Algendy Ahmed Y, Rometsch Paul, Chen X-Grant
Department of Applied Science, University of Quebec at Chicoutimi, Saguenay, QC G7H 2B1, Canada.
Arvida Research and Development Center, Rio Tinto Aluminium, Saguenay, QC G7S 4K8, Canada.
Materials (Basel). 2025 Apr 9;18(8):1701. doi: 10.3390/ma18081701.
The influence of annealing temperature on the mechanical properties, microstructural evolution, and recrystallization behavior of AA5083 cold-rolled sheets with and without Sc/Zr microalloying was studied utilizing hardness tests, optical microscopy, electron backscatter diffraction, and transmission electron microscopy. The results show that a minor addition of Sc/Zr to the Al-Mg-Mn alloy can significantly improve the alloy strength and recrystallization resistance. Adding 0.1 wt.% Sc and 0.08 wt.% Zr raised the recrystallization temperature of heavily deformed sheets to 500 °C, which is 250 °C higher than for the Sc-free base alloy. The higher recrystallization resistance of the Sc-bearing alloy was mainly attributed to the presence of Al(Sc,Zr) nanoparticles, which enhanced the Zener drag pressure and delayed recrystallization. Grain boundary strengthening effects at various annealing temperatures were estimated using a constitutive equation. This work revealed that grain structure change and the corresponding boundary strengthening effect are key factors governing alloy strength evolution during annealing.
利用硬度测试、光学显微镜、电子背散射衍射和透射电子显微镜，研究了退火温度对含和不含Sc/Zr微合金化的AA5083冷轧板材力学性能、微观组织演变及再结晶行为的影响。结果表明，向Al-Mg-Mn合金中少量添加Sc/Zr可显著提高合金强度和抗再结晶能力。添加0.1 wt.%的Sc和0.08 wt.%的Zr可将严重变形板材的再结晶温度提高到500°C，比不含Sc的基体合金高250°C。含Sc合金较高的抗再结晶能力主要归因于Al(Sc,Zr)纳米颗粒的存在，其增强了齐纳拖拽压力并延迟了再结晶。使用本构方程估算了不同退火温度下的晶界强化效果。这项工作表明，晶粒结构变化及相应的晶界强化效果是控制退火过程中合金强度演变的关键因素。
