Investigations on the structure and properties of nanocrystalline Ni-Mo alloy coatings

Liu, J.H.; Li, W.H.; Pei, Zhibin; Gong, Jun; Sun, Cheng

doi:10.1016/j.matchar.2020.110532

Cited by 26 publications

(17 citation statements)

References 56 publications

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“…It can be also observed that Ni-Mo-W coatings after annealing lower than 400 • C perform nodules-type morphology as the presence of nanocrystalline phase. This nodules-type structure transforms into cauliflowertype morphology with the temperature increasing to 600 • C. This can be attributed to the more columnar crystals growth of Ni-based solid solutions [27]. Similar to 600 • C annealed Ni-Mo coating, it is obvious that fine and dispersed white particles appear on the surface morphology of both 400 and 600 • C annealed Ni-Mo-W coatings.…”

Section: The Microstructurementioning

confidence: 88%

“…It can be clearly observed that the increment in hardness ranging from 0.8-2.3 GPa are obtained for Ni-Mo-W coating in compared with Ni-Mo coatings at the same annealing temperature. In the case of as-deposited and annealed Ni-Mo-W coatings, three different factors may be associated with the enhancement of hardness, namely, solid solution strengthening and grain refinement, and precipitation strengthening [8,27,28,30,31]. As discussed in the relevant literatures [37,38], refractory metals such as W and Mo additions in Ni-based coatings cause little change in solid solution strengthening.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…While the annealing temperature is lower than the onset temperature of phase separation, the remarkable increments in hardness could be ascribed to grain boundary relaxation with annihilation of excess dislocations at the grain boundary, which are transforming to a more stable configuration without obvious grain growth [27,30,37]. It is worthy to note that the hardness of the coatings shows slight improvements with annealing temperature up to 600 • C. The fact of a lower contribution to the H-P strengthening component in coatings are substantiated due to grain coarsening on annealing [27,31], and the hardness can be compensated by the strengthening effect of the fine Ni 3 Mo or Ni 3 Mo-Ni 4 W precipitates resulting from phase separation. Figure 7b shows the comparison curve of elastic modulus for Ni-Mo and Ni-Mo-W coatings with annealing temperature.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…Considering mechanical properties of Ni-W and Ni-Mo coating, the choice of electrodeposited Ni-Mo-W alloy coatings may impart better or equivalent mechanical performance. Moreover, heat treatment is an important and necessary technology to improve the mechanical performance of Ni-based coatings, such as Ni-Mo and Ni-W [27][28][29][30][31][32]. Recently, Liu et al [27] studied the influences of Mo content and heat treatment on the structure and mechanical properties of Ni-Mo coating, and found that an increment in hardness was derived from the grain boundary (GB) relaxation and the segregation of Mo at GB when the annealing temperature lower than the phase transition temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, heat treatment is an important and necessary technology to improve the mechanical performance of Ni-based coatings, such as Ni-Mo and Ni-W [27][28][29][30][31][32]. Recently, Liu et al [27] studied the influences of Mo content and heat treatment on the structure and mechanical properties of Ni-Mo coating, and found that an increment in hardness was derived from the grain boundary (GB) relaxation and the segregation of Mo at GB when the annealing temperature lower than the phase transition temperature. Wang et al [28] confirmed that nano-sized NiMo precipitates dispersed in the Ni(Mo) solution matrix were responsible for the secondary annealing-induced hardening of Ni-Mo coating while the temperature ranged from 500 to 700 • C. Considering rare references of the structure evolution and strengthening mechanism of annealed ternary Ni-Mo-W coatings prepared by electrodeposition, it is necessary to research the effect of annealing temperature on the microstructure and mechanical properties of these coatings.…”

Section: Introductionmentioning

confidence: 99%

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Investigations on the Influence of Annealing on Microstructure and Mechanical Properties of Electrodeposited Ni-Mo and Ni-Mo-W Alloy Coatings

