Metadynamic recrystallization in A5083 aluminum alloy with homogenized and as-extruded initial microstructures
Metadynamic recrystallization in A5083 aluminum alloy with homogenized and as-extruded initial microstructures
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DOI：
10.1016/j.msea.2022.142789
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发表时间：
2022-02-11
期刊：
影响因子：
6.4
通讯作者：
Yanagimoto, Jun
中科院分区：
文献类型：
--
作者：
Ding, Sheng;Zhang, Jingwei;Yanagimoto, Jun
采用多种表征手段研究了不同初始组织的A5083铝合金的静态软化行为。为了计算再结晶分数，在压缩试验中，提出了一种基于偏置屈服应力法和Hall-Petch关系的新方法，该方法比传统方法更准确，即使在初始组织复杂的情况下也适用。在应力松弛试验中，应用了我们前期研究中提出的一种方法，表明该方法适用于再结晶不完全或初始组织复杂的材料。尽管挤压后的初始组织导致了更发达的亚动态再结晶，但与均质化的初始组织相比，再结晶变得不均匀。当在夹层时间内没有卸载时，产生的外部应力加速了静态恢复，但阻碍了亚动态再结晶。讨论了对亚动态再结晶的传统观点提出挑战的新见解。首先，亚动态再结晶总是需要一段孕育时间，除非实验条件足够有利于再结晶。第二，当回复活跃时，不仅动态再结晶的晶粒和回复增强的亚晶都是后续亚动态再结晶的潜在形核。
The static softening behavior of A5083 aluminum alloy with different initial microstructures was studied using various characterization techniques. To calculate the recrystallized fraction, in the compression test, a new method based on the offset yield stress method and the Hall-Petch relationship was proposed, which is more accurate than the conventional methods and applicable even when the initial microstructure is complex. And in the stress relaxation test, a method proposed in our previous study was applied, indicating that this method could be employed in materials with incomplete recrystallization or a complex initial microstructure. Although the as extruded initial microstructure led to a more developed metadynamic recrystallization, the recrystallization became heterogeneous, compared with the homogenized initial microstructure. When the anvil was not unloaded during the interpass time, the resulting external stress accelerated static recovery but impeded metadynamic recrystallization. New insights were discussed that challenge the conventional view in metadynamic recrystallization. First, metadynamic recrystallization always required an incubation time, unless the experimental conditions were sufficiently favorable for recrystallization. Second, when recovery was active, not only the dynamic recrystallized grains but also the recovery-enhanced subgrains were the potential nuclei for the subsequent metadynamic recrystallization.