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本文通过采用细化晶粒、增加高温相比例的方法对用于低温超塑的TC4合金薄板材的超塑性进行了研究。结果表明:在板材加工时采用低温轧制,会增加变形体内的畸变能,提高α和β晶粒的再结晶形核率;变形后720~750℃再结晶退火使α相进一步球化,最终形成两相比例差较大的、均匀细小的等轴α+β组织,经测定α晶粒直径为2~5μm,其高温持久真应变应力0.2%的数值低于31MPa。
In this paper, the superplasticity of TC4 alloy sheet used for low temperature superplasticisation was studied by means of grain refinement and increasing the proportion of high temperature phase. The results show that the low temperature rolling can increase the distortion energy in the deformed body and increase the recrystallization nucleation rate of the α and β grains. After the deformation, the α phase is further nodulized by recrystallization annealing at 720-750 ° C. Finally, A uniform and fine equiaxed α + β microstructure was formed with a large difference between the two phases. The α grain diameter of 2 ~ 5 μm was determined. The value of 0.2% of true strain stress at high temperature was lower than 31 MPa.