温轧态Al─8Mg─0．2Zr合金超塑变形过程中力学行为和微观组织相关性研究  

STUDY ON THE CORRELATION BETWEEN MECHANICAL BEHAVIOR AND MICROSTRUCTURAL CHANGE IN A WARM-ROLLED Al-8Mg-0.2Zr ALLOY DURING SUPERPLASTIC DEFORMATION

作　　者：李旭红[1] 刘兴秋[1] 刘庆[1] 姚枚[1] 

机构地区：[1]哈尔滨工业大学

出　　处：《材料研究学报》1995年第1期25-28,共4页Chinese Journal of Materials Research

基　　金：国家自然科学基金

摘　　要：研究了温轧态Ａｌ－８Ｍｇ－０．２Ｚｒ合金超塑变形初期的形变促使连续再结晶（ＤＩＣＲ）过程．实验表明：合金在ＤＩＣＲ基本完成前后其力学行为和微观组织都发生明显变化，且两者间存在一定内在联系可以根据超塑变形过程中力学行为的宏观表现从工程上近似确定ＤＩＣＲ基本完成时的应变量。Deformation-induced - continuous recrystallization (DICR) was revealed in a warm rolled Al-8Mg-0.2Zr alloy during initial stage of superplastic deformation. The mechanical behavior and microstructure of alloy change obviously before and after the completion of DICR, and there exists definite relationship between them. According to the modified σ-e curve and the change of microstructure, the superolastic deformation process of this alloy can be divided into three stages. At stage I (e=0-0.65): the dislocation movement and a process of DICR should occur during this stage, it may be called as "subgrain supernlastisity".At stage Ⅱ(e = 0.65-1.10):the fine grain microstructure keeps at this stage with a slight increase in grain diameter. Deformation at this stage has the common characteristics of "fine-grain superolastisity".At stage Ⅲ (e>1.10):the formation and coalescence of microvoids occur.The values e at which the dσ/ de gets to its minimum,the m gets to its maximum and the γ gets to its upper-shelf value are almost the same(0.65-0.69).

关 键 词：Al-Mg-Zr合金 超塑性 连续再结晶 力学行为 

分 类 号：TG111.7[金属学及工艺—物理冶金] TG146.21[金属学及工艺—金属学]