热处理Cu-Nb纳米复合线的结构和织构演变

采用Gleeble-3800型热模拟试验机对熔铸态和锻态TiBw/TA15复合材料进行高温压缩变形试验，研究不同状态TiBw/TA15复合材料在变形量70%、变形温度900～1150℃、应变速率0.01～10 s~(-1)条件下的热变形行为，建立热加工图，并分析该复合材料在热变形过程中的组织性能演变规律。结果表明，熔铸态TiBw/TA15复合材料的热加工工艺窗口为温度900～1150℃,应变速率2.72～10 s~(-1);温度1000～1100℃,应变速率0.01～0.03 s~(-1);温度1075～1130℃,应变速率0.01～0.13 s~(-1)。锻态TiBw/TA15复合材料的热加工工艺窗口为温度900～975℃,应变速率0.37～10 s~(-1);温度960～1025℃,应变速率0.01～0.37 s~(-1);温度1025～1150℃,应变速率0.01～10 s~(-1)。通过对比发现，锻态TiBw/TA15复合材料的热加工工艺窗口宽，热变形加工性能优于熔铸态。

Microstructure and Texture Evolution of Cu-Nb Nanocom-posite Wire After Heat Treatment

The microstructure and texture evolution of Cu-Nb nanocomposite wire after heat treatment were characterized by the scanning electron microscope and electron backscatter diffractometer (EBSD). The recrystallization, nucleation, large angle boundary, and residual internal stress of the nanocomposite were also discussed. Results demonstrate that after the annealing treatment, the grain recovery and recrystallization occurs in the Cu-Nb nanocomposite and a small number of large angle boundaries appear. The residual internal stress becomes weaker after the annealing treatment. After annealing over 600 °C, the grains in Nb filaments are recrystallized and grow significantly. The Cu-Nb nanocomposite wire has good structural stability at high temperatures.