Ti和C对铝晶粒细化的作用

EFFECTS OF TITANIUM AND CARBON ON THE GRAIN REFINEMENT OF AIUMINIUM

为在高纯铝(99.99％)中获得细小的等轴晶组织,铁的加入量必须达到包晶反应的最低成分0.15％Ti。然而在工业纯铝(99.7％)中存在的杂志元素显著降低了得到同样细小晶粒所必须的钛含量。以新开发的Al-Ti-C中间合金的形式加入到Al99.7中的TiC使得α—Al在TiC基本上生核得以实现。

In order to generate fine equiaxed grains in superpure aluminium(99.99)titanium additions must approach the peritectic composition of 0.15％ Ti. However, the presence of impurity elements in commercially pure aluminium (99.7)remarkably lowers this addition rate of titanium for obtaining similar grain size. TiC added via a new Al-Ti-C master alloy indigenously developed in the laboratory acts as a substrate for the nucleation of aluminium crystals.