| Aluminum and its alloys are widely used in advanced engineering fields such as aerospace,military,and petroleum due to their low density,high specific strength,and good corrosion resistance.However,with the improvement of China’s comprehensive strength,especially the rapid development of aviation,aerospace,and military equipment,the harsh performance and service conditions of aluminum and aluminum alloys can no longer meet the requirements for the use of related functional materials.Therefore,it is necessary to develop aluminum based composite materials with superior performance.Graphene,as an emerging two-dimensional material,has a unique structure,excellent mechanical and thermal properties.As a reinforcement for metal composite materials,its effect is relatively ideal,and it is expected to achieve the performance characteristics of"small addition,significant modification".This article adopts the method of high-energy ball milling and electromagnetic stirring to prepare mixed powder,and prepares a new strengthening phase Gd@r GO。Prepared using SPS method Gd@r GO Different hot-rolled and heat treated composite material samples were prepared together with r GO+Gd2O3 aluminum matrix composite material.The fracture morphology,composition,and microstructure of the composite material were characterized using optical microscopy,SEM,and other methods.The main research conclusions of this article are as follows:（1）By comparing the microstructure and properties of the 0.05 wt%r GO/6061Al composite prepared by high-energy ball milling and high-energy ball milling+electromagnetic stirring,it is found that high-energy ball milling+electromagnetic stirring can effectively reduce the agglomeration of r GO in the composite,increase the density of the material,reduce the internal gap,and improve the bonding ability of aluminum powder and r GO,which is suitable for subsequent composite powder preparation.（2）In the sintered state,with the increase of r GO content,the mechanical properties of the composite material also improve;However,after hot rolling and heat treatment,this pattern no longer exists because changes in temperature cause changes in the solubility of alloy and strengthening phases in the composite material.At this time,the content of strengthening phases is not the dominant factor in the performance changes of the composite material after hot rolling and heat treatment.（3）0.05 wt%obtained from 50%hot rolling and T6 state heat treatment Gd@r GO Compared to 0.05 wt%r GO+Gd2O3 aluminum matrix composite material,the performance has been improved to varying degrees,with 0.05 wt%Gd@r GO The strength and elongation of the composite material are 404.3 MPa and 11.3%,which are 39.4%and 61.4%higher than the T6state strength plasticity specified in the national standard;The strength and elongation of the0.05 wt%r GO+Gd2O3 composite material are 357.7 MPa and 31.7%,which are 23.3%and352.9%higher than the T6 state strength plasticity specified in the national standard.（4）By adopting appropriate hot rolling and heat treatment processes,the hardness of composite materials can be significantly improved.Among them,the T6 state Gd@r GO The highest hardness of r GO+Gd2O3 composite material is 133.5 HV and 122.7 HV,respectively.（5）The prominent points of the two composite materials prepared are different and can be selected based on the different service environments and requirements of the composite material. |
