Effect of Post-Rolling after ECAP on Superplastic Behavior of Commercial Al-Mg Alloy
Effect of Post-Rolling after ECAP on Superplastic Behavior of Commercial Al-Mg Alloy作者机构：Department of Metallurgy and Materials ScienceHanyang UniversityAnsan 425-791Korea Department of Metallurgy and Materials ScienceHanyang UniversityAnsan 425-791Korea Department of Metallurgy and Materials ScienceHanyang UniversityAnsan 425-791Korea Department of Metallurgy and Materials ScienceHanyang UniversityAnsan 425-791Korea Division of Advanced Materials Science & EngineeringHanbat National UniversityTaejon 305-719Korea
出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)
年 卷 期：2004年第22卷第Z2期
页 面：53-56页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
主 题：high superplasticity equal channel angular pressing rolling deformation mechanisms rare earths
摘 要：A commercial Al-Mg alloy was subjected to equal channel angular pressing of 4 passes with and without postrolling, and the effects of post-rolling on the deformation characteristics of the alloy at 723 K were examined. Post-rolling was found to influence the deformation behavior significantly. The deformation behavior of the alloy processed only by equal channel angular pressing was characterized by (a) localized deformation indicated by severe surface prominence and depression, (b) the strain rate sensitivity of 0.33, and (c) moderate high strain rate superplastic elongations. By contrast, that of the alloy processed by equal channel angular pressing and post-rolling (70 % thickness reduction) was manifested by (a) uniform deformation associated with grain boundary sliding throughout the sample, (b) a sigmoidal behavior showing the strain rate sensitivity of 0.45 at the intermediate strain rates in the logarithmic stress-strain rate curve, and (c) very large high strain rate superplastic elongations.
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