Abstract: Cu-1.12wt%Al₂O₃ alloy is fabricated by in-situ reactive synthetic technology, and its annealing behaviors are studied by means of mechanical property measurement, fracture morphology observation and microstructure representation, respectively. The results show that the Rockwell hardness and strength of Cu-1.12wt%Al₂O₃ alloy with cold drawing deformation of 50% slightly decrease with the increase in annealing temperature, and its toughness is also improved. The fracture mechanism of the alloy is a typical ductile fracture, the size and depth of dimple increase with the increase in annealing temperature, and many tiny alumina particles are bestrewn inside dimple. The dislocation density of annealed alloy is lower than that of cold-drawn alloy. The alloy microstructure is mainly composed of deformation dislocation cells and dislocation walls at intermediate annealing temperature (873 K). After high temperature annealing (1 223 K), the subgrain structure is formed, and the merging, growth and development of subgrains can be found to be a process of original recrystallization. As a result of the dislocation of fine alumina particles and grain boundary motion, no obvious recrystallized grains exist in the matrix. The Cu-1.12 wt%Al₂O₃ alloy has a high softening resistance at elevated temperature. Key

Key words: compositematerial, Cu-1.12wt%Al₂O₃alloy, annealingbehavior, mechanicalproperty, microstructure