论文部分内容阅读
采用渗流铸造法制备了含不同体积分数W纤维的W_f/Zr基非晶合金复合材料,其中W_f体积分数分别为47%、66%、77%和86%。研究了W_f体积分数对Zr基非晶复合材料室温准静态压缩力学性能以及变形行为的影响。结果表明:随W_f体积分数的增加,W_f/Zr基非晶复合材料的屈服强度单调增大,塑性应变先增大后减小,W_f体积分数为66%时塑性应变最大,W_f/Zr基非晶复合材料塑性应变的变化主要取决于非晶基体和W_f相互作用的程度。随着应变量的增大,基体中剪切带的数量和密度也随之增大,主剪切带向大于45°方向偏转。由于压头的影响,W_f/Zr基非晶复合材料压缩过程中样品端部和中部的受力状态不同,导致两部分的剪切带方向也明显不同。随W_f体积分数的增大,W_f/Zr基非晶复合材料的断裂方式由剪切断裂向纵向劈裂转变,断裂行为符合摩尔库伦准则。
The W_f / Zr-based amorphous alloy composites with different volume fractions of W fibers were prepared by the seepage casting method. The volume fractions of W_f were 47%, 66%, 77% and 86% respectively. The effect of W_f volume fraction on the quasi-static compressive mechanical properties and deformation behavior of Zr-based amorphous composites at room temperature was studied. The results show that with the increase of W_f volume fraction, the yield strength of W_f / Zr-based amorphous composites monotonically increases, the plastic strain first increases and then decreases, the plastic strain reaches the maximum at a W_f volume fraction of 66% The change of plastic strain of crystalline composite material mainly depends on the degree of interaction between amorphous matrix and Wf. As the amount of strain increases, the number and density of shear bands in the matrix also increase, and the main shear band deflects to more than 45 °. Due to the influence of the indenter, the stress state of the end and the middle of the sample during the compression process of W_f / Zr-based amorphous composites are different, which leads to the obvious difference of the shear bands in the two parts. With the increase of volume fraction of W_f, the fracture mode of W_f / Zr-based amorphous composites changes from shear fracture to longitudinal fracture, and the fracture behavior accords with the molar coulomb criterion.