발간논문

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Vol.33, No.8, 1060 ~ 1069, 1995
Title
Study on the Superplastic Characteristics of Ti - 6Al - 4V Alloy by Load Relaxation Test
이승복S . B . Lee, 김지식J . S . Kim, 장영원Y . W . Chang, 이종수C . S . Lee
Abstract
A study has been made to investigate the superplastic deformation behavior of Ti-6Al-4V alloy based on the theory of inelastic deformation which consists of two mechanisms; the grain matrix deformation and the grain boundary sliding. Load relaxation tests were performed in the temperature ranges from 600℃ to 927℃ to obtain stress-strain rate curves for the samples having 2.5㎛-16㎛ grain sizes. Superplastic deformation tests were also carried out to verify the superplastic deformation behavior. The results showed that grain matrix deformation was dominant at 600℃ and grain boundary sliding became dominant above the temperature of 800℃. The grain matrix deformation behavior was far apart from the power law creep, but found to be rather consistent with the state equation based on the dislocation dynamics. Because of rapid grain coarsening which led to early cavity formation, the tensile elongation became smaller at 900℃ rather than at 800℃.
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