model
