Elastic instability condition of the raft structure during creep deformation in nickel-base superalloys

K. Tanaka, T. Ichitsubo, K. Kishida, H. Inui, E. Matsubara

研究成果: Article

9 引用 (Scopus)

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A condition for destabilizing the raft structure has been deduced from elastic energy calculations with the concept of "effective eigenstrain", where the effect of creep deformation is included in addition to the lattice mismatch. The calculations indicate that the 0 0 1 raft structure is stabilized by a small amount of creep deformation but becomes unstable when the creep strain in the γ phase exceeds the magnitude required to fully relax the lattice mismatch. The excess creep strain is required to produce an internal elastic field that suppresses further creep deformation, and has to be introduced in the primary creep stage. Via the instability of the 0 0 1 raft structure, the raft structure gradually turns into a wavy one in the second creep stage before its collapse.

元の言語English
ページ(範囲)3786-3790
ページ数5
ジャーナルActa Materialia
56
発行部数15
DOI
出版物ステータスPublished - 2008 9 1
外部発表Yes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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