钛合金中亚晶的电子显微镜观察

Microscopic Examination of the Subgrain in the Ti Alloy

用透射电子显微镜观察了TC6钛合金在高温退火过程中形成的亚晶(Subgrain)。合金经850℃,920℃退火后炉冷和空冷,在初生α相晶粒内形成亚晶,多为成簇分布的狭长形状,亚晶的数量随退火后冷却速度的增加而减少。亚晶界(Subgrain boundary)是由位错构成的,亚晶的形成是多边化(polygonization)的结果。

The subgrains in TC6 alloy formed during, high temperature annealing process were examined by transmission electron microscope. The results show that the subgrains, most of which are long and narrow shape, distributed in clusters, are formed in primary α phase after the alloy is annealed at 850℃ and 920℃, then cooled in furnace and in air. The amount of the subgrains decreases as the cooling rate increases after annealing. The subgrain boundary is composed of dislocation, which is the result of polygonization.