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首页> 外文期刊>Materials Science and Engineering >Enhancement of the mechanical properties of graphene nanoplatelet (GNP) reinforced nickel matrix nanocomposites
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Enhancement of the mechanical properties of graphene nanoplatelet (GNP) reinforced nickel matrix nanocomposites

机译：石墨烯纳米克服料（GNP）增强镍基纳米复合材料的力学性能提高

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摘要

The graphene nanoplatelet (GNP) reinforced nickel matrix composites (Ni-GNP) have been processed using two different ball milling approaches, viz, dry ball milling (DM) and solution ball milling (SBM), followed by consolidation using spark plasma sintering (SPS) technique. The composites were reinforced with varying GNP concentration (0.5-2 wt%) and were milled for up to 12 hr to investigate the effect of premixing technique, milling duration, and GNP concentration on the grain size, microstructure, the dispersion of GNP in the nickel matrix, and mechanical behavior of these composites. Ni-GNP nanocomposites exhibited improved microhard-ness and tensile strength compared to pure nickel, primarily attributed to grain refinement and load transfer strengthening due to the uniform dispersion of these GNPs within the nickel matrix, promoting effective load transfer during tensile deformation. Ni-0.5GNP composites processed via dry milling followed by SPS exhibited the highest tensile yield strength of 586 MPa as compared to pure nickel and other Ni-GNP composites. The contribution of each strengthening mechanism in the overall improvement in yield strength of Ni-GNP composites has been qualitatively calculated/quantified and compared with experimentally obtained tensile properties.
机译：使用两种不同的球磨方法，Viz，干球铣削（DM）和溶液球磨（SBM）处理石墨烯纳米薄镍基复合材料（Ni-GNP），然后使用火花等离子体烧结固结（SPS ）技术。用不同的GNP浓度（0.5-2重量％）加强复合材料，并研磨高达12小时，以研究预混合技术，铣削持续时间和GNP浓度对晶粒尺寸，微观结构，GNP分散的影响镍基质和这些复合材料的机械行为。与纯镍相比，Ni-GNP纳米复合材料表现出改善的微牙髓和拉伸强度，主要归因于由于这些GNP在镍基质中的均匀分散而导致的晶粒细化和负载转移，促进拉伸变形期间的有效负载转移。通过干铣削处理的Ni-0.5GNP复合材料，然后是SPS的抗拉屈服强度为586MPa，与纯镍和其他Ni-GNP复合材料相比。每种强化机制在Ni-GNP复合材料的总屈服强度的总体改善中的贡献已经定性计算/定量，并与实验获得的拉伸性能进行比较。

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