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《CHINESE JOURNAL OF MATERIAL RESEARCH》 1995-01
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STUDY ON THE CORRELATION BETWEEN MECHANICAL BEHAVIOR AND MICROSTRUCTURAL CHANGE IN A WARM-ROLLED Al-8Mg-0.2Zr ALLOY DURING SUPERPLASTIC DEFORMATION

LI Xuhong;LIU Xingqiu; LIU Qing; YAO Mei(Harbin Institute of Technology)(Correspondent:YAO Mei,Professor, P.O. Box 433, Harbin Institute of Technology,Harbin 150001)  
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 (e1.10):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).
【Fund】: 国家自然科学基金
【CateGory Index】: TG146.2
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