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中文摘要: 以多层石墨烯为增强体,通过熔炼锻造(MF)和粉末冶金(PM) 2种工艺分别制备出规格为Φ10 mm的石墨烯增强钛基复合材料棒材。石墨烯在凝固过程中以TiC枝晶形态析出,变形后呈细小颗粒,其中Ti和C原子比约为2∶1。石墨烯和球形钛粉经过机械合金化和变形加工,在基体中反应形成薄片层。MF工艺对应的棒材拉伸强度可达476 MPa,延伸率保持在28%; PM工艺对应的棒材拉伸强度可达487 MPa,延伸率保持在30%。PM工艺可形成尺寸较小的薄片状石墨烯增强体,强化作用提升,同时塑性没有显著下降。
Abstract:Two kinds of Φ10 mm graphene reinforced titanium matrix composites bars were prepared by melting and forging( MF) and powder metallurgy( PM) process using the multilayer graphene as the reinforcer. The dendritic TiC phase precipitated during solidification,and the phase was refined into small particles after extrusion and rolling processes. The ratio of Ti and C atoms approximated to 2∶ 1. The graphene reacted with titanium matrix forming TiC thin layers during the mechanical alloying and deformation processes. And both of the tensile properties corresponding to the MF and PM processes were tested. The results show that the ultra tensile strength( UTS) of MF process reaches to 476 MPa with 28% elongation,and the UTS of PM process reaches to 487 MPa with 30% elongation. It is indicated that the strengthening effect of the small graphene reinforced layer is more obvious,and the plasticity almost keeps in the same level as the Ti C particles.
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