石墨烯增强镍基粉末高温合金复合材料的力学性能

摘要

采用湿混法将石墨烯纳米片分散到高温合金粉末中,并采用热等静压十热挤压十等温锻造十热处理的方法制备出FGH96镍基粉末高温合金.结果表明:石墨烯纳米片在高温合金中分散均匀,初步发现在后续的热工艺过程中并未发生变性;添加0.1％(质量分数)的石墨烯后,室温抗拉强度和屈服强度分别提高了58MPa和43MPa,塑性从21.0％提高到37.3％;650℃条件下抗拉强度和屈服强度分别提高了58MPa和28MPa,塑性从18.5％提高到26.5％.此外对石墨烯增强FGH96镍基高温合金力学性能的作用机制也进行了进一步分析.%The graphene nanosheets were dispersed in the superalloy powder by using the wet mixing method,and then the nickel based FGH96 P/M superalloy was prepared with hot isostatic pressing (HIP) +hot extrusion(HEX) +hot isothermal forging(HIF) + heat treating(HT) processes.The results show that the graphene well disperses in the superalloy powder and keeps its original form during the following hot processing.After 0.1％ (mass fraction) graphene is added,the average room temperature tensile strength and yield strength increase by 58MPa and 43MPa respectively,and the ductility increases from 21.0％ to 37.3％;the tensile strength and yield strength at 650℃ increase by 58MPa and 28MPa,and the ductility increases from 18.5％ to 26.5％.The mechanism of strengthening and toughening reinforcement was also analyzed based on graphene reinforced FGH96 superalloy.