Hot Deformation Behavior and Microstructure Evolution of High-Strength Al-Zn-Mg-Cu Alloy

Cai, Jianfei; Chen, Lin; Yang, Juan; Wang, Wen; Ding, Ben; Yang, Qingxiang; Qiao, Ke; Wang, Kuaishe

doi:10.3390/met12101695

Cited by 2 publications

(1 citation statement)

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“…The deformation temperature was between 250 °C and 450 °C, and the deformation strain rate was between 0.01 s −1 and 10 s −1 ; the findings suggest that the stress levels decreased with higher temperatures or lower deformation strain rates. Cai et al [ 18 ] investigated the isothermal compression response of an Al-Zn-Mg-Cu alloy, and the experimental data indicated that the strength of the alloy decreased with increasing temperatures and retained a proportional relationship with the strain rate. The influence of thermal deformation conditions on mechanical performance was discussed, and the results were employed to optimize the hot processing of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior of an Extruded 7075 Aluminum Alloy at Elevated Temperatures

Ye,

Xia,

Qiu

et al. 2024

Materials

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Hot compression tests were conducted to explore the deformation behavior of an extruded 7075 aluminum alloy bar at elevated temperatures. Specimens with 0°, 45°, and 90° angles along the extrusion direction were prepared. The compression temperatures were 300 and 400 °C, and the strain rates ranged from 0.001 to 0.1 s−1. The corresponding microstructures were characterized via OM and TEM, and the macroscopic texture was tested using XRD. The results indicated that the strength of the 7075 alloy decreases with higher compression temperatures and is in a proportional relationship with respect to the strain rate. During high-temperature compression, it is easier to stimulate atomic diffusion in the matrix, which can improve thermal activation abilities and facilitate dynamic recovery and dynamic recrystallization. In addition, the coarsening of precipitates also contributed to dynamic softening. When compressed at 300 °C, the stress levels of the 0° specimens ranked first, and those for the 45° specimens were the lowest. When compressed at 400 °C, the flow stresses of the specimens along three directions were comparable. The anisotropic mechanical behavior can be explained by the fiber grains and brass {011} <211> texture component. However, higher temperature deformation leads to recrystallization, which can weaken the anisotropy of mechanical properties.

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Section: Introductionmentioning

confidence: 99%