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- Title
The Dynamic Recrystallization in a Hot-Compressed Al-Zn-Mg-Cu-Sc-Zr Alloy: The Role of Strain Rate.
- Authors
Zhihao Zhao; Jiwu Huang; Yonggang Chen; Shichao Liu; Chenglong Xu; Guofu Xu
- Abstract
The effects of strain rates (0.001-1 s-1) on the microstructures and mechanical performance of the novel Al-Zn-Mg-Cu alloy through hot compression at 300 °C are investigated in detail. With the increase of strain rate, the dislocation density increases from 0.06 × 1013 to 3.77 × 1013m-2, which promotes the dynamic precipitation kinetics. And the volume fraction of η precipitates is calculated by the differential scanning calorimetry curves increasing from 1.36% to 3.94%. Both dislocations and precipitates promote to increase the hardness of the Al-Zn-Mg-Cu alloy. The large number of η precipitates in high-strain-rate samples hinders the recrystallization process by impeding the movement of dislocations and grain boundaries, decreasing the volume fraction of recrystallized grains to 3.1%. Continuous/discontinuous dynamic recrystallization occurs preferentially at low strain rates, and discontinuous dynamic recrystallization is rarely observed in high-strain-rate samples. In addition, because the process of continuous dynamic recrystallization promotes the transformation from low-angle grain boundaries to high-angle grain boundaries, more continuous dynamic recrystallized grains and less low-angle grain boundaries can be observed in low-strainrate samples.
- Subjects
STRAIN rate; CRYSTAL grain boundaries; PRECIPITATION (Chemistry) kinetics; RECRYSTALLIZATION (Metallurgy); DIFFERENTIAL scanning calorimetry; METALLIC glasses
- Publication
Advanced Engineering Materials, 2023, Vol 25, Issue 22, p1
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.202301163