(1. 石油大學(xué)(華東) 機(jī)電工程系，東營(yíng) 257062；
2. 石油大學(xué)(華東) 應(yīng)用物理系， 東營(yíng) 257062)
摘 要: 在AlMg合金超塑變形過(guò)程中，發(fā)現(xiàn)了一類反常的空洞演化規(guī)律，也就是空洞隨真應(yīng)變的增加而呈現(xiàn)“波浪型”的演化規(guī)律。通過(guò)對(duì)微觀組織特征和力學(xué)性能曲線的綜合分析，認(rèn)為這種特殊的空洞演化規(guī)律，主要是動(dòng)態(tài)再結(jié)晶所致，也就是動(dòng)態(tài)再結(jié)晶對(duì)空洞生長(zhǎng)具有抑制作用。通過(guò)對(duì)空洞形貌的定量圖像分析，還得到了新的空洞演化模型。
關(guān)鍵字: AlMg合金； 動(dòng)態(tài)再結(jié)晶； 超塑性； 空洞演化規(guī)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
