Anelastic Creep Recovery of Alumina Reinforced with SiC Whiskers or Particulates

摘要

Experiments were conducted to determine the anelastic response of samples ofmonolithic A12O3 and Al2O3 composites reinforced with SiC whiskers or particulates. For each material, the load was removed during high temperature creep and the subsequent load-displacement response was recorded. The results show that the monolithic material and a composite with 5 vol% of SiC particulates exhibit no anelastic response on load removal, but there is significant anelastic recovery in composites reinforced with 15 vol% of SiC whiskers or with 15 vol% of SiC particulates. The results are interpreted in terms of the hypothesis that there is an anelastic creep recovery whenever there is some form of interconnecting network within the material. (MM).