Microstructure evolution and dynamic recrystallization of spray-formed Al–Zn–Mg–Cu alloy under hot deformation

An experimental study of spray-formed Al–Zn–Mg–Cu alloy found that continuous dynamic recrystallization, expressed through a subgrain structure, was associated with changes in flow stress and texture during hot deformation. The reported behavior varied with deformation temperature and strain rate, with higher temperatures and lower strain rates promoting further continuous recrystallization development and reducing texture intensity.

The researchers investigated the alloy using hot uniaxial compression tests at 350–450 °C and strain rates of 0.01–1 s⁻¹. They also conducted strain-rate-jump compression tests to examine the influence of loading-rate history. These were laboratory deformation experiments on one spray-formed alloy; the available abstract does not describe replication, uncertainty estimates or the number of specimens tested.

According to the abstract, subgrain rotation driven by dynamic recovery and deformation was identified as the principal mechanism of continuous dynamic recrystallization. Three forms of low-angle grain boundaries were observed: equiaxed subgrain structures, and low-angle boundaries with preferred orientations either parallel to the compression direction or perpendicular to it. The reported orientations were also associated with grain orientation.

The strain-rate-jump tests showed an asymmetric response in flow stress and microstructure evolution to loading history, which the abstract describes as observed for the first time in hot deformation of Al–Zn–Mg–Cu alloy. The authors suggest that dislocation accumulation and the time available for rearrangement through dynamic recovery may contribute to differences from constant-strain-rate uniaxial compression. The available summary does not provide the magnitude of the flow-stress changes, quantitative texture data, detailed boundary statistics or full methodological information, so the scope of these findings is limited to the reported abstract rather than an assessment of the complete article.

Subject of Research: Hot-deformation microstructure and continuous dynamic recrystallization in spray-formed Al–Zn–Mg–Cu alloy

Article Title: Microstructure evolution and dynamic recrystallization of spray-formed Al–Zn–Mg–Cu alloy under hot deformation

Article References: Tao, L., Zhang, Z., Jia, W., Sun, C., Li, D., Jia, Z., & Zhou, G. (2026). Microstructure evolution and dynamic recrystallization of spray-formed Al–Zn–Mg–Cu alloy under hot deformation. Journal of Materials Science, 61(43), 33974-33994. https://doi.org/10.1007/s10853-026-13710-y

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DOI: 10.1007/s10853-026-13710-y

Keywords: Al–Zn–Mg–Cu alloy, spray-formed alloy, hot deformation, continuous recrystallization, dynamic recovery, uniaxial compression, strain-rate history, microstructure evolution, texture intensity, grain boundaries, Microstructure, evolution