Morphology Evolution of Grain Boundary Carbides Precipitated Near Triple Junctions in Highly Twinned Alloy 690

  • Hui LiEmail author
  • Xirong Liu
  • Kai Zhang
  • Wenqing Liu
  • Shuang Xia
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


The evolution of carbides precipitated on grain boundaries near triple junctions in Inconel Alloy 690 following aging treatments at 715 °C for 2, 15 and 50 h were investigated by SEM and EBSD. The results show that, aging time does not influence the morphology of the carbides precipitated at grain boundaries, however, it does influence the morphology of carbides precipitated at triple junctions. Tiny carbides are precipitated at coherent Σ3 grain boundary, bar like carbides are precipitated at both sides of incoherent Σ3 grain boundary, while on only one side of Σ9 grain boundary, and the morphology of carbides precipitated on Σ27 and random grain boundaries are similar. Therefore, the type of nearby grain boundaries can influence the morphology of carbides precipitated at the other grain boundaries.


Carbide precipitation Grain boundary character Triple junction Grain boundary engineering Alloy 690 



This work was supported by the National Natural Science Foundation of China (Grant No. 51301103) and the National Key Research Project and Development Program of China (Grant No. 2016YFB0700401).


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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Hui Li
    • 1
    Email author
  • Xirong Liu
    • 1
  • Kai Zhang
    • 1
  • Wenqing Liu
    • 1
  • Shuang Xia
    • 1
  1. 1.Key Laboratory for MicrostructuresShanghai UniversityShanghaiPeople’s Republic of China

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