Microstructure and fracture toughness of electrodeposited Ni-21 at.% W alloy thick films

Yin, Denise; Marvel, Christopher J.; Cui, Fiona Yuwei; Vinci, Richard P.; Harmer, Martin P.

doi:10.1016/j.actamat.2017.10.001

Cited by 35 publications

(13 citation statements)

References 59 publications

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“…The microhardness of Ni-15 wt.% W as-deposited alloy coating at 534 HV was similar to the reported value of 460-740 HV [24]. When the annealed temperature was increased from 200 • C to 300 • C, the microhardness increased slowly and then rapidly reached the maximum of 895 HV at 400 • C. In contrast, the higher published value of Ni-21 at.% W was 1005 HV [25], but this was still higher than the value of 650-800 HV studied by Haj-Taieb et al [26]. This difference is mainly caused by the difference in W content.…”

Section: Microhardness Of Ni-15 Wt% W Alloysupporting

confidence: 84%

Excellent Properties of Ni-15 wt.% W Alloy Electrodeposited from a Low-Temperature Pyrophosphate System

Liu

et al. 2021

Coatings

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Electrodeposited Ni-W alloy coatings are considered to be one of the most suitable candidate coatings to replace carcinogenic hexavalent chromium coatings. In this work, Ni-W alloys are electrodeposited from pyrophosphate baths containing different concentrations of Na2WO4 2H2O (CW) at 40 °C. Both CW and the applied current density can affect the W content in the coatings. The effect of CW becomes weaker with the increased current density. The Ni-W alloys with 15 ± 5 wt.% W (Ni-15 wt.% W) are obtained from the bath containing 40 g L−1 CW at a high current of 8 A dm−2. The microhardness, corrosion resistance and hydrogen evolution reaction (HER) are measured with a microhardness tester and an electrochemical workstation. The modified properties are studied by heat treatment from 200 to 700 °C. The highest microhardness of 895.62 HV and the better HER property is presented after heat treatment at 400 °C, while the best corrosion resistance in 3.5 wt.% NaCl solution appears at 600 °C.

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Section: Microhardness Of Ni-15 Wt% W Alloysupporting

confidence: 84%

Excellent Properties of Ni-15 wt.% W Alloy Electrodeposited from a Low-Temperature Pyrophosphate System

Liu

et al. 2021

Coatings

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“…The technique was further developed for testing of materials showing non-negligible plastic deformation by Wurster et al [34]. In further studies on NiAl [35][36][37], W [38,39] and NiW films [40] fracture toughness determination of materials in the semi-brittle regime was elaborated. In this manner, environmental effects on the local mechanical behaviour could also be studied in detail [41][42][43][44].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

The brittle-ductile transition of tungsten single crystals at the micro-scale

et al. 2018

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The loading rate effect on the brittle-ductile transition temperatures of tungsten single crystals at the micro-scale was investigated by microcantilevers with a (100)[001] crack system. Specimens with a length to width to height of 15 µm / 4 µm / 6 µm were fabricated by focused ion beam milling. At low temperatures (-90 to -25 °C) the samples failed by brittle cleavage fracture, irrespective of the applied loading rate at a fracture toughness of 3.2 MPa•m 1/2 . With increasing temperatures up to 500 °C and depending on the applied loading rate, the fracture toughness increased and significant crack tip plasticity and dislocation-controlled microcleavage were observed by means of high resolution electron backscatter diffraction measurements performed after testing. With respect to macroscopic specimens, a shift of the brittle-ductile transition to lower temperatures and a significantly lower activation energy of the brittle-ductile transition of 0.36 eV were found. We explain this by the increase in flow stresses due to sample size effects.

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“…Hence, the measurement of sample size-independent fracture toughness values for micro-ductile materials using micro-sized specimens is limited to a small class of materials, see e.g. [72][73][74]. For most micro-ductile materials, fracture mechanics tests on micro-sized samples will result in a size dependence of the fracture resistance [75], as some or all requirements on a, B, and W-a are not fulfilled.…”

Section: Micro Ductile Crack Propagationmentioning

confidence: 99%

Fracture mechanics of micro samples: Fundamental considerations

2018

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• Fundamental concepts of fracture mechanics are revisited with respect to their applicability in miniaturized experiments • Stress state and notch sharpness in miniaturized samples need to be considered • For size independent fracture toughness values, sample sizes must obey relations to the microstructure and fracture process zone • Different contributions to material toughness can be separated by appropriate experimental design

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Microstructure and fracture toughness of electrodeposited Ni-21 at.% W alloy thick films

Cited by 35 publications

References 59 publications

Excellent Properties of Ni-15 wt.% W Alloy Electrodeposited from a Low-Temperature Pyrophosphate System

Excellent Properties of Ni-15 wt.% W Alloy Electrodeposited from a Low-Temperature Pyrophosphate System

The brittle-ductile transition of tungsten single crystals at the micro-scale

Fracture mechanics of micro samples: Fundamental considerations

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