Fatigue fracture morphologies of some Fe-based amorphous alloy wires

This work presents the. fatigue fracture morphology of some Fe-based metallic glass wires obtained from a novel fatigue testing machine that imparts compressive to tensile bending stresses. The results show three different types of fracture surface, one from 80% to 100% ductile, i.e., rough for high amplitude stress range, other is from 50% to 80% rough for medium amplitude stress range and the third is from 15% to 50% rough for low stress range; in all cases, the rest of the fractures were brittle. The first type of fracture morphology is because both sides of the wire are exposed to extremely high tensile stresses; subsequently, as the amplitude stress was decreased, the fraction of ductile fracture diminished. (C) 2002 Elsevier Science B.V. All rights reserved.