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-CuZr相体积分数的增加,在3.7×10-5s-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-CuZr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-CuZr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-CuZr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 (SRS) of CuZr-based bulk metallic glass composites (BMGCs) containing a B2-CuZr phase with different volume fractions was investigated by performing uniaxial compression tests in a strain-rate-jump mode.It is found that the SRS exponents of the BMGCs can vary from negative to positive in the strain-rate range from 3.7× 10-5 s-1 to 3.7× 103 s-1 with increasing of the B2-CuZr phase volume fraction.However,the positive SRS exponent of the BMGC with a higher B2-CuZr phase volume fraction up to about 80％ is still unexpectedly low.This is attributed to the limited strain-rate-dependence of mechanical behavior of the B2-CuZr phase,which is induced by the martensitic transformation effect of the phase during deformation.It is obvious that the SRS ceiling of the CuZr-based BMGCs is controlled by the B2-CuZr phase.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%