石墨烯增强钛基复合材料的压缩变形行为研究

Investigation on the compressive properties of the grahpene reinforced titanium composites

摘要:

通过粉末冶金方法利用等离子电火花烧结在850℃制备了石墨烯增强钛基复合材料，并利用Gleeble-1500D研究了复合材料在室温和800℃时的压缩变形行为。研究发现：石墨烯均匀的分散在钛基体中，细化了钛基体的微观组织，提高了基体室温和高温的压缩强度和硬度。其中室温和高温屈服强度分别提高了22.87%和23.07%， 抗压强度分别提高了13.91%和28.57%，室温和高温的硬度分别提高了16.4%和10%。同时发现石墨烯和钛基体反应生成了少量的碳化钛颗粒，能对基体产生强化效应。研究结果表明石墨烯/钛复合材料可成为一种高性能的特种材料，具有潜在的工程应用价值。

Abstract:

Graphene reinforced titanium composites were prepared by spark plasma sintering at 850℃ following a powder metallurgy process. The compressive properties of the composites at room temperature and 850℃were examined using a Gleeble-1500D. It is found that graphene is well dispersed in titanium matrix, refining the matrix microstructure and improving the compressive strength and hardness of the matrix at the room and high temperatures. In particular, the yield strength at room and temeperature increases by 22.87% and 23.07% respectively; compressive strength increases by 13.91% and 28.57% respectively; hardness increases by 16.4% and 10% respectively. Meanwhile, the result indicates small portion of graphene react with titanium matrix and leads to the formation of titanium carbides and reinforce the matrix. The results presented in this work denmonstrates the graphene/titanium composite is a type of high performance material and can have potential engineering applications.