机械合金化对W-20Cu复合材料的显微组织与性能的影响

采用机械合金化结合粉末冶金技术制备W-20Cu（vo1％）复合材料。利用扫描电镜和金相显微镜对不同球磨时间的W-20Cu复合材料显微组织进行表征，并对材料的各项物理性能进行测试。结果表明，随着球磨时间的延长，W-20Cu烧结体的组织越来越均匀，Cu相分布也越来越均匀。W-20Cu烧结体密度、收缩率、硬度、抗弯强度随球磨时间的延长而增大；球磨20h的W-20Cu复合粉烧结体热导率达到峰值（130．61Wm^-1K^-1），继续球磨，热导率减小。综合考虑所有研究结果，通过机械合金化所制备的W-Cu复合粉体可以获得具有优异综合物理性能的W-20Cu复合材料。

Effects of mechanical alloying on microstructure and properties of W-20Cu composites

W-20Cu composites were prepared by mechanical alloying with subsequent traditional powder metallurgy technique. The microstructure of W-20Cu composites was investigated by using scanning electron microscopy and metallographic microscope, and the physical properties of W-20Cu composites were measured also. Effects of milling time on microstructure and physical properties of W-20Cu composites were analyzed. The results show that with increasing milling time, the microstructure of W-20Cu composites as well as the distribution of Cu phase becomes more homogeneous, and the relative density, shrinkage, hardness and bending strength of W-20Cu composite increased. The value of thermal conductivity peaks when milling time is 20h. Considering all factors, the W-20Cu composites have great physical properties fabricated with powder by mechanical alloying.