Abstract
Zr_<55>Cu_<30>Ni_<30>Al_<10> bulk metallic glass (BMG) is known to show high strength. However, comparing with the strength of BMG, the fatigue limit observed under 4-points bending condition higher than espected. In addition, a fatigue crack usually initiates from a corner of the tensile stress surface. After fatigue tests, fracture surfaces were observed using a scanning electron microscope (SEM). As a result, the fracture surface includes two primary regions: a crack-growth region and a final-fracture region. The crack-fatigue region is spread in concentric circles from the fracture origin part and covered completely by striation-like stripes. In addition, the stripes were discussed with attention to the point that it matches the characteristics of the striations. According to the results, stripes observed in the fatigue fracture region suggested the possibility of striations.
