Acta Metallurgica Sinica (English Letters)

, Volume 31, Issue 2, pp 113–126 | Cite as

Interpretation of the Habit Plane of δ Precipitates in Superalloy Inconel 718



A calculation method based on a combination of g parallelism rule, good matching site (GMS) analysis, CSL/DSCL (coincidence site lattice/displacement shift complete lattice) and the O-lattice theory has been applied to interpret the observation of the habit plane (HP) of the δ precipitates and the linear defects in the HP in an Inconel 718 superalloy. The small scattering in the HP orientation around an ideal rational plane is interpreted by the existence of a mixture of two types of steps with different heights and inclinations. These steps play a significant role to enhance the degree of matching in the HP. They are associated with secondary dislocations, with Burgers vectors of \(1/6\left[ {1\;1\;\bar{2}} \right]_{\gamma } / 1/3[0\;0\;1]_{\delta }\), and with a direction parallel to a near-invariant line along \([1\;\bar{1}\;0]_{\gamma }\). The spacing of the secondary dislocations projected on the terrace plane is around 6.3 nm. The calculated dislocation structure is in good agreement with the observation.


Good matching site Dislocation Orientation relationship Interfacial structure Coincident site lattice 



This work was financially supported by the National Natural Science Foundation of China (Grant No. 51671111) and the National Key Research and Development Program of China (Grant No. 2016YFB0701304). The authors wish to express thanks to Mr. Zhipeng Sun and Jinyu Zhang for their helpful discussions.


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Copyright information

© The Chinese Society for Metals and Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Key Laboratory of Advanced Materials (MOE), School of Materials Science and EngineeringTsinghua UniversityBeijingChina
  2. 2.Oxford Instruments Beijing OfficeBeijingChina

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