Effect of annealing on the structure and hardness of electrodeposited Ni-W alloys

Shinichiro Hayata, Satoshi Oue, Hiroaki Nakano, Takehiro Takahashi

研究成果: ジャーナルへの寄稿記事

6 引用 (Scopus)

抄録

Synopsis : Electrodeposition of Ni-W alloys was conducted from an unagitated sulfate solution containing citric acid at pH 5 and 60 °C under coulostatic (3.44×105-6.22×105 C/m2) and galvanostatic (30-5000 A/m2) conditions. Before annealing, the lattice constant of Ni increased linearly with an increase in the W content up to 40.7 mass% in accordance with Vegard's law, showing the W supersaturated solid solution into Ni. At W contents of < 37.1 mass%, the deposits showed a morphology of field oriented texture, which a preferred orientation of specific plane occurs toward the electric field in deposition, and the edges of platelet crystals were exposed at surface. At W contents of > 40.7 mass% of solid solubility limit, the cross section of deposits showed a layered morphology, while the surface became smooth with small granular crystals. After annealing, Ni4W precipitated in deposits of W contents of 32.6 and 37.1 mass%, while both Ni4W and NiW precipitated entire surface finely in deposits of W contents of 40.7 to 45.3 mass%. Before annealing, the hardness of deposits increased with W content, and the increase was particularly large at W content of 40.7 mass%. The hardness was almost constant regardless of current density at W contents of > 40.7 mass%. The alloy composition to change the hardness of deposits significantly corresponded with that to change the structure of deposits. The hardness of deposits increased at all W contents by annealing, and the degree of increase was particularly large at W contents of > 40.7 mass%.

元の言語英語
ページ(範囲)1391-1397
ページ数7
ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
100
発行部数11
DOI
出版物ステータス出版済み - 1 1 2014

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hardness
Deposits
Hardness
Annealing
annealing
deposits
Citric acid
Electrodeposition
Citric Acid
Sulfates
Lattice constants
citric acid
Solid solutions
Current density
Solubility
electrodeposition
sulfates
solid solutions
Crystals
solubility

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

これを引用

Effect of annealing on the structure and hardness of electrodeposited Ni-W alloys. / Hayata, Shinichiro; Oue, Satoshi; Nakano, Hiroaki; Takahashi, Takehiro.

:: Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan, 巻 100, 番号 11, 01.01.2014, p. 1391-1397.

研究成果: ジャーナルへの寄稿記事

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abstract = "Synopsis : Electrodeposition of Ni-W alloys was conducted from an unagitated sulfate solution containing citric acid at pH 5 and 60 °C under coulostatic (3.44×105-6.22×105 C/m2) and galvanostatic (30-5000 A/m2) conditions. Before annealing, the lattice constant of Ni increased linearly with an increase in the W content up to 40.7 mass{\%} in accordance with Vegard's law, showing the W supersaturated solid solution into Ni. At W contents of < 37.1 mass{\%}, the deposits showed a morphology of field oriented texture, which a preferred orientation of specific plane occurs toward the electric field in deposition, and the edges of platelet crystals were exposed at surface. At W contents of > 40.7 mass{\%} of solid solubility limit, the cross section of deposits showed a layered morphology, while the surface became smooth with small granular crystals. After annealing, Ni4W precipitated in deposits of W contents of 32.6 and 37.1 mass{\%}, while both Ni4W and NiW precipitated entire surface finely in deposits of W contents of 40.7 to 45.3 mass{\%}. Before annealing, the hardness of deposits increased with W content, and the increase was particularly large at W content of 40.7 mass{\%}. The hardness was almost constant regardless of current density at W contents of > 40.7 mass{\%}. The alloy composition to change the hardness of deposits significantly corresponded with that to change the structure of deposits. The hardness of deposits increased at all W contents by annealing, and the degree of increase was particularly large at W contents of > 40.7 mass{\%}.",
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AB - Synopsis : Electrodeposition of Ni-W alloys was conducted from an unagitated sulfate solution containing citric acid at pH 5 and 60 °C under coulostatic (3.44×105-6.22×105 C/m2) and galvanostatic (30-5000 A/m2) conditions. Before annealing, the lattice constant of Ni increased linearly with an increase in the W content up to 40.7 mass% in accordance with Vegard's law, showing the W supersaturated solid solution into Ni. At W contents of < 37.1 mass%, the deposits showed a morphology of field oriented texture, which a preferred orientation of specific plane occurs toward the electric field in deposition, and the edges of platelet crystals were exposed at surface. At W contents of > 40.7 mass% of solid solubility limit, the cross section of deposits showed a layered morphology, while the surface became smooth with small granular crystals. After annealing, Ni4W precipitated in deposits of W contents of 32.6 and 37.1 mass%, while both Ni4W and NiW precipitated entire surface finely in deposits of W contents of 40.7 to 45.3 mass%. Before annealing, the hardness of deposits increased with W content, and the increase was particularly large at W content of 40.7 mass%. The hardness was almost constant regardless of current density at W contents of > 40.7 mass%. The alloy composition to change the hardness of deposits significantly corresponded with that to change the structure of deposits. The hardness of deposits increased at all W contents by annealing, and the degree of increase was particularly large at W contents of > 40.7 mass%.

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