Fatigue behavior of A5052 aluminum alloy with diamond-like carbon/electroless nickel plating hybrid coating

Uematsu, Yoshihiko; Kakiuchi, Toshifumi; Adachi, Megumi

doi:10.1299/mel.18-00213

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…In the present study, electroless nickel (Ni) plating on Mg substrate 18) was selected as an interlayer 19) , because Ni plating is one of the simplest coating procedures and the fabrication cost is much cheaper than thermal spraying. In addition, it is known that Mg alloys have lower corrosion resistance than Al alloys, and the effect of coating on corrosion fatigue properties 20), 21) is interesting issue in terms of mechanical reliability.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behavior of Magnesium Alloy with Diamond-Like Carbon/Nickel Plating Hybrid Coating in Laboratory Air and Corrosive Environment

Uematsu

Kakiuchi

Adachi

et al. 2019

J. Soc. Mat. Sci., Japan

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Fatigue tests using magnesium alloy, AZ80A, were conducted in laboratory air and demineralized water to investigate the effect of diamond-like carbon (DLC)/electroless nickel (Ni) plating hybrid coating on the fatigue performances. The fatigue strengths of Ni plating single-layered specimens were lower than those of the substrate, while DLC single layer could improve fatigue strengths. DLC/Ni plating hybrid coating could further improve fatigue strengths than DLC single layer. The cyclic slip deformation inducing fatigue crack initiation was effectively suppressed by DLC/Ni plating hybrid coating. Fatigue tests in demineralized water revealed that the fatigue strengths decreased irrespective of coatings. DLC/Ni plating hybrid coating had little effect on the fatigue strengths in corrosive environment. Demineralized water could reach substrate through some defects in the coatings, resulting in the degradation of fatigue strengths in demineralized water.

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Section: Introductionmentioning

confidence: 99%

Fatigue Behavior of Magnesium Alloy with Diamond-Like Carbon/Nickel Plating Hybrid Coating in Laboratory Air and Corrosive Environment

Uematsu

Kakiuchi

Adachi

et al. 2019

J. Soc. Mat. Sci., Japan

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サブミクロン銅薄膜の疲労き裂進展特性に及ぼす表面酸化層の影響

KONDO,

MORIKUNI,

DATE

et al. 2024

Transactions of the JSME (In Japanese)

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Fatigue failure involves fatigue crack initiation and propagation processes. In bulk metals, the fatigue crack initiation process is strongly affected by a dissimilar surface layer, while the fatigue crack propagation process is less affected. In the case of the metallic thin films, which are a kind of small-scale metallic materials, have a large surface-area-to-volume ratio, and the fatigue crack propagation process is dominated by the formation of out-of-plane surface fatigue damage, intrusion/extrusion, which is observed in fatigue crack initiation process in bulk metals. Therefore, even a surface layer with a thickness on the order of nanometers would have a significant influence on fatigue crack propagation behavior of metallic thin films. In this study, in situ field emission scanning electron microscope (FESEM) observation experiments of fatigue crack propagation were conducted on freestanding copper thin films with a thickness of 500 nm with a thickness-controlled surface oxide layer in the range of ~0 nm to ~20 nm. The results showed that the fatigue crack propagation properties were influenced by the thickness of the surface oxide layer: acceleration of fatigue crack propagation, transitions of fatigue crack propagation mechanisms (from intrusion/extrusion mode to tensile-dominant mode) and unstable fracture occurred at smaller stress intensity factor range K for the films with a thicker surface oxide layer than that for the films with a thinner surface oxide layer. Moreover, the fatigue crack propagation rate da/dN was smaller in the region near the fatigue crack propagation threshold and thus the threshold stress intensity factor range Kth increased in the films with a thicker surface oxide layer. In situ FESEM observations showed that fatigue damage area around the fatigue crack became narrower in the films with thicker surface oxide layer, and the fatigue crack reached the threshold when intrusions/extrusions were rarely formed ahead of the crack tip. This suggests that the fatigue crack propagation threshold in metallic thin films is determined whether intrusions/extrusions are formed around the fatigue crack.

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Effect of Fabrication Processes on Fatigue Strength and Small Fatigue Crack Growth Behavior of A6061 and Al-Si Eutectic Alloys

UEMATSU

Kakiuchi

Nakagaki

et al. 2022

J. Soc. Mat. Sci., Japan

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Rotating bending fatigue tests were conducted using A6061 and Al-Si eutectic alloys to investigate fatigue strengths and small fatigue crack growth behavior. Both alloys were fabricated by continuous casting and extrusion, and the effect of fabrication processes on the fatigue properties was investigated. The fatigue strengths of continuously-casted and extruded A6061 alloys were nearly comparable. The specimens, which were sampled parallel to the extrusion direction, exhibited higher fatigue crack initiation resistance than the specimens sampled perpendicular to the extrusion direction. However, the fatigue crack growth resistance was higher in the specimens sampled perpendicular to the extrusion direction. The differences in the crack initiation and growth resistances were attributed to the different microstructures depending on the extrusion direction. The fatigue strength of the extruded Al-Si eutectic alloy was higher than that of continuously-casted alloy, which could be attributed to the higher fatigue crack initiation resistance of the extruded alloy. The continuously-casted Al-Si eutectic alloy had typical dendritic microstructure, in which eutectic Si dispersed heterogeneously. The extrusion process homogenized the dispersion of eutectic Si in the microstructure, which resulted in the higher fatigue crack initiation resistance.

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Fatigue behavior of A5052 aluminum alloy with diamond-like carbon/electroless nickel plating hybrid coating

Cited by 3 publications

References 13 publications

Fatigue Behavior of Magnesium Alloy with Diamond-Like Carbon/Nickel Plating Hybrid Coating in Laboratory Air and Corrosive Environment

Fatigue Behavior of Magnesium Alloy with Diamond-Like Carbon/Nickel Plating Hybrid Coating in Laboratory Air and Corrosive Environment

サブミクロン銅薄膜の疲労き裂進展特性に及ぼす表面酸化層の影響

Effect of Fabrication Processes on Fatigue Strength and Small Fatigue Crack Growth Behavior of A6061 and Al-Si Eutectic Alloys

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