Growth twins of R phase in the high Mo-containing nickel-base single crystal superalloy

Shiyu Ma, Jianxin Zhang, Pan Li, Youjian Zhang, Huixin Jin, Wenyang Zhang, Xueqiao Li, Shengcheng Mao, Jide Liu, Xinguang Wang, Yizhou Zhou, Xiaofeng Sun, Wei Ni

Research output: Contribution to journalArticlepeer-review


The topological close packing phases in nickel-base single crystal superalloy aged at 1100 °C for 1000 h was investigated by the spherical aberration-corrected transmission electron microscope. There are R phases precipitated in the matrix, with the hexagonal lattice parameter as a = b = 11.154 Å, c = 17.782 Å. There are lamellar contrasts at the tip of the R phase, which were recognized to be {1-10-1} 01-1-1 type growth twins. The HRTEM results confirm that the formation of growth twins in R phase can release misfit stress to coordinate the distorted relationship between the R phase and the matrix.

Original languageEnglish
Article number126517
JournalMaterials Research Express
Issue number12
Publication statusPublished - 2018 Dec
Externally publishedYes


  • R phase
  • growth twins
  • microstructure
  • nickel-base single crystal superalloys

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Metals and Alloys


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