Indentation creep behavior of Fe-based amorphous coatings fabricated by high velocity Oxy-fuel

Li, Chunyan; Ding, Juanqiang; Zhu, Fuping; Yin, Junjun; Wang, Zheng; Zhao, Yuhong; Kou, Shengzhong

doi:10.1016/j.jnoncrysol.2018.09.018

Cited by 27 publications

(10 citation statements)

References 13 publications

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“…It is generally considered that with an increasing indentation load, the STZ or “free volume” will continue to increase, the power to resist creep deformation will reduce, and the creep strain rate sensitivity will increase. 44 , 66 …”

Section: Results and Discussionmentioning

confidence: 99%

“…It is generally considered that with an increasing indentation load, the STZ or "free volume" will continue to increase, the power to resist creep deformation will reduce, and the creep strain rate sensitivity will increase. 44,66 In contrast to the slight increase of m with the increasing load, its value fell from 0.124 to 0.040 with the increasing loading strain rate (Table 2). The generally small variation in m suggests only a weak negative dependence on the loading strain rate (Figure 14b), which is consistent with the variation of C IT (Figure 11d).…”

Section: Creep Behaviors With Respect To Loading Strainmentioning

confidence: 90%

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Using Nanoindentation to Characterize the Mechanical and Creep Properties of Shale: Load and Loading Strain Rate Effects

et al. 2022

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The mechanical and creep properties of shale strongly influence artificial hydraulic fracturing, wellbore stability, and the evaluation of reservoir performance in shale gas exploration. This study characterized these mechanical and creep properties at the microscale through nanoindentation tests and evaluated their dependence on the indentation test parameters, specifically, the indentation load and the loading strain rate. The mechanical parameters (the Young’s modulus and hardness) of shale were strongly influenced by the magnitude of an indentation load (2–400 mN). Both parameters decreased sharply as the load increased from 2 to 200 mN; they then remained relatively stable at loads of 200–400 mN, suggesting that large indentation loads (200–400 mN) can be used to detect the mechanical responses of bulk shale. In contrast, both parameters increased slightly as the loading strain rate increased from 0.005 to 0.1 s –1 . The indentation creep ( C IT ), related to creep behavior, and the creep strain rate sensitivity ( m ), related to the creep mechanism of shale, both increased with increasing the indentation load, whereas they decreased with increasing the loading strain rate. This demonstrates that increasing the load or decreasing the loading strain rate can increase creep deformation in shale during nanoindentation creep testing. The values of m varied from 0.040 to 0.124 under different loading conditions, suggesting that dislocation power-law creep may be the main mechanism controlling creep in shale. This study standardizes the testing parameters for the characterization of the mechanical properties of shale by nanoindentation testing and also advances our understanding of the deformation mechanisms of shale at the microscale.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Creep Behaviors With Respect To Loading Strainmentioning

confidence: 90%

Using Nanoindentation to Characterize the Mechanical and Creep Properties of Shale: Load and Loading Strain Rate Effects

et al. 2022

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“…As a completely elastic-perfectly plastic solid material, Fe-based amorphous coating follows the plastic volume conserving characteristic, and so the indentation was deeper [ 29 , 30 ], while the interface area with shallow indentation obviously had a smaller plastic deformation due to the hardness and brittleness of the intermetallic compound. Intermetallic compounds exhibit higher hardness, higher elastic moduli and lower Poisson ratios than amorphous plastic structures [ 31 ], so the indentation in Figure 4 c was smaller both in depth and springback depth.…”

Section: Discussionmentioning

confidence: 99%

Reinforcing Mechanism of WC Particles in Fe-Based Amorphous Matrix Coating on Magnesium Alloy Surface

