论文部分内容阅读
以Zr65Al7.5Ni10Cu12.5Ag5块体非晶合金作为研究对象,采用界面压痕技术和扫描电子显微镜,分别对铸态、轧制态以及轧制-退火态试样压痕下方的剪切带形貌进行了研究。实验结果表明,铸态试样以半圆形剪切带为主,同时存在少量的射线状剪切带,并且形貌比较规则;轧制态试样的剪切带形貌变得很不规则,很难分辨半圆形和射线状剪切带,并且随着变形量的增加,剪切带形貌的不规则程度增加;轧制-退火态试样中重新出现了规则的半圆形和射线状剪切带,变形量对剪切带形貌几乎没有影响。这些结果说明,轧制态试样压痕下方剪切带形貌不规则的主要原因是轧制变形使剪切带中自由体积含量显著增加。
Taking Zr65Al7.5Ni10Cu12.5Ag5 bulk amorphous alloy as the research object, the interface indentation technique and the scanning electron microscope (SEM) were used to analyze the morphology of the shear zone under the indentation of as-cast, rolled and annealed-annealed samples Were studied. The experimental results show that the as-cast samples are dominated by semicircle shear bands with few radial shear bands and the morphology is relatively regular. The shape of the shear bands in the as-rolled samples becomes very irregular , It is difficult to distinguish between semicircular and radial shear bands. As the amount of deformation increases, the irregularities of the shear band morphology increase; and the regular semicircular shape reappears in the rolled-annealed samples Radial shear band, the deformation of the shear band morphology almost no effect. These results indicate that the main reason for the irregular shape of the shear zone under the indentation of the rolled specimen is that the rolling deformation significantly increases the free volume content in the shear zone.