Metals and Materials International

, Volume 23, Issue 5, pp 877–883 | Cite as

Effect of Ti content on creep properties of Ni-base single crystal superalloys

  • Baig Gyu Choi
  • In Soo Kim
  • Hyun Uk Hong
  • Jeonghyeon Do
  • Joong Eun Jung
  • Chang Yong Jo


The effect of Ti content on the creep properties and microstructures of experimental Ni-base single crystal superalloys has been investigated. The experimental alloys were designed to provide better high temperature properties than the commercial single crystal alloy CMSX-4. The creep properties of the experimental alloys, Alloy 2 and Alloy 3, were superior to those of CMSX-4. Alloy 3 showed a longer creep life than Alloy 2 at 900 °C and 950 °C, while it has similar creep life with Alloy 2 at 982 °C. Transmission electron microscopy micrographs of the experimental alloys after the creep test showed distinct deformation features as a function of temperature and Ti content. The dissociation of dislocations into partial dislocations with stacking faults in Alloy 3 was found to improve resistance to creep deformation at 950 °C. The effect of Ti on the creep deformation mechanism was not evident at 982 °C, which resulted in similar creep properties in both experimental alloys. The transition of the γ′ cutting mechanism from dislocations coupled with stacking faults to anti-phase boundary coupled pairs occurred both in Alloy 2 and Alloy 3. However, the transition temperature was higher in Alloy 3 than in Alloy 2 because of the difference in Ti contents.


alloys Ni-based superalloy casting creep transmission electron microscopy (TEM) 


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Copyright information

© The Korean Institute of Metals and Materials and Springer Science+Business Media B.V. 2017

Authors and Affiliations

  • Baig Gyu Choi
    • 1
  • In Soo Kim
    • 1
  • Hyun Uk Hong
    • 2
  • Jeonghyeon Do
    • 1
  • Joong Eun Jung
    • 1
  • Chang Yong Jo
    • 1
  1. 1.High Temperature Materials DepartmentKorea Institute of Materials ScienceChangwonRepublic of Korea
  2. 2.Department of Materials Science and EngineeringChangwon National UniversityChangwonRepublic of Korea

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