Hot deformation behavior of 0.5Y2O3/Al2O3-Cu/30Mo3SiC composites doped with reduced graphene oxide
Hanjing Zhu, Meng Zhou, Ke Jing, Baohong Tian, Yi Zhang, Xu Li, Yunzhang Li, Xianhua Zheng, Heng Li, Zipeng Ma, Yong Liu, Alex A. Volinsky, Jin Zou
Abstract
The 0.5Y2O3/Al2O3-Cu/30Mo3SiC and 0.3GO-0.5Y2O3/Al2O3-Cu/30Mo3SiC composites were fabricated by fast hot press sintering. Hot compression tests of the composites were carried out using the Gleeble-1500 simulator at 0.001-10 s-1 strain rates and 650-950 °C deformation temperatures. The effects of doped reduced graphene oxide (rGO) on the hot deformation behavior and microstructure of 0.5Y2O3/Al2O3-Cu/30Mo3SiC composites were investigated. Trace of molybdenum carbide (MoC) layers/nanoparticles formed in-situ at the rGO-Cu/Mo interface, which is beneficial to the interfacial bonding of the composite. The enhanced flow stress and activation energy of hot deformation is attributed to the addition of the rGO. The activation energy of the composites was improved by 11% with the addition of rGO. The dislocation density and texture orientation ratio decrease at higher deformation temperatures.