Active Slip Bands Research Articles

A Slip-band Exudation Effect observed in Pure Aluminium

EARLIER work on the fatigue behaviour of aluminium − 4 per cent copper alloy had revealed that material was exuded from some of the active slip bands during the later stages of the fatigue test1. This phenomenon is generally associated with materials which are unstable under the action of fatigue stresses, for example, supersaturated solid solutions. We believe the exudation to be produced by the action of the cyclic stresses on a thin sandwich of material depleted of solute atoms by localized over-ageing.