Reinforcement with graphene nanoflakes in titanium matrix composites
Reinforcement with graphene nanoflakes in titanium matrix composites
复制标题
钛基复合材料中石墨烯纳米片的增强
DOI：
10.1016/j.jallcom.2016.11.302
复制
发表时间：
2017-03-05
影响因子：
6.2
通讯作者：
Wang, Shengqiang
中科院分区：
文献类型：
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作者：
Cao, Zhen;Wang, Xudong;Wang, Shengqiang
通过粉末冶金方法成功制备了石墨烯增强的块状钛基复合材料（TMCs）。采用湿法工艺制备了0.5 wt%的石墨烯纳米薄片（GNFs）和Ti6Al4V混合粉末。然后在700℃、150 MPa的压力下采用热等静压（HIP）对复合材料进行固结，接着在970℃以3的锻造比进行等温锻造。通过光学显微镜、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和静态拉伸试验研究了钛基复合材料的微观结构和力学性能。微观结构观察表明，石墨烯在复合材料中均匀分布，并且在钛基体和石墨烯之间的冶金界面处原位形成了TiC颗粒。与未增强的钛基体相比，0.5 wt%的石墨烯纳米薄片增强复合材料在不损失延展性的情况下强度显著提高，这表明石墨烯纳米薄片在钛基复合材料中确实可以作为极好的增强体。（C）2016 Elsevier B.V.保留所有权利。
Graphene reinforced bulk titanium matrix composites (TMCs) were successfully fabricated via powder metallurgy approach. 0.5 wt% graphene nanoflakes (GNFs) and Ti6Al4V mixture powders were prepared by a wet process. The composites were then consolidated using hot isostatic pressing (HIP) with a pressure of 150 MPa at 700 degrees C followed by isothermal forging with a forging ratio of 3 at 970 degrees C. The microstructure and mechanical properties of TMCs had been investigated by optical microscopy, SEM, TEM and static tensile tests. Microstructure observation illustrated a uniform distribution of graphene in the composite and in-situ formed TiC particles at the metallurgical interface between titanium matrix and graphene. Compared with the unreinforced titanium matrix, the 0.5 wt% GNFs reinforced composite exhibits significantly improved strength without losing ductility, which demonstrates that GNFs could actually act as superb reinforcements in TMCs. (C) 2016 Elsevier B. V. All rights reserved.