研究TB-13钛合金在β单相区热轧变形过程中不同变形量对组织演变规律的影响.进行了32％,50％,59％和75％变形量的热轧后,利用光学显微镜和透射电子显微镜观察了该合金热轧变形后的组织变化.结果表 明,TB-13钛合金在热轧变形过程中的动态再结晶发生机制是连续动态再结晶.当变形量为32％时,沿着轧制方向存在拉长的扁平状原始β晶粒,晶界平直,晶粒内部存在大量无规则位错和胞状结构位错.随着变形量的增加,晶界处形成亚晶,大量位错在亚晶界处聚集,使亚晶界角度不断增大,最终由小角度晶界转为大角度晶界,从而形成细小的动态再结晶晶粒.%Microstructure characteristic and dynamic recrystallization behavior of TB-13 titanium alloy during hot rolling were studied. The microstructure changes after 32% , 50% , 59% and 75% hot rolling reductions were observed by means of optical microscope ( OM ) and transmission electron microscope ( TEM). The results show that the dynamic recrystallization mechanism of TB-13 titanium alloy is continuous dynamic recrystallization during hot rolling. When the deformation reduction is 32% , the characteristic of micro-structure indicates that platy of original (3 grains which are elongated along hot rolling direction existed. The boundary of grain is straight and there are a quantity of random dislocations and dislocation patterns. With the increase of hot rolling deformation, the sub-grains form in the boundary of grains, and the dislocations aggregate in the boundaries of sub-grains make the angle of sub-grain boundary increased. The fine dynamic recrystallization grains are formed by the low angle grain boundary transforming into big angle grain boundary finally.
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