中南大学学报（自然科学版）2017，Vol.48Issue(2)：316-324,9.DOI:10.11817/j.issn.1672-7207.2017.02.007
2E12铝合金均匀化过程微观组织演变规律
Microstructure evolutions of 2E12 Al alloy during homogenization
摘要
Abstract
The dissolution of non-equilibrium phase, element distribution characteristics and the second phase precipitation of 2E12 alloy ingot during homogenization were investigated by using scanning electron microscopy(SEM), electron probe micro-analyzing (EPMA), transmission electron microscopy(TEM) and hardness testing. The result shows that coarseternary α +θ + S eutectics continuously distribute along grain boundaries (GBs) of as-cast alloy. Serious segregations of Cu and Mg elements exist in the cast ingot, Mn element is found to be uniformly distributed. As homogenization proceeds, the ternary eutectics gradually dissolve and Cu, Mg atoms dissolve in Al matrix, while Mn and Fe atoms precipitate. During homogenization, large quantities of T phase precipitate from the matrix, meanwhile micro-hardness and conductivity of alloy increase obviously. After being homogenizated at 490℃ for 1000 h, a wide precipitate-free zone (PFZ) forms near GB.关键词
2E12铝合金/均匀化/T相Key words
2E12 Al alloy/homogenization/T phase分类
矿业与冶金引用本文复制引用
陈宇强,潘素平,易丹青,刘文辉,蔡志华,唐昌平..2E12铝合金均匀化过程微观组织演变规律[J].中南大学学报（自然科学版）,2017,48(2):316-324,9.基金项目
国家自然科学基金资助项目(51405153,51475162) （51405153,51475162）
国家重点基础研究发展计划项目(2012CB619506)(Projects(51405153, 51475162) supported by the National Natural Science Foundation of China （2012CB619506）
Project(2012CB619506) supported by the Major State Basic Research Projections of China) （2012CB619506）
