Zener-Hollomon参数对含铁锻造铝合金热变形处理过程中亚结构和织构演变的影响

摘要

研究Zener-Hollomon参数对含铁锻造铝合金(AA8011)亚结构和织构演变的影响.采用X射线织构分析、电子背散射衍射(EBSD)和光学显微镜等技术进行表征.结果表明,Zener-Hollomon参数对含铁铝合金热变形处理过程中立方织构的演变具有显著影响.增大Zener-Hollomon参数会减少热变形过程中立方织构的数量,且能加强退火过程中的颗粒诱发形核(PSN)的能力.然而,低温热变形处理会导致活性沉淀,这些细而分散的颗粒会阻碍除了产生立方大晶粒的晶核外的所有晶核.综上,在含铁锻造铝合金中,Zener-Hollomon参数与亚晶粒尺寸之间的相关性与在3xxx系列合金中观察到的类似,可以用系列推导方程描述.%The objective of the investigation is to evaluate the influence of the Zener-Hollomon parameter on substructure and texture evolution in iron-containing wrought aluminium alloys (type AA8011). Methods applied are X-ray texture analysis, electron backscatter diffraction (EBSD) and optical microscopy. The results show a serious impact of the Zener-Hollomon parameter on cube texture evolution during the thermomechanical treatment in iron-containing aluminium alloys. An increase in the Zener-Hollomon parameter reduces the survivability of cube texture during hot deformation and reinforces particle-stimulated nucleation (PSN) during the annealing process. However, thermomechanical treatment at low temperatures leads to active precipitation and as a result fine-dispersed participles tend to block all nuclei except for those producing large cube-oriented grains. It is concluded that in iron-containing wrought aluminium alloys, the general correlation between the Zener-Hollomon parameter and subgrain size is similar to that observed in 3xxx series alloys and can be described by the specific set of equations derived.