Thermal stability of electrodeposited nanocrystalline nickel assisted by flexible friction
| Autor: | Wang Xiaohe, Zhen-feng Hu, Biao Lü, Bin-shi Xu |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Annealing (metallurgy) Metallurgy Metals and Alloys chemistry.chemical_element engineering.material Abnormal grain growth Geotechnical Engineering and Engineering Geology Condensed Matter Physics Nanocrystalline material Grain size Grain growth Nickel Differential scanning calorimetry Coating chemistry Materials Chemistry engineering Composite material |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 25:3297-3304 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(15)63967-x |
| Popis: | Nanocrystalline nickel coating was prepared by flexible friction assisted electrodeposition technology in an additive-free Watts bath. The coating consists of massive equiaxial crystals with an average grain size of about 24 nm and exhibits a (111) preferred orientation. The differential scanning calorimetry (DSC) analysis of nanocrystalline nickel demonstrates that the peak temperature of rapid grain growth is about 285.4 °C, and the peak temperature of grain growth towards equilibrium is around 431.5 °C. The isochronous annealing results reveal that abnormal grain growth behavior is not observed in nanocrystalline nickel without sulfur-containing. The thermal stability of the deposition was improved due to its initial microstructure of the as-deposited nickel and a certain amount of annealing nano-twins with low-energy, which reduces the driving force for grain growth. Consequently, the coating shows a low residual tensile stress of about 50 MPa and a high microhardness of HV 400 at the annealing temperature of 450 °C. |
| Databáze: | OpenAIRE |
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