6016铝合金热变形实验模拟热轧显微组织演变(英文)

采用Gleeble-1500热模拟机研究6016铝合金单道次高温压缩变形时的显微组织演变。采用光学显微镜和透射电子显微镜分析合金在不同变形条件下的组织形貌特征。结果表明:在高温压缩变形时,该合金的变形激活能为270.257kJ/mol,硬化指数为8.5254;流变应力双曲正弦的自然对数值与温度补偿Zener-Hollomon参数自然对数值成线性关系;合金低温、低应变速率时的主要变形组织为动态回复组织,而高温变形时产生局部动态再结晶组织;该铝合金高温变形时的主要软化机制为动态回复,只有在高温、高应变速率下发生部分的动态再结晶;合金平均亚晶粒尺寸随温度补偿应变速率Zener-Hollomon参数的升高而减小。

Microstructure evolution of 6016 aluminum alloy during compression at elevated temperatures by hot rolling emulation

Microstructure evolution of 6016 aluminum alloy during compression at elevated temperatures was studied by single-pass high temperature compression experiments on Gleeble-1500 thermal-mechanical simulator. The microstructures under various deformation conditions were also analyzed by optical microscope (OM) and transmission electron microscope (TEM). The results indicate that during hot compression deformation, apparent activation energy of the alloy is 270.257 kJ/mol, stress exponent is 8.5254, natural logarithm of hyperbolic sine flow stress of the alloy has linear relationship with natural logarithm of temperature compensation Zener-Hollomon (Z-H) parameters, and main deformed microstructures of the alloy at low temperature and low strain rate are dynamic recovery microstructures in contrast to a little geometric dynamic recrystallization microstructure within local area at high temperature. Main softening mechanism during deformation of the alloy at high temperature is dynamic recovery, while the dynamic recrystallization occurs partially only at high temperature and high strain rate. And subgrain size decreases with increase of Z-H parameter.