Enhanced hot deformation property of Al 2 O 3 /Cu - Cr composite fabricated by internal oxidation

The plastic deformability of ODS copper (Al 2 O 3 /Cu composite) always limits its widespread commercial application. In this work, the thermodynamically metastable mono -phase CuCr alloy was used to fabricate 2.5 vol% Al 2 O 3 /Cu-0.3 vol%Cr by an internal oxidation method with a subsequent solution treatment to improve the plastic deformation ability. The influence of dissolved Cr on the hot deformation property and dynamic recrystallization (DRX) behavior of Al 2 O 3 /Cu composite was studied, and the softening mechanism of Al 2 O 3 / Cu - Cr composite was revealed. The results show that the solid solution of Cr at high temperature can significantly improve the hot deformability of Al 2 O 3 /Cu composite. The maximum reduction of peak stress of 2.5 vol% Al 2 O 3 /Cu-0.3 vol%Cr composite is 57 % lower than that of 2.8 vol% Al 2 O 3 /Cu composite. Furthermore, the DRX critical values of 2.5 vol%Al 2 O 3 /Cu-0.3 vol%Cr composite is lower than that of 2.8 vol% Al 2 O 3 /Cu composite, and the DRX occurs earlier in Al 2 O 3 /Cu - Cr composite. The strain -compensated constructive model of Al 2 O 3 / Cu - Cr composite was established with a relation coefficient (R 2 ) of 0.92, which proves the accuracy of the model. Finally, the hot processing map of Al 2 O 3 /Cu - Cr composite was constructed based on a dynamic analysis model, and the appropriate hot processing parameter of Al 2 O 3 /Cu - Cr composite was obtained with temperature of 1205 K - 1223 K and strain rate of 0.022 s -1 -0.97 s -1 . The results are beneficial to improve hot deformation property of Al 2 O 3 /Cu - Cr composite and large sized bulks fabrication.