Zhang

Wang³

et al. 2021

Coatings

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Ni-Mo and Ni-Mo-W coatings were electrodeposited on a stainless steel sheet, and then were annealed at 200, 400, and 600 °C. The effect of annealing heat treatment on the microstructure of Ni-Mo and Ni-Mo-W electrodepositions, their nano-hardness, and tribological properties were investigated. It was revealed that the average crystalline are refined and phase separation are promoted with formation of Mo-W related intermetallic precipitates at temperature exceed 400 °C on account of the co-existence of Mo-W elements within Ni-Mo-W coatings. Annealing heat treatment leads to hardening, and the hardness and elastic module increase significantly. The grain boundary (GB) relaxation and hard precipitated intermetallic particles are responsible for the annealing-induced hardening for ≤400 °C annealed and 600 °C annealed Ni-Mo-W coatings, respectively. In addition, both adhesive wear and abrasive wear are observed for coatings, and abrasive wear becomes predominant when annealing temperature up to 600 °C. The wear resistance of coatings is improved eventually by formation of a mixture of lubricated oxides upon annealing at 600 °C and the enhancement of H/E ratio for ≤400 °C annealed Ni-Mo-W coatings.

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Section: The Microstructurementioning

confidence: 88%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigations on the Influence of Annealing on Microstructure and Mechanical Properties of Electrodeposited Ni-Mo and Ni-Mo-W Alloy Coatings

Zhang

Wang³

et al. 2021

Coatings

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Achieving Diamond‐Like Wear in Ta‐Rich Metallic Glasses

et al. 2023

Advanced Science

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Most metals and alloys suffer from high friction and wear due to their low hardness and lack of self-lubrication. Although plenty of strategies have been proposed, it is still a long-standing challenge to achieve diamond-like wear in metals. Metallic glasses (MGs) are supposed to possess low coefficient of friction (COF) because of their high hardness and fast surface mobility. However, their wear rate is larger than that of diamond-like materials. Here, this work reports the discovery of Ta-rich MGs that exhibit diamond-like wear. This work develops an indentation approach for high-throughput characterization of crack resistance. By employing deep indentation loading, this work is able to efficiently identify the alloys that exhibit better plasticity and crack resistance according to the differences of indent morphology. With high temperature stability, high hardness, improved plasticity, and crack resistance, the discovered Ta-based MGs exhibit diamond-like tribological properties, featured by COF as low as ≈0.05 for diamond ball test and ≈0.15 for steel ball test, and specific wear rate of only ≈10 −7 mm 3 N −1 m −1 . The discovery approach and the discovered MGs exemplifie the promise to substantially reduce friction and wear of metals and may unleash the potential of MGs in tribological applications.

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Effect of limiting current density on corrosion performance of Ni–Mo, Ni–Cd and Ni–Mo–Cd alloy coatings

Shetty

Hegde

2023

Chem. Pap.

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In this article an attempt was made to increase the corrosion resistance of Ni– Mo alloy coatings with the addition of small quantity of CdCl2 into its bath. The limiting of limiting current density (iL) of Ni in both Ni–Mo and Ni–Cd baths due to inherent induced and normal type of codeposition has been successfully alleviated by addition of 1 g/L of CdCl2. The advent of induced and normal type of codeposition of individual binary baths has been used to optimize the Ni content of the ternary deposit for better corrosion stability. The composition vs. current density plots of all coatings have been studied, and thereby optimal iL of Ni in all baths were assessed. The content of Mo was found to be decreased with the small addition of Cd to the bath. Results revealed that (Ni–Mo–Cd)6.0 Adm−2 coating showed better corrosion resistance by reducing iL of Ni, on addition of Cd+2 ions into the bath and was explained in the light of diffusion limited deposition of Ni+2 ions. The results were supported by SEM (scanning electron microscopy), XRD (X-ray diffraction) and AFM (atomic force microscopy) study of Ni–Mo, Ni–Cd and Ni–Mo–Cd coatings at optimal current densities.

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Investigations on the structure and properties of nanocrystalline Ni-Mo alloy coatings

Cited by 26 publications

References 56 publications

Investigations on the Influence of Annealing on Microstructure and Mechanical Properties of Electrodeposited Ni-Mo and Ni-Mo-W Alloy Coatings

Investigations on the Influence of Annealing on Microstructure and Mechanical Properties of Electrodeposited Ni-Mo and Ni-Mo-W Alloy Coatings

Achieving Diamond‐Like Wear in Ta‐Rich Metallic Glasses

Effect of limiting current density on corrosion performance of Ni–Mo, Ni–Cd and Ni–Mo–Cd alloy coatings

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