Page 199 - Fiber Fracture

184 H.U. Kunzi

of high defect densities in strain-hardened wires and amorphous ribbons give rise to
strong filaments. Polycrystalline strengthening in micro-wires and thin foils becomes
size dependent and shows deviations from the Hall-Petch relation. Fatigue of micro-
wires and thin foils is difficult to predict. It appears that this property is strongly
influenced by microstructural details and the environment. In crystalline wires with only
a few grains in their cross-section the fatigue life is strongly size dependent.

Keywords

Fracture of wires; Fracture of metallic glasses; Deformation texture; Drawing defects;
Polycrystalline strengthening; Fatigue of micro-wires; Fatigue of metallic glasses;
Bonding wires