Effect of Solution and Aging Process on Microstructure and Properties of Rgo/Al Matrix Composite
In present work, the effect of solution and aging process parameters on microstructure and properties of graphene reinforced aluminum matrix composites was investigated. The results indicated that as the solution temperature and time increases, the average grain size of the RGO/Al matrix composite decreases firstly and then increases, while the microhardness increases firstly and then decreases. The lattice distortion and grain refinement caused by alloy elements solution are the main strengthening mechanisms. With the increase of aging temperature and aging time, the average grain size gradually decrease to a certain stable value, while the microhardness increase firstly and then decrease. The CuAl2 dispersed distribution in matrix is the main reason for the microstructure refinement and hardness increase. The optimized solution treatment parameters were 510°C×40min, and the optimized aging treatment parameters were 190°C×12h 1 . INTRODUCTION Due to the low density, high strength, medium plasticity in quenching and quenching conditions, good spot welding and good machinability, Al-Cu-Mg aluminum alloy is widely used in aerospace and automotive industries [1]. In order to further increase the hardness, a method of adding a reinforcing phase, such as SiC, whisker or carbon fiber, is often employed. The graphene oxide (GO) has high strength (125 GPa), high modulus (about 1.0 TPa), large specific surface area (about 2630 m 2 g -1 ) and excellent elongation properties [2,3]. Because of a large number of hydrophilic groups presenting on the surface, such as hydroxyl groups and carboxyl 1 Linli Hu, Department of Materials and Engineering, Jiangxi Vocational College of Mechanical and Electrical Technology, Nanchang, China, 330013