Elevated temperature compressive deformation behavior of 2024Al matrix composite reinforced by sub-micro Al_2O_3 particles

The compressive behavior of sub-micro Al2O 3P （40%, volume fraction）/2024Al composite was investigated within the temperature range from 270℃ to 620℃ under various strain rates from 0.00042s -1 to 0.14s -1. Results show that the critical compression reduction of the composite presents a saddle law under the combined influence of temperature and strain rate. That means the composites exhibit better deformation ability at higher temperature with higher strain rate （445℃, 0.14s -1） or at lower temperature with lower strain rate （320℃, 0.0042s -1）.