Open AccessNi/Ni3Al interface-dominated nanoindentation deformation and pop-in events
Author(s) -
Jinghai Zhou,
Yingle He,
Jinchuan Shen,
F.A. Essa,
Jingui Yu
Publication year - 2021
Publication title -
nanotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.926
H-Index - 203
eISSN - 1361-6528
pISSN - 0957-4484
DOI - 10.1088/1361-6528/ac3d62
Subject(s) - materials science , nanoindentation , stacking fault energy , indentation , phase (matter) , dislocation , composite material , slip (aerodynamics) , elastic energy , deformation (meteorology) , crystallography , thermodynamics , organic chemistry , chemistry , physics
Nickel-based single crystal alloys have excellent mechanical properties due to its unique two-phase structure and interface. Therefