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Superplastic deformation behavior of a rapidly solidified Al-Li alloy

Title
Superplastic deformation behavior of a rapidly solidified Al-Li alloy
Authors
Koh, HJKim, NJLee, SLee, EW
POSTECH Authors
Kim, NJLee, S
Date Issued
Jan-1998
Publisher
ELSEVIER SCIENCE SA
Abstract
This study aims at investigating the superplastic behavior of a rapidly solidified Al-3Li-1Cu-0.5Mg-0.5Zr (mass%) alloy. Although rapidly solidified AI-Li alloys have the very fine grain structure desirable for improved superplasticity, unfavorable oxide morphology often prevents them from being superplastic. The results of superplastic deformation indicated that the proper thermo-mechanical treatment (TMT) of the alloy resulted in a much improved superplastic ductility, e.g, elongation of approximately 530%. In the case of testing at 520 degrees C, optimum strain rate of forming was 4 x 10(-2) s(-1), which was one or two orders of magnitude higher than that of ingot cast Al-Li alloys. Such a high strain rate was thought to be quite advantageous for the practical application of superplastic deformation of the alloy. It could also be seen that the microstructure of the deformed alloy was similar to that of the as-received or the TMT treated alloy since continuous recrystallization was accomplished by subgrain growth and the growth of primary grains was prevented by fine beta' (Al3Zr) particles. (C) 1998 Elsevier Science S.A. All rights reserved.
Keywords
superplasticity; aluminum-lithium alloys; thermo-mechanical processing; continuous recrystallization; high strain rate; rapid solidification; MG
URI
http://oasis.postech.ac.kr/handle/2014.oak/21111
ISSN
0921-5093
Article Type
Article
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 256, no. 1-2, page. 208 - 213, 1998-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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