China Foundry

, Volume 16, Issue 1, pp 14–22 | Cite as

Evolution of interfacial dislocation networks during long term thermal aging in Ni-based single crystal superalloy DD5

  • Qiang Gao
  • Li-rong LiuEmail author
  • Xiao-hua Tang
  • Zhi-jiang Peng
  • Ming-jun Zhang
  • Su-gui Tian
Research & Development


Interfacial dislocations found in single crystal superalloys after long term thermal aging have an important effect on mechanical properties. Long term thermal aging tests for DD5 single crystal superalloy were carried out at 1,100 °C for 20, 100, 200, 500 and 1000 h, and then cooled by air. The effect of long term thermal aging on the dislocation networks at the γ/γ' interfaces was investigated by FE-SEM. Results showed that during the long term thermal aging at 1,100 °C, misfit dislocations formed firstly and then reorientation in the (001) interfacial planes occurred. Different types of square or rectangular dislocation network form by dislocation reaction. Square dislocation networks consisting of four groups of dislocations can transform into octagonal dislocation networks, and then form another square dislocation network by dislocation reaction. Rectangular dislocation networks can also transform into hexagonal dislocation networks. The interfacial dislocation networks promote the γ' phase rafting process. The dislocation networks spacings become smaller and smaller, leading to the effective lattice misfit increasing from −0.10% to −0.32%.

Key words

DD5 single crystal superalloy interfacial dislocations long term thermal aging effective lattice misfit 

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Copyright information

© Foundry Journal Agency and Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Qiang Gao
    • 1
  • Li-rong Liu
    • 1
    Email author
  • Xiao-hua Tang
    • 1
  • Zhi-jiang Peng
    • 2
  • Ming-jun Zhang
    • 2
  • Su-gui Tian
    • 1
  1. 1.School of Materials Science and EngineeringShenyang University of TechnologyShenyangChina
  2. 2.AECC Shenyang Liming Aero Engine Co. Ltd.ShenyangChina

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