Metals and Materials International ( IF 3.3 ) Pub Date : 2021-09-03 , DOI: 10.1007/s12540-021-01025-3 Chaoyang Li 1, 2 , Guangjie Huang 1 , Lingfei Cao 1, 3 , Yu Cao 1 , Ruoxi Zhang 2 , Lin Lin 2 , Bin Liao 4
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Abstract
The microstructure evolution and hot deformation behavior of a Li-containing aluminum alloy AA2060 with different initial microstructure (homogenized vs. pre-rolled) were studied by isothermal hot deformation. The tests were performed within a wide range of deformation temperatures of 370–490 ℃ and strain rates of 0.01–10 s−1. Results show that the stress drop ratio of the pre-rolled specimen is higher than that of the homogenized one under the same deformation condition. Microstructure were analyzed on the thermal processing maps in unstable and optimum processing domain, and a higher dynamic recrystallization fraction can be observed in the pre-rolled specimen that has more substructures and smaller grains. Four types of the dynamic recrystallization were observed and the mechanism for deformation softening was discussed in this work.
Graphic Abstract
中文翻译：
初始组织对AA2060铝合金热变形行为及组织演变的影响
摘要
通过等温热变形研究了具有不同初始组织（均质与预轧）的含锂铝合金 AA2060 的组织演变和热变形行为。测试在 370-490 ℃ 的大范围变形温度和 0.01-10 s -1 的应变速率下进行. 结果表明，在相同变形条件下，预轧试样的应力下降率高于均质试样。在不稳定和最佳加工区域的热处理图上分析了显微组织，在具有更多子结构和更小晶粒的预轧试样中可以观察到更高的动态再结晶分数。观察了四种类型的动态再结晶，并讨论了变形软化的机制。
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