The acoustic emission during tensile tests is investigated for several types of aluminium alloys. It. is found that the mean square amplitude of the continuous emission is proportional to strain rate and sample length. It is assumed that the continuous emission is generated by dislocation loops, which are created continuously a t Frank-Read sources. According to this model the mean square amplitude of the continuous emission U8 is proportional to the total length of the mobile dislocations L and the size of the loops I : vz -LZ. Information about I was taken from Kuhlmann and Wilsdorf's observations of slip lines a t the surface of deformed aluminium single crystals.An mehreren Aluminiumlegierungen wird die Schallemission wiihrend plastischer Verformung untersucht. Es wird gefunden, daB das mittlere Amplitudenquadrat der kontinuierlichen Emission der Verformungsgeschwindigkeit und der Probenliinge proportional ist.Es wird angenommen, daD die kontinuierliche Emission von Versetzungen herriihrt, die gleichmiiBig von Frank-Read-Quellen ausgestoBen werden. In diesem Modell ist das mittlere Amplitudenquadrat der Emission der gesamten beweglichen Versetzungsliinge L und der LLnge I der Versetzungsschleifen proportional : 6 -LZ. Die Ergebnisse werden mit Werten der Gleitlinienlangen auf Einkristallen von Kuhlmann und Wilsdorf verglichen.
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