Mechanical Properties of Powder Metallurgy Nickel‐Based Superalloy Composite Reinforced by Low Content Graphene Nanosheets,Advanced Engineering Materials

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Mechanical Properties of Powder Metallurgy Nickel‐Based Superalloy Composite Reinforced by Low Content Graphene Nanosheets
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-06-02 , DOI: 10.1002/adem.202000156
Yuxi Gao _{1,

2,

3,

4} , Jinwen Zou _{3,

4} , Xiaofeng Wang _{3,

4} , Jie Yang _{3,

4} , Zhuo Li _{1,

2} , Jia Li _{1,

2} , Xu Cheng _{1,

2} , Haibo Tang _{1,

2}

Affiliation

This study focuses on the effects of adding low content of graphene nanosheets (GNSs) (≤0.3 wt%) on microstructure and tensile property of GNSs‐reinforced nickel‐based superalloy (FGH96). The GNSs‐reinforced FGH96 composite is fabricated by wet‐chemical mixing and hot isostatic pressing. Microstructures and mechanical properties of the composites are studied by scanning electron microscope, transmission electron microscope, and static tensile tests. Results indicate that, when the addition amount of GNSs is less than 0.1 wt%, the tensile properties of the GNSs‐reinforced FGH96 composites improve without losing their plasticity. The largest reduction of area (R/A) ratio of the composite is observed when 0.005 wt% GNSs is added, which is 81.4% higher than the unreinforced alloy. As the cross‐sectional area of tensile sample reduces during necking, the GNSs/unit area increases, leading to the delayed fracture with an increase in R/A ratio and true fracture strength. Theoretical analysis suggests that the strengthening mechanism of GNSs–FGH96 belongs to the modified shear lag model. The interfacial shear stress caused by the presence of GNSs is the main reason for the increase in yield strength.

中文翻译：

低含量石墨烯纳米片增强粉末冶金镍基高温合金复合材料的力学性能

这项研究的重点是添加低含量的石墨烯纳米片（GNSs）（≤0.3 wt％）对GNSs增强的镍基高温合金（FGH96）的组织和拉伸性能的影响。GNSs增强的FGH96复合材料是通过湿化学混合和热等静压制成的。通过扫描电子显微镜，透射电子显微镜和静态拉伸试验研究了复合材料的微观结构和力学性能。结果表明，当GNS的添加量小于0.1 wt％时，GNS增强的FGH96复合材料的拉伸性能得到改善，而不会损失其可塑性。最大减少面积（R / A当添加0.005重量％的GNS时，观察到复合材料的比率，这比未增强的合金高81.4％。随着颈缩过程中拉伸样品的横截面积减小，GNS /单位面积增加，导致延迟断裂，R / A比和真实断裂强度增加。理论分析表明，GNSs–FGH96的强化机制属于修正的剪切滞后模型。由GNS的存在引起的界面剪切应力是屈服强度增加的主要原因。

更新日期：2020-06-02

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