利用压力浸渗制备出钨丝增强Zr41.25Ti13.75Ni10Cu12.5Be22.5块体非晶合金复合材料, 采用应变速率为1×10 -4 s-1的准静态压缩实验及应变速率为2×10 3 s-1的动态压缩实验的方法, 研究了在动载荷作用下该复合材料的力学性能. 结果表明: 准静态压缩时, 复合材料的强度约为1980 MPa, 与单一块体非晶合金相比并无显著提高, 而塑性提高约5倍, 达到11.5%; 动态压缩时,复合材料的最大抗压强度升至约2648 MPa, 塑性则在1.8%—7.5%之间, 复合材料的应变速率敏感指数为0.022. 在准静态压缩下, 复合材料的抗压强度受到残余热应力及钨丝失稳弯曲极限压应力的影响; 在动态压缩下, 除了热应力的影响外, 还受到钨丝剪切断裂以及复合材料正弦型弯曲行为的影响. 后两者使复合材料的抗压强度在动态加载条件下升高.
A tungsten-wires strengthened Zr41.25Ti13.75Ni10Cu12.5Be22.5 bulk metallic glass composite was fabricated by a melt infiltration cast process. Quasistatic (1×10 -4 s-1)and dynamic (2×10 3 s-1)compressive experiments are carried out for the composite and monolithic material. The results showed that the composite exhibits a compressive strength of 1980 MPa which is similar to that of the matrix, and a plastic strain of 11.5% which is 5 times of that of the matrix under quasistatic compressive deformation. Under dynamic compressive load, the compressive strength of the composite is promoted to 2648 MPa, the plastic strain is in a range from 1.8% to 7.5% and the strain rate sensitivity of the composite is 0.022. Under quasistatic condition, the compressive strength is influenced by residual thermal stress and the critical stress of the tungsten wires. Under dynamic compressive condition, besides the residual thermal stress, the main factors are the shear fracture of tungsten wires and the sinusoidal buckling of the composite.
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