5083铝合金静态再结晶行为研究

Study of Static Recrystallization Behavior of 5083 Aluminum Alloy

摘要: 本文采用Gleeble热模拟实验、金相实验、硬度实验验，研究了热变形条件及热处理条件对5083铝合金静态再结晶行为的影响。研究结果表明：5083铝合金热变形过程中Zener-Hollomon参数值越大或变形程度越大，则合金在后续退火过程中的再结晶速率越大，再结晶后的晶粒尺寸越细小；热变形后的退火温度越高，则合金在退火过程中的再结晶速率越大，但退火温度对合金再结晶后的晶粒尺寸影响不明显；随着退火时间的延长，合金金相组织从纤维状转变为等轴状，进一步延长退火时间后晶粒将发生长大现象。根据实验结果建立了5083铝合金静态再结晶动力学方程。

Abstract: This paper examined the effects of hot deformation conditions and heat treatment conditions on the static recrystallization behavior of 5083 aluminum alloy, using Gleeble thermal simulation experiment, metallography experiment and hardness test. The results indicate that with the rising of Zener-Hollomon parameter value or deformation amount during 5083 hot deformation process, the recrystallization rate increases and the recrystallized grain size of the alloy becomes finer. Moreover, the increase of annealing temperature after hot deformation can promote the recrys-tallization rate while annealing temperature has no obvious effect on the recrystallized grain size of the alloy. Microstructure of the alloy develops from a fibrous structure into an equiaxed one with the increase of holding time, and grain growth appears with the increase of time. The kinetics equation of static recrystallization of 5083 aluminum alloy was established based on the experi-mental results.