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논문 기본 정보

자료유형
학술저널
저자정보
E. Vaghefi (Sharif University of Technology) S. Serajzadeh (Sharif University of Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.11
발행연도
2021.11
수록면
4,368 - 4,382 (15page)
DOI
10.1007/s12540-020-00755-0

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초록· 키워드

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In this work, deformation behavior of AA2017-T4 at elevated temperatures was studied employing uni-axial tensile andcreep experiments. Tensile tests were carried out at temperatures varying 150?500 °C under different strain rates then, acombination of neural network and dynamic material modeling was utilized to construct the processing maps. Furthermore,creep experiments were conducted to assess inelastic deformation behavior of the alloy at temperatures between 150 and225 °C and stresses in the range of 150 to 230 MPa. Microstructural evaluations were carried out for determination ofmicrostructural changes and formation of voids and cavities within the samples. The results showed that dynamic precipitationcould occur during deformation at temperatures 175?225 °C leading to negative strain-rate sensitivity at true strainslarger than 0.1. The main softening process was detected as dynamic recovery at temperatures higher than 250 °C however,dynamic recrystallization could also occur at low strain rates and temperatures higher than 400 °C. The activation energiesfor hot deformation were computed as 380.6 kJ mole?1 at 250?350 °C and it was reduced to 224.7 kJ mole?1 for the rangeof 350?500 °C. This showed the hard particle could significantly change rate of flow softening. The creep activation energywas determined as 169.5 kJ while the stress-exponent varied between 5.5 and 10.1 at temperatures between 150 and 225 °Cindicating that dynamic recovery controlled by dislocation climb could be the governing creep mechanism.

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