Al-Zn-Mg-Cu-Zr-0.12Ce合金铸锭的均匀化退火及组织演变

发布时间：2018-07-05 07:18

  本文选题：Al-Zn-Mg-Cu-Zr-.Ce合金 + 均匀化　； 参考：《中国有色金属学报》2017年03期

【摘要】：采用光学显微镜(OM)、扫描电镜(SEM)、电子探针(EPMA)、波谱分析(WDS)、X射线衍射(XRD)以及差示扫描量热仪(DSC)等技术对Al-Zn-Mg-Cu-Zr-0.12Ce合金铸态组织及均匀化退火过程中的组织演变进行研究。结果表明:该合金铸态组织存在严重的枝晶偏析,主要由α(Al)基体、α(Al)+Mg(Zn,Al,Cu)_2非平衡共晶组织以及少量的θ(Al_2Cu)相、Al_8Cu_4Ce相、Al_7Cu_2Fe相构成;均匀化退火过程中,大量层片状共晶组织溶入基体,同时转变生成Al_2Cu Mg相;合金的过烧温度为474.87℃;合金的最佳单级均匀化退火工艺为465℃、40 h,这与均匀化动力学方程测算结果接近;合金经(435℃,8 h)+(470℃,32 h)双级均匀化退火处理后,回溶效果更好,主要残留相为难溶的Al_2CuMg相,少量含Fe杂质相以及Al_8Cu_4Ce相。
[Abstract]:The microstructure evolution of Al-Zn-Mg-Cu-Zr-0.12Ce alloy was studied by means of optical microscope (OM), scanning electron microscope (SEM), electron probe (EPMA), spectrum analysis (WDS) X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results show that there is a serious dendritic segregation in the as-cast structure of the alloy, which is mainly composed of 伪 (Al) matrix, 伪 (Al) mg (Zn-Al _ 2O _ 2) _ 2 non-equilibrium eutectic structure and a small amount of 胃 (Al2Cu) phase Al8Cu4Ce phase Al7Cu2Fe phase. During homogenization annealing, a large number of lamellar eutectic structures dissolve into the matrix, and a large number of lamellar eutectic structures dissolve into the matrix during homogenization annealing. At the same time, Al2Cu-Mg phase was transformed into Al2Cu-Mg phase, the overfiring temperature of the alloy was 474.87 鈩，

本文编号：2099440