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首页> 外文期刊>Carbon: An International Journal Sponsored by the American Carbon Society >Carbonaceous nanomaterial reinforced Ti-6Al-4V matrix composites: Properties, interfacial structures and strengthening mechanisms
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Carbonaceous nanomaterial reinforced Ti-6Al-4V matrix composites: Properties, interfacial structures and strengthening mechanisms

机译：碳质纳米材料增强Ti-6Al-4V基质复合材料：性质，界面结构和强化机制

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摘要

For conventional titanium matrix composites (TiMCs), there is always a trade-off issue between enhanced strength and ductility of these materials. In this study, we explore a new design methodology by reinforcing titanium alloy matrix with carbonaceous nanomaterials and investigate the mechanisms for achieving a good balance of their strength and ductility. The TiMCs were synthesized through a low-cost powder metallurgy route using pre-mixed Ti-6Al-4V (TC4) powders and various carbon based nanofillers, including graphite powders (GPs), graphene oxide nanosheets (GONs) and graphene nanoplates (GNPs), and were further rolled at a temperature of 1173 K with a deformation of 66.7%. Among these three types of carbon reinforcing sources, the GNPs are more easily reacted with TC4 matrix and form more contents of TiC phases after sintering owing to their larger amounts of defects than those of the GPs and GONs. TiC products are identified to play a bridging role for not only connecting the TC4 matrix but also forming coherent interfaces with the TC4 matrix, thus facilitating a strong interfacial bonding of the composites. The as-rolled GNPs/TC4 composites exhibit a 0.2% yield strength of 1146.36 MPa (with an elongation of similar to 8.1%), which is 24.6%, 9.22% and 5.62% higher than those of pure TC4, GPs/TC4 and GONs/TC4 composites. The GNPs/TC4 nanocomposites show a better balance of strength and ductility than those of the other two types of nanocomposites. The synergetic strengthening mechanisms are identified to be Orowan strengthening effect, effective load transfer capability of GNPs, and in-situ formation of interfacial TiC structures, which provide optimum interfacial microstructures to achieve good mechanical properties of the TiMCs. (C) 2020 Elsevier Ltd. All rights reserved.
机译：对于常规钛基质复合材料（TIMC），总是在这些材料的增强强度和延展性之间存在权衡问题。在这项研究中，我们通过用碳质纳米材料加固钛合金基质来探讨一种新的设计方法，并研究了实现其强度和延展性良好平衡的机制。通过使用预混合的Ti-6Al-4V（TC4）粉末和各种碳基纳米填料，包括石墨粉（GPS），石墨烯纳米片（GON）和石墨烯纳米板（GNPS）通过低成本粉末冶金途径合成TIMCs。 ，并在1173k的温度下进一步滚动，变形为66.7％。在这三种类型的碳增强源中，GNP更容易与TC4基质反应，并且由于其比GPS和GON的缺陷较大，烧结后形成更多的TIC相的含量。鉴定TIC产品以仅用于连接TC4矩阵而且还具有与TC4矩阵形成相干界面的桥接作用，从而促进复合材料的强界面键合。轧制的GNPS / TC4复合材料表现出0.2％屈服强度为1146.36MPa（伸长率为8.1％），比纯TC4，GPS / TC4和GON高出24.6％，9.22％和5.62％ / TC4复合材料。 GNPS / TC4纳米复合材料显示出比其他两种类型的纳米复合材料的强度和延展性的平衡更好。协同强化机制被鉴定为orowan强化效果，GNP的有效载荷传递能力，以及界面TIC结构的原位形成，可提供最佳的界面微观结构，以实现TIMC的良好机械性能。 （c）2020 elestvier有限公司保留所有权利。

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