含Er 5083合金均匀化退火过程中Al_3Er相的TEM观察  

TEM OBSERVATION OF THE Al_3Er PHASE DURING HOMOGENIZING OF THE 5083 ALLOY WITH Er ADDITION

作　　者：林双平[1] 黄晖[1] 文胜平[1] 聂祚仁[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《金属学报》2009年第8期978-982,共5页Acta Metallurgica Sinica

基　　金：国家高技术研究发展计划项目2006AA03A207和2007AA03Z514资助~~

摘　　要：对半连续铸造的Al-4.6Mg-0.7Mn-0.1Zr-0.3Er(5083)合金均匀化退火过程中析出的Al_3Er相的显微组织进行了透射电镜观察.结果表明,铸锭的均匀化退火过程中,合金中析出了大量的不同形状、尺寸的沉淀物,其中尺寸在10-50 nm之间的球形析出物为Al_3Er相,它与基体保持共格/半共格关系.计算分析得出Al_3Er粒子共格/半共格转换半径为r_t=9.44 nm,与实验结果相近.The research on scandium additions in aluminium alloys has gained some interests over the last decades, due to the precipitation of AlaSc phase particles, which have the beneficial effect on mechanical properties, weldability and corrosion resistance. But Sc is a very expensive strategic metal. Therefore, a breakthrough of the selection of RE is expected. However, only a limited number of possibilities exist in Al-based alloys for the formation of coherent strengthening particles that are thermodynamically stable and have the ordered, L12 structure. It involves the addition of some suitable alloying elements such as La, Ce, Y, Sc and especially to So, while the effects of other single elements are scarcely referred. Recent studies have considered Er as a promising alloying element in Al-alloy, and it has been shown that a small Er addition can improve the material properties in several Al-alloy systems. Most of the beneficial effects are attributed to the formation of the A13Er phase in these alloys.However, few research have been done on the effect of homogenizing treatment on the precipitation of Er modified 5083 alloy. Although the A13Sc and AI3 （Sc,Zr） particles are wildly studied, but few studies about coherency and coarsening behaviors of A13Er have been reported. The present investigation provides some information about orientation coherency behavior of A13Er phase. relationships of the precipitates with matrix and the A13Er phase precipitates during homogenizing of the Er modified 5083 alloy produced by direct chill casting were analyzed by transmission electron microscopy （TEM）.The results show that many particles with different shapes and sizes precipitate during homogenizing. Spheric precipitates with the size between 10--50 nm is A13Er phase which are good coherent/semi-coherent with matrix; the orientation relationships between matrix and the spheric precipitates are derived：[111]m//[111]sp, （llO）m//（llO）sp, （lO1）m//（lO1）sp; [011]m//[Oll]s, （lO0）m//（200）sp, where th

关 键 词：均匀化退火 AL3ER 共格/半共格 

分 类 号：TG146.2[一般工业技术—材料科学与工程]