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AL-Mg-Cr 합금에서 열가공공정 및 고용강화가 초소성에 미치는 영향
정병선,홍순익,맹덕영,이병훈,전계풍 (田繼豊) 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.3
The effect of transition elements and thermomechanical processing(TMP) on the superplastic behavior of Al-7%Mg-0.3%Cr alloys were examined and correlated to the microstructural evolution during superplastic deformation. To establish an optimum manufacturing process for the enhanced superplastic properties, different processing methods such as warm rolling and cold rolling were used. In cold rolled Al-7%Mg-0.3%Cr alloys with intermediate annealing. the maximum elongation (close to 730%) was observed at 530℃. On the other hand, low temperature superplasticity was not observed in Al-7%Mg-0.3%Cr alloys with the TMP developed by McNelley because of the suppression of continuous recrystallization due to the dispersion of intermetallics. However, when these TMPed Al alloys were tested at high enough temperatures above the recrystallization temperature, the maximum elongation reached approximately 400% In this study, the possible effect of solute-dislocation interaction on the high temperature ductility was also examined. The predicted strain rate range of high ductility associated with high strain rate sensitivity due to solute strengthening coincides with the range of high temperature superplasticity of Al-Mg alloys, suggesting solute strengthening may be contributory to high temperature superplasticity of Al-Mg alloy.
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