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采用两通道夹角为90°,外圆角为20°的模具,实现了工业纯钛BC方式6道次的ECAP温变形,累积等效真应变达到6.3,并观察分析了变形试样的显微组织。结果表明:工业纯钛经BC方式6道次ECAP温变形后,获得了晶粒尺寸为150nm的具有大角度晶界的超细晶组织;工业纯钛在ECAP温变形过程中,随变形道次的增加,通过位错滑移产生的板条和不稳定的孪晶组织相互作用,大量的位错聚积成位错胞并生成亚晶;在变形温度的影响下,位错相互作用,使亚晶逐渐演变成具有大角度晶界的超细晶组织。
The ECAP temperature deformation of 6 passes of industrial pure titanium BC was achieved by adopting the mold with two included angles of 90 ° and 20 °. The true equivalent strain reached 6.3, and the deformation of the deformed specimen was observed Micro-organization. The results show that the ultrafine-grained microstructure with large-angle grain boundaries with a grain size of 150nm is obtained after 6 passes of commercial ECT by BC mode. The purity of industrial pure titanium decreases with the deformation of ECAP , The dislocations produced by the dislocations interact with unstable twins and a large number of dislocations accumulate into dislocation cells and generate subgrains. Under the influence of deformation temperature, the dislocations interact with each other, Crystals evolve into ultrafine-grained structures with large-angle grain boundaries.