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Vol.36, No.4, 494 ~ 502, 1998
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| Title |
| Superplastic Behaviors of Al-Mg-X ( X=Cr , Zr , Mn ) Alloys |
| 맹덕영 , 홍순익 , 천병선 Duck Young Maeng , Sun Ig Hong , Byong Sun Chun |
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| Abstract |
| In this study, the high temperature superplastic deformation behavior of Al-Mg-X(X:Cr,Zr,Mn) alloys were investigated. The effect of the transition elements and thermomechanical processing on the microstructure and superplastic behavior of Al-Mg-X alloys were also examined. Various intermetallic particles were distributed randomly throughout the matrix and large particles were observed frequently at grain boundaries, suggesting they are effective in refining grain size. In Al-Mg-Cr alloy which was thermomechanically processed with an intermediate annealing, the maximum elongation (close to 730%) was observed at 530℃. The strain rate at which the maximum elongation occurred was faster in Al-Mg-Cr(1x10^(-3)/sec) alloy than in Al-Mg-Mn(1x10^(-4)/sec) alloy. In Al-Mg-Zr alloy, the maximum elongation was observed at 500oC when it was thermomechanically processed without an intermediate annealing and annealed at 530℃ before testing. The observation of the maximum elongation at a lower temperature (500℃) in Al-Mg-Zr alloy may be associated with the finer size of dispersoids in this alloy. The superplastic behavior of Al-Mg-X alloys was found to be greatly influenced by the nature of intermetallic particles. |
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