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- W4303684771 endingPage "144172" @default.
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- W4303684771 abstract "The effects of re-solution, pre-stretching and double re-ageing (RPD) treatment on the microstructure and mechanical performance of 2195 Al–Cu–Li alloy were investigated. The results indicate that RPD treatment enhances the strength from ∼567 MPa with a standard T8 temper to ∼584 MPa. A simultaneous improvement in strength and ductility is attained in a PA-RPD sample processed by 510 °C × 1 h re-solution, 7% pre-stretching and 120 °C × 12 h + 155 °C × 24 h double re-ageing. The improved mechanical properties are ascribed to the re-tailor of microstructures during RPD treatment involving grain morphology, dislocation density, and precipitation feature. The PA-RPD samples with varied pre-strains exhibit no evident difference in grain size, but slightly larger than that at T8 state and much smaller than that at re-solution state. The dislocation density is mainly determined by the pre-stretching levels and suffered minor annihilation in double re-ageing. T1 precursor phases are nucleated from first-step re-ageing (120 °C), most of which are connected to pre-stretched dislocations, and then grow into well-dispersed T1 plates in second-step re-ageing (155 °C). The increased strength is dominantly attributed to the reversible finer precipitation of nano-sized T1 plates, yielding considerable precipitation strengthening, as well as higher dislocation density, producing dislocation strengthening. The improved ductility in the PA-RPD sample is mainly on account of the finer and more uniform distribution of T1 plates which enhance the plastic stability during tensile testing." @default.
- W4303684771 created "2022-10-09" @default.
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- W4303684771 date "2022-11-01" @default.
- W4303684771 modified "2023-10-18" @default.
- W4303684771 title "Effects of re-solution, pre-stretching and double re-ageing treatment on mechanical behavior and microstructure of 2195 Al–Cu–Li alloy" @default.
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- W4303684771 doi "https://doi.org/10.1016/j.msea.2022.144172" @default.
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