Influence of strain rate on fracture of dispersion strengthened Al-Al4C3 systems

In the presented work the change in fracture for the Al-Al4C3 system was investigated and analyzed at temperatures from 20 to 450 degrees C and strain rates from 2.5 10(-5) to 10(-1) s(-1). At room temperatures during tensile testing the strain is controlled by dislocation movement and reactions. The first part of the strain is characterized by work hardening expressed by the exponent ''n'' the second part by the local strain in the neck. For high temperatures in the investigated region the principal mechanism keying the strain is the presence of dynamic recovery processes. Strain rate influences on fracture are analyzed. (C) 1997 Acta Metallurgica Inc. Published by Elsevier Science Ltd.