The effect of heat treatment on hot deformation behaviour of Al 2024

Thermal Stability and Microstructure of Nanometric 2024 Aluminum Alloy Powder Obtained by Cryogenic Milling and Spark Plasma Sintering

“…The displacement rate presented two peaks; the first peak, around 140 ºC, corresponded to the rearrangement of particles and the removal of gas adsorbed on the surface of the particles during heating (in situ degassing of the powder), at the same temperature found in the vacuum curve. At this point, the samples did not show evidence of sintering, consistent with results presented in the literature 39 . The second peak, around 260 ºC, corresponded to the densification process, where the powder was compacted.…”

“…There was no difference in the microstructures of the samples degassed at the two different temperatures. The micrometric zone contained precipitates distributed inside the grains (rounded θ phases and elongated S phases 39 ), as shown in Figure 10. The precipitates measured around 20-200 nm.…”

Effect of heat treatment on hot deformation behavior and microstructure evolution of 7085 aluminum alloy

“…These explanations were also in correspondence with higher hot deformation activation energy of the alloy after solution treatment than that of the alloy after homogenization treatment. These phenomenons have been observed in 6082 Al alloy [9], 6201 Al alloy [10] and 2024 Al alloy [11]. From the above experiments and explanations, it is obvious that the flow stress of the alloy after solution treatment is significantly higher than that of the alloy after homogenization treatment under the similar compression condition, especially at low deformation temperature.…”

“…McQueen et al [10] revealed that dynamic precipitation increased the initial flow stress of Al-Mg-Si alloy and resulted in shear banding and fine polygonized substructure. Ebrahimi et al [11] found that dynamic precipitation and particles coarsen led to flow stress softening in the solid solution state while no softening in the annealed state of 2024 Al alloy. Cerri et al [12] reported that pretreatment influenced the hot deformation activation energy of 7075 Al alloy.…”

The Effect of Cooling Rate after Homogenization on the Microstructure and Properties of 2017a Alloy Billets for Extrusion with Solution Heat Treatment on the Press

“…When the homogenization process is performed in batch-type furnaces, the billets located in the centre of the batch are often cooled significantly slower than the billets at the batch edge [11]. The slow billets cooling from the homogenization temperature results in precipitation of alloying elements in the form of large particles [12][13][14].…”