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- W4380854075 abstract "The local inhomogeneity along the thickness direction of the extruded plate of spray-formed aluminum alloy 7055 were investigated. The thermal extrusion process was simulated by using DEFORM-3D software to understand its formation mechanism. In order to reduce the extrusion-induced inhomogeneity and improve the mechanical properties, the evolution of the secondary phase during different heat treatments and its influence on the peak aged hardness and tensile strength of the alloy were emphatically analyzed. The results show that the strain rate and temperature during the thermal extrusion process tend to decrease from the surface to the center, which leads to the local inhomogeneity of the microstructure and properties in the thickness direction. Such inhomogeneity can be reduced by heat treatments combining long-time or slow-heating solution treatments (F2 and F3) with peak ageing at 120 °C, due to similar content of S (Al2MgCu) phase after solution treatment and η´ phase (peak-ageing) in different regions of the alloy. The alloy solution treated with a slow heating rate (F3) and then peak aged shows highest hardness and tensile strength, because the slow heating process during the solution treatment promotes the precipitation of Al3Zr particles, and there are less S (Al2MgCu) phases after solution treatment which is conducive to the η´ phase precipitation during the subsequent aging process." @default.
- W4380854075 created "2023-06-16" @default.
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- W4380854075 date "2023-07-01" @default.
- W4380854075 modified "2023-10-16" @default.
- W4380854075 title "The effects of heat treatment on the extrusion-induced inhomogeneity of spray-formed aluminum alloy 7055" @default.
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- W4380854075 doi "https://doi.org/10.1016/j.jmrt.2023.06.100" @default.
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