文档介绍：Trans. Nonferrous Met. Soc. China 23(2013) 25432550Microstructural evolution during homogenization ofAlCuLiMnZrTi alloyHong-ying LI1,2, Xiong-jie SU1, Hao YIN1, De-sheng HUANG1 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. Key Laboratory of Nonferrous Materials, Ministry of Education, Central South University, Changsha 410083, ChinaReceived 25 May 2013; accepted 22 July 2013Abstract: The microstructure evolution of AlCuLiMnZrTi alloy during homogenization was investigated by opticalmicroscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), and differential scanningcalorimeter (DSC) methods. The results show that severe dendritic segregation exists in the experimental alloy ingot. Numerouseutectic phases can be observed in the grain boundary, and the distribution of the main elements along the interdendritic region variesperiodically. The main secondary phase is Al2Cu. The overburnt temperature of the alloy is 520 °C. The second phases are graduallydissolved into the matrix, and the grain boundaries e spare and thin during homogenization with increasing temperature orprolonging holding time. Homogenization can be described by a constitutive equation in exponential function. The suitablehomogenization treatment for the alloy is (510 °C, 18 h), which agrees well with the results of homogeni