在室温下以等径弯曲通道变形(ECAP)技术制备超细晶工业纯钛,采用Gleeble-1500热模拟实验机对粗晶和超细晶工业纯钛在热变形条件下的流动应力特征进行了研究.结果表明:超细晶工业纯钛在热压缩过程中,热压缩条件不同流动应力变化规律会有所差异.在较低应变速率条件下,随变形程度的增加,流动应力增加到峰值后开始下降,呈现明显的动态再结晶特征;而在较高应变速率下,呈现稳态流变特征.此外,与粗晶工业纯钛相比,超细晶工业纯钛的屈服应力显著增强.
Ultrafine-grained (UFG) commercially pure (CP) Ti was prepared by equal channel angular pressing (ECAP) at room temperature. The flow stress of coarse-grained (CG) and UFG CP-Ti during hot deformation was studied by using Gleeble-1500 simula-tor machine. The results showed that the flow stress of UFG CP-Ti would change significantly with the thermal compression conditions. At lower strain rates, with the increase of strain, the flow stress increased to a peak value and then fell down. The curves expressed the feature of dynamic recrystallization; but at higher strain rates, the feature of steady-state deformation occured obviously. In addition, the yield stress of UFG CP-Ti was distinctly enhanced compared with CG CP-Ti.
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