Effect of Extrusion on Hot Deformation Behavior of Spray Formed 7055 Aluminum Alloy

MENG Yi; XIANG Jin; LIU Yan

doi:10.3969/j.issn.1674-6457.2026.02.002

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (2) : 10-20. DOI: 10.3969/j.issn.1674-6457.2026.02.002

Process Technology in the Ordnance Industry

Effect of Extrusion on Hot Deformation Behavior of Spray Formed 7055 Aluminum Alloy

MENG Yi^1,*, XIANG Jin², LIU Yan¹

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Abstract

The work aims to clarify the role of extrusion in regulating the subsequent hot deformation behavior and plastic forming performance of spray formed 7055 aluminum alloy, to provide a basis for optimizing the composite forming process path. Isothermal compression tests were conducted with a Gleeble thermal simulator on both as-sprayed and extruded 7055 aluminum alloy. The flow stress characteristics, dynamic recrystallization behavior, and hot processing performance at both states were systematically compared. Constitutive equations based on the Arrhenius-type hyperbolic sine model were established, and processing maps were constructed. The results indicated that the extrusion markedly improved the hot deformation behavior of the alloy. The hot deformation activation energy of the extruded alloy decreased by 16.9%, and the average peak stress was reduced by 8.5% compared with those of as-sprayed alloy. At 425 ℃ and 0.01 s^-1, the recrystallization fraction reached 59.5%, which was 15.2% higher than that of the as-sprayed alloy. Processing maps showed that the extruded alloy exhibited a wider safe processing window (η>0.34) with enhanced deformation stability. Extrusion optimizes the initial microstructure through porosity elimination, grain refinement, and second-phase homogenization, thereby reducing deformation resistance and promoting dynamic recrystallization during subsequent hot deformation.

Key words

7055 aluminum alloy / extrusion / hot deformation behavior / dynamic recrystallization / processing map

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MENG Yi, XIANG Jin, LIU Yan. Effect of Extrusion on Hot Deformation Behavior of Spray Formed 7055 Aluminum Alloy[J]. Journal of Netshape Forming Engineering. 2026, 18(2): 10-20 https://doi.org/10.3969/j.issn.1674-6457.2026.02.002

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