三维连通网状SiC陶瓷/Zr基非晶复合材料室温单轴压缩断裂行为

在室温下,利用WDW-E100D万能试验机和SEM研究了三维连通网状结构SiC陶瓷/Zr基非晶复合材料的准静态单轴压缩变形和断裂行为. 结果表明,复合材料的轴向压缩断裂强度达到了1270MPa,在压缩条件下复合材料的断裂发生在弹性变形阶段,断裂前观察不到塑性变形;试样发生纵向劈裂和剪切断裂;三维连通网状结构SiC陶瓷是主要的承载单元,断口形貌为层片状、台阶式的解理断裂;非晶合金发生粘性流动,在变形过程中形成纹脉状断口形貌,出现典型的热软化效应.

Quasistatic Mechanical Properties of 3D-Net SiC/Zr-Based Amorphous Matrix Composites at Room Temperature

The deformation and fracture behaviors of 3D-net SiC/Zr-based amorphous matrix composites have been investigated with the WDW-E100D testing machine and scanning electron microscopy(SEM) under monaxial compression at room temperature.It is found that,the compressive strength of the composites reaches 1?270?MPa.Under compressive loading,the samples exhibit elastic deformation followed by catastrophic failure without obvious yielding.The mode of failure of the composites is a mixture combining splitting and shear fracture.The 3D-net ceramic is the dominating cell bearing the weight;the microcosmic failure mechanical are typical cleavage fracture of 3D-net SiC,and inhomogenous flow deformation of amorphous alloys viscous flow traces,vein patterns and localized melting can be seen on the fracture surface of the amorphous alloys matrix.