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 w as 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 moveme nt and reactions. The first part of the strain is characterized by wor k hardening expressed by the exponent ''n'' the second part by the loc al strain in the neck. For high temperatures in the investigated regio n 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.