Investigation of Intermetallic Compound Formed from Rapid Solidification of Al-Ti-RE Alloy  

作　　者：杨明珊 王振飞 

机构地区：[1]College of Information Engineering, Zhengzhou University, Zhengzhou 450052, China

出　　处：《Journal of Rare Earths》2004年第2期311-314,共4页稀土学报（英文版）

基　　金：ProjectsupportedbyNationalAdvancedMaterialsCommitteeofChina ( 715 2 6 0 2 0 2 )

摘　　要：Al-Ti alloy containing rare earth elements can produce fine, uniform dispersion intermetallic phase through rapid solidification (RS) technology. RS Al-Ti-RE alloy can be designed for applications at elevated-temperature since the intermetallic compound has good thermal stability. A transmission electron microscopy investigation shows the intermetallic phase has a diamond cubic structure (a=1.47736 nm), with space group Fd3m. The chemical stoichiometry is Al_(20)Ti_2La. The particle is formed from the melting directly, prior to other phases, and the nucleus is formed from icosahedrons composed with twenty tetrahedrons. Twin crystal structure plays an important role in the nucleation stage.Al-Ti alloy containing rare earth elements can produce fine, uniform dispersion intermetallic phase through rapid solidification (RS) technology. RS Al-Ti-RE alloy can be designed for applications at elevated-temperature since the intermetallic compound has good thermal stability. A transmission electron microscopy investigation shows the intermetallic phase has a diamond cubic structure (a=1.47736 nm), with space group Fd3m. The chemical stoichiometry is Al_(20)Ti_2La. The particle is formed from the melting directly, prior to other phases, and the nucleus is formed from icosahedrons composed with twenty tetrahedrons. Twin crystal structure plays an important role in the nucleation stage.

关 键 词：metal materials rapid solidification intermetallic compound elevated-temperature alloy rareKey words: lanthanides 4-alkoxybenzoates thermal behaviour synchrotron measurements METALLOMESOGENS rare earths 

分 类 号：TG13[一般工业技术—材料科学与工程]