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形变模式对Ni和Ti重结晶动力学的影响

在本次网络研讨会中,我们将介绍形变模式(滚轧和扭转)对商业纯 Ni 和 Ti 中的微观结构异质性和随后的再结晶动力学的影响。在Ni中,对于给定的等效von Mises应变,与轧制样品相比,承受扭转的样品显示出更高的重结晶形核密度承受扭转的样品显示出更高的重结晶形核密度(使用EBSD扫描的Grain Orientation Spread评估),储存能量(使用EBSD扫描的Kernel Average Misorientation评估)和高角晶界的比例。另一方面,在Ti中,与扭转测试样品相比,轧制样品具有更高的重结晶形核比例,储存能量和高角晶界。这是由于轧制过程中产生的形变孪晶所导致的。与在形变样品中观察到的储存能量相比,对重结晶动力学的分析也显示出一样的趋势。还使用了平均场和相场模型对重结晶动力学和微观结构演化进行了建模,从平均场模型中获得了平均迁移率,并将其用作相场模型的输入信息。再结晶的活化能与晶界迁移率的活化能很好的相比较。

References

  • Athreya, C.N. Suwas, S. Subramanya Sarma, V. Influence of deformation mode on hot deformation behaviour of CP Ti, Materials Performance and Characterization (2019), 9(2), 43-56
  • Athreya, C.N. Mukilventhan, A. Satyam Suwas, Srikanth, V. Subramanya Sarma, V. Influence of the mode of deformation on recrystallization kinetics in Nickel through experiments, theory, and phase field model, Modeling and Simulation in Materials Science and Engineering (2018), 26, 035004
  • Athreya, C.N. Kapoor, G. Gubicza, J. Subramanya Sarma, V. Influence of mode of plastic straining on the microstructure of Ni and Ti deformed through rolling and torsion, Materials Characterization (2017) 132, 205-214
  • Athreya, C.N. Satyam Suwas, Subramanya Sarma, V. Influence of mode of deformation on microstructure