Ti-2．5Cu，Ti-3Fe，Ti-3Cr合金铸锭的偏析

Segregation of Ti-2.5Cu, Ti-3Fe and Ti-3Cr Alloy Ingots

摘要:

通过对Ti-2．5Cu，Ti-3Fe，Ti-3Cr钛合金进行微区成分和宏观成分的对比研究，得出了3种合金铸锭中合金元素宏观和微观偏析规律。在等轴晶内，3种元素含量均沿晶粒生长方向增加，其中Cu，Fe元素偏析明显，Cr元素偏析程度小；柱状晶内，Cu，Fe，Cr的含量均沿晶粒生长方向增加，但偏析均不明显；晶界处的平均Cu，Fe含量明显低于晶内，而Cr含量则远远高于晶内，Cr在晶界偏析明显。宏观方面，3种元素均向铸锭的顶部和中心富集，其中Cu和Fe的偏析程度较大而Cr的偏析程度小，径向的偏析程度比轴向严重。

Abstract:

The segregation of Ti-2.5Cu, Ti-3Fe and Ti-3Cr, in Ti-alloy ingots has been studied. It was found that in equiaxed grains, segregation of Cu and Fe is obvious and segregation of Cr is slight. In columnar grains, segregation of Cu, Fe, and Cr is slight. In both cases the contents of Cu, Fe, and Cr increase along the directions of grain growing. It is rich in Cu and Fe in grains; but it is rich in Cr at grain boundaries. In the bulk it is rich in Cu, Fe and Cr on the top and radial zone of the ingots.