Zhang

Wang

et al. 2021

Materials

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To protect magnesium alloy surfaces from wear and corrosion, an Fe-based amorphous coating was prepared on WE43 through the Ni60 interlayer by high-velocity oxygen-fuel (HVOF) spraying. The porosity was ~1%, and the amorphous content exceeded 90%. The wear and corrosion resistance of the composite coating with WC particles wrapped in a Ni layer as the reinforcing phase were compared with that of the completely amorphous coating. The friction coefficient (COF) of the composite coating was 0.3, which is only half of that of the WE43 substrate, and the composite coating exhibited a more stable wear behavior than the completely amorphous coating. The corrosion tendency of the composite coating is lower than that of stainless steel, with a corrosion potential of −0.331 V, and the addition of WC particles did not deteriorate the corrosion resistance considerably. The bonding mechanism of the bonding interface between the amorphous structure and the particles of the reinforcing phase was investigated by transmission electron microscopy (TEM). Reinforcing particles were confirmed to form metallurgical bonding with the coating. It was found that the Ni layer showed excellent bonding performance in the form of a mixture that is amorphous and nanocrystalline. Therefore, the Fe-based amorphous composite coating on a magnesium alloy surface shows a potential protective effect.

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“…The strain rate sensitivity is an important parameter for the creep behavior of nanostructured 8YSZ coatings. The equation describing the steady state creep can be given as follows [29,30]:…”

Section: Methodsmentioning

confidence: 99%

Depth-Sensing Indentation Creep Behavior of Nanostructured Thermal Barrier Coatings from As-Synthesized t’-8YSZ Feedstocks

et al. 2019

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Nano-indentation is a popular method to characterize the micromechanical properties of nanostructured 8YSZ coatings. However, little research has focused on the creep behavior of nano-indentation and only the elastic modulus and nanohardness have been analyzed. Herein, for the first time, the nano-indentation creep behavior of plasma-sprayed nanostructured 8YSZ coatings using as-prepared nanostructured non-transformable tetragonal (t') feedstocks was investigated. The indentation creep behavior can be well characterized by the power-law equation and the strain rate sensitivity has been calculated in light of the equation. The strain rate sensitivity was sensitive to the load and the reasons were analyzed in detail. The current results can further guide and design thermal barrier coatings from the point of indentation creep property.Mechanical properties, embodying elastic modulus, hardness, fracture toughness and bonding strength, are extremely essential to ensure coatings with functionality, reliability, and durability during service [17,[20][21][22]. In addition to tensile testing for bonding strength, nano-indentation is also required and useful for most measurements or calculation of these mechanical properties. Nano-indentation tests in references have mostly focused on the modulus of elasticity, nano-hardness, and calculation of the fracture toughness of coatings [23][24][25]. However, these references pay little attention to the creep behavior of nanostructured 8YSZ coatings. Concerning nanostructured 8YSZ thermal barrier coatings, the stress state and distribution have influences on the properties of coatings [1,6]. It has been reported that the creep property of 8YSZ coatings can determine the stress distribution [26]. Therefore, it is of great importance to study the creep property of nanostructured 8YSZ coatings.Our previous work prepared and investigated high-performance non-transformable tetragonal (t') 8YSZ feedstocks with nanostructure [27]. In this paper, we fabricated high-performance nanostructured 8YSZ coatings from t' feedstocks using the APS method. The creep behavior of nanostructured 8YSZ coatings was studied by nano-indentation for the purpose of filling in this research gap.

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Indentation creep behavior of Fe-based amorphous coatings fabricated by high velocity Oxy-fuel

Cited by 27 publications

References 13 publications

Using Nanoindentation to Characterize the Mechanical and Creep Properties of Shale: Load and Loading Strain Rate Effects

Using Nanoindentation to Characterize the Mechanical and Creep Properties of Shale: Load and Loading Strain Rate Effects

Reinforcing Mechanism of WC Particles in Fe-Based Amorphous Matrix Coating on Magnesium Alloy Surface

Depth-Sensing Indentation Creep Behavior of Nanostructured Thermal Barrier Coatings from As-Synthesized t’-8YSZ Feedstocks

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