Wu Zhe, Zhang Yang, Jiang Haifeng, Zhao Shuai, Wang Qingnan
College of Mechanical and Electrical Engineering, Northeast Forestry University, Harbin 150040, China.
College of Science, Northeast Forestry University, Harbin 150040, China.
Materials (Basel). 2021 Sep 25;14(19):5563. doi: 10.3390/ma14195563.
W/CuAlFeNi composites were fabricated by the pressure infiltration method. The composites were compressed by means of a split Hopkinson pressure bar (SHPB) with strain rates of 800 and 1600 s at different temperatures. The microstructure of the composites after dynamic compressing was analyzed by transmission electron microscopy (TEM). Observation revealed that there were high-density dislocations, stacking faults, twins, and recrystallization existing in the copper alloy matrix of the composites. High-density dislocations, stacking faults, and twins were generated due to the significant plastic deformation of the copper alloy matrix under dynamic load impact. We also found that the precipitated phase of the matrix played a role in the second phase strengthening; recrystallized microstructures of copper alloy were generated due to dynamic recrystallization of the copper alloy matrix under dynamic compression at high temperatures.
采用压力浸渗法制备了W/CuAlFeNi复合材料。通过分离式霍普金森压杆（SHPB）在不同温度下以800和1600 s的应变速率对复合材料进行压缩。利用透射电子显微镜（TEM）分析了动态压缩后复合材料的微观结构。观察发现，复合材料的铜合金基体中存在高密度位错、层错、孪晶和再结晶。在动态载荷冲击下，铜合金基体发生显著塑性变形，从而产生了高密度位错、层错和孪晶。我们还发现，基体的析出相起到了第二相强化的作用；在高温动态压缩下，铜合金基体发生动态再结晶，从而产生了铜合金再结晶微观结构。
