论文部分内容阅读
通过应变速率跳跃模式下的单轴压缩试验,研究了含有不同体积分数B2-CuZr相的CuZr基块体金属玻璃复合材料的应变速率敏感性。结果发现,随着B2-CuZ r相体积分数的增加,在3.7×10-5 s~(-1)至3.7×10-3 s~(-1)的应变速率范围中,该复合材料的应变速率敏感指数可由负值变化为正值。但是,对于B2-CuZ r相体积分数高达约80%的复合材料,其应变速率敏感指数的正值仍然是反常的低。这一现象与B2-CuZ r相自身力学行为所呈现的有限应变速率依赖性有关,是由于变形过程中B2-CuZ r相的马氏体相变效应所致。研究结果显示,CuZr基块体金属玻璃复合材料的极限应变速率敏感性受制于B2-CuZr相。
The strain rate sensitivity of CuZr bulk metallic glass composites with B2-CuZr phases with different volume fractions was studied by uniaxial compression tests in strain rate jumping mode. The results show that with the increase of the B2-CuZr phase volume fraction, the strain of the composite in the strain rate range of 3.7 × 10-5 s ~ (-1) to 3.7 × 10-3 s ~ (-1) Rate-sensitive index changes from negative to positive. However, for B2-CuZr composites with up to about 80% volume fraction, the positive value of strain rate sensitivity index is still abnormally low. This phenomenon is related to the limited strain rate dependence of the B2-CuZr self-mechanical behavior due to the martensitic transformation effect of the B2-CuZr phase in the deformation process. The results show that the ultimate strain rate sensitivity of CuZr bulk metallic glass composites is controlled by the B2-CuZr phase.