Quasi-Static and Dynamic Deformation Behavior of Zr-Based Amorphous Alloy and Amorphous Matrix Composite

摘要

Quasi-static and dynamic deformation behavior of a Zr-based amorphous alloy and an amorphous matrix composite containing dendritic beta phases was investigated in this study. Quasi-static and dynamic compressive tests were conducted using a universal testing machine and a compressive Kolsky bar, respectively, and then the test data were analyzed in relation to microstructure and fracture mode. Quasi-static compressive test results indicated that the compressive strength of the amorphous composite was similar to that of the amorphous alloy while the ductility was better than that of the amorphous alloy. Under dynamic loading, the maximum shear stress and ductility of the amorphous alloy and composite were considerably lower than those under quasi-static loading because of the decreased resistance to fracture. The deformation and fracture behaviors occurring under quasi-static and dynamic loading conditions were explained, by fracture mechanisms. Deformation under dynamic loading lowered strain and compressive strength because of the reduced fracture resistance, and the composite alloy showed more excellent compressive strength and ductility than the alloy. These findings consequently suggested that applying the evaluation criteria for mechanical properties measured under quasi-static loading could cause risks when Zr-based amorphous alloys were used under dynamic loading conditions.