Page 198 - Fiber Fracture

Fiber Fracture
M . Elices and J . Llorca (Editors)
0 2002 Elsevier Science Ltd . All rights reserved

STRENGTH AND FRACTURE OF METALLIC

FILAMENTS

H.U. Kiinzi

Ecole Polytechnique Fe'&rale de Lausanne. Dipartemen? des Mate'riaux. CH-1015 Lausanne . Switzerland

Introduction ..................................... 185
Failure Due to Fabrication and Externally Introduced Defects ........... 185
Drawing Defects. Nonhomogeneous Microstructure and Texture ....... 185
Melt-Spinning Defects ............................. 194
Intrinsic Strength and Failurc Bchavior ....................... 200
Ideal Behavior of Metallic Whiskers ...................... 200
Polycrystalline Micro-Wires .......................... 203
Effect of Annealing and Recrystallization on the Mechanical Properties 204
Recrystallization Kinetics of the Mechanical Properties ........ 206
Recrystallization Kinetics of Young's Modulus ............. 210
Size Effect of Polycrystalline Strengthening in Thin Filaments ..... 212
Fatigue of Polycrystalline Wires ..................... 215
Fracture and Mechanical Properties of Metallic Glasses ........... 228
Elastic Behavior of Metallic Glasses ................... 229
Anelastic and Viscoplastic Behavior of Melallic Glasses ........ 231
Fracture and Plastic Deformation of Metallic Glasses .......... 231
Fatigue of Metallic Glasses ....................... 235
Acknowledgements ................................. 238
References ...................................... 238

Abstract
Fracture of metallic filaments differs in many respects from fracture of bulk samples .
Particular fabrication processes that are needed to obtain the small lateral dimensions.
may introduce specific defects and textures . Their influence on the fracture behavior
is discussed . The intrinsic strength and fracture behavior is mainly dependent on the
microstructure . The absence of crystalline defects as in whiskers. as well as the presence