Ductility enhancement in Co-Fe-Ni alloys by microstructural control

M. Matsuda, K. Yamashita, S. Tsurekawa, K. Takashima, Minoru Nishida

研究成果: ジャーナルへの寄稿記事

1 引用 (Scopus)

抄録

We investigated the relationship between the microstructure and mechanical properties of ternary Co-Fe-Ni alloys. The solution-treated Co 50Fe40Ni10 alloy was composed of only the α′-phase having a B2 structure with a low degree of order, whereas the Co50Fe40Ni10 alloy annealed at 873 K consisted of a dual phase, i.e., an α′-matrix and a γ-phase with a face-centered cubic structure that primarily covered the grain boundaries of the α′-matrix and precipitated finely in the grain interior. The orientation relationship between the α′-matrix and the γ-phase is determined to be (11̄0)α′//(11̄1̄) γand [001]α′//[01̄1]γ, i.e., N-W relationship. The volume fraction of the γ-phase was estimated to be about 26%. Substituting Ni at 10 at% increased the yield, tensile strength, and total elongation. It is noteworthy that the Co50Fe40Ni10 alloy annealed at 873 K had a high tensile strength of 1005 MPa and high total elongation of over 12%. The origin of the dramatic improvement in the ductility is attributed to the considerably ductile γ-phase, which suppresses intergranular and cleavage fracture. High strengthening is also originated from both the solid-solution strengthening of Ni and the grain refinement of the α′-matrix.

元の言語英語
ページ(範囲)124-130
ページ数7
ジャーナルIntermetallics
52
DOI
出版物ステータス出版済み - 1 1 2014

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Ductility
Elongation
Tensile strength
Grain refinement
Solid solutions
Volume fraction
Grain boundaries
Mechanical properties
Microstructure

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys
  • Chemistry(all)

これを引用

Ductility enhancement in Co-Fe-Ni alloys by microstructural control. / Matsuda, M.; Yamashita, K.; Tsurekawa, S.; Takashima, K.; Nishida, Minoru.

:: Intermetallics, 巻 52, 01.01.2014, p. 124-130.

研究成果: ジャーナルへの寄稿記事

Matsuda, M. ; Yamashita, K. ; Tsurekawa, S. ; Takashima, K. ; Nishida, Minoru. / Ductility enhancement in Co-Fe-Ni alloys by microstructural control. :: Intermetallics. 2014 ; 巻 52. pp. 124-130.
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abstract = "We investigated the relationship between the microstructure and mechanical properties of ternary Co-Fe-Ni alloys. The solution-treated Co 50Fe40Ni10 alloy was composed of only the α′-phase having a B2 structure with a low degree of order, whereas the Co50Fe40Ni10 alloy annealed at 873 K consisted of a dual phase, i.e., an α′-matrix and a γ-phase with a face-centered cubic structure that primarily covered the grain boundaries of the α′-matrix and precipitated finely in the grain interior. The orientation relationship between the α′-matrix and the γ-phase is determined to be (11̄0)α′//(11̄1̄) γand [001]α′//[01̄1]γ, i.e., N-W relationship. The volume fraction of the γ-phase was estimated to be about 26{\%}. Substituting Ni at 10 at{\%} increased the yield, tensile strength, and total elongation. It is noteworthy that the Co50Fe40Ni10 alloy annealed at 873 K had a high tensile strength of 1005 MPa and high total elongation of over 12{\%}. The origin of the dramatic improvement in the ductility is attributed to the considerably ductile γ-phase, which suppresses intergranular and cleavage fracture. High strengthening is also originated from both the solid-solution strengthening of Ni and the grain refinement of the α′-matrix.",
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