Defect and Its Influence on Mechanical Property of Titanium Diboride-Copper Matrix Composite

摘要

The TiB_2-40Cu-8Ni composite prepared by combustion synthesis is investigated. Both 2D digital radiography (DR) and 3D computed tomography (CT) are used to test the specimens non-destructively. The result shows that ceramic phase aggregation is the main defect. Then the mechanical properties of samples are assessed by means of three-point-bend test. It appears that mechanical properties are related with the distribution of TiB_2 phase and Cu phase. The scanning electron microscope (SEM) is also used to observe the crack growth of the bending test sample.