Impact Fracture Energy of Bulk Amorphous Zr55Al10Cu30Ni5 Alloy

Publisher Website
Google Scholar
Abstract
The impact fracture energy and stress for the bulk amorphous Zr55Al10Cu30Ni5 alloy were measured by using the Charpy test specimen with U-shape notch. The maximum stress and displacement at the impact fracture are 1615 MPa and 0.44 mm, respectively, and the impact fracture energy is measured to be 63 kJ/m2. The impact fracture stress is nearly the same as the static tensile fracture strength (\fallingdotseq 1570 MPa) obtained in a wide strain rate range of 10−4 to 10−1 s−1 for the Zr-based bulk amorphous alloy. The impact fracture energy is higher than those (12 to 36 kJ/m2) for newly developed Al-based high-strength alloys which have been used in some application fields. The fracture surface appearance changes from the vein pattern in the region near the U-shape notch to an equiaxed dimple-like pattern in the inner region. The first evidence of the high impact fracture energy is important for development of the Zr-based bulk amorphous alloy as a new engineering material.