TiC及Ti_2C在铝结晶过程中的核心作用

NUCLEATION OF ALUMINIUM ON TiC AND Ti_2C IN THE CRYSTALLIZATION PROCESS

将工业纯铝（９９．７％）用亚包晶成分的Ｔｉ（＜０．１５％）实行变质处理，采用电子衍射等方法研究其结晶核心，证明α－Ａｌ核心除ＴｉＣ粒子外，还存在Ｔｉ_２Ｃ。ＴｉＣ为立方晶格，ａ＝０．４３８０ｎｍ；Ｔｉ_２Ｃ为正交晶格，ａ＝１．２０ｎｍ，ｂ＝１．０６ｎｍ，ｃ＝１．

The crystallization center in commercially pure aluminium(99. 7%) castings inoculated with hypoperitectic titanium(<0. 15%) was investigated by electron diffraction. It has been found that the particles were composed of stoichiometric TiC, having cubic lattice with a=0. 4380 nm, and Ti_2C, having orthorhombic lattice with a=1. 20 nm , b=1.06 nm and c=0. 50 nm.