DISLOCATION-OBSTACLE INTERACTIONS AND MECHANICAL-PROPERTIES OF INTERMETALLICS

The mechanical properties of materials are discussed for different con figurations of the obstacles (in series or in parallel), different dis location-obstacle regimes (exhaustion or crossing) and different obsta cle strengths (one type of obstacle or a spectrum of obstacles of diff erent strengths). The models proposed for Ni3Al are compared in what c oncerns the yield stress anomaly and the partial reversibility of the flow stress upon a decrease of the temperature.