形变Cu-17．5％Fe原位复合材料热稳定性研究

形变Cu-17．5％Fe原位复合材料在低于400℃退火，其力学性能和电性能变化不大．在高于450℃退火，随加热温度升高，强度和杨氏模量下降，电阻率提高．用扫描电镜观察了Fe纤维形态的变化，测定了Fe纤维断开的有关数据，并进行了数值模拟．结果指出，Fe纤维形状从片状到颗粒状变化可能有三种历程：直接边缘球化；晶界分裂→柱状化→Rayleigh扰动；直接柱状化→Rayleigh扰动．并分析获得其计算模型，经计算比较，和实验值具有很好的一致性．

Thermal Stability of Deformation-Processed Cu- 17.5%Fe in Situ Composite

The changes in mechanical and electrical properties of deformation-processed Cu- 17.5%Fe in situ composite resulting from annealing were measured. The results indicates that the strength decreases and electrical resistivity increases with increasing annealing temperature. The shape changes of Fe filaments in deformation-processed Cu-17.5%Fe in situ composite during annealing were observed by optical microscopy and scanning electron microscopy. The results found that the instability of Fe plates has three processes: edge spheroidization, longitudinal splitting plus cylinderization plus Rayleigh perturbation, and direct cylinderization plus Rayleigh perturbation. The breakup kinetics of Fe filaments were monitored by quantitative metallography. Experimental results were compared with existing models and the appropriate physical model for breakup of filaments was established.