文档介绍：Trans. Nonferrous Met. Soc. China 23(2013) 35683574Microstructural evolution of AlZnMgZr alloy withtrace amount of Sc during homogenization treatmentBo LI 1, Qing-lin PAN1,2, Yun-jia SHI1, Chen LI1, Zhi-min YIN1 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education,Central South University, Changsha 410083, ChinaReceived 20 July 2013; accepted 25 October 2013Abstract: The microstructural evolution of AlZnMgZr alloy with trace amount of Sc during homogenization treatment wasstudied by means of metallographic analysis, scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and differentialscanning calorimetry (DSC). The results show that serious dendritic segregation exists in studied alloy ingot. There are many eutecticphases with low melting-point at grain boundary and the distribution of main elements along interdendritic region varies Zn, Mg and Cu distribute unevenly from grain boundary to the inside of alloy. With increasing the homogenizationtemperature or prolonging the holding time, the residual phases are dissolved into matrix α(Al) gradually during homogenizationtreatment, all elements e more homogenized. The overburnt temperature of studied alloy is °C. When homogenizationtemperature increases to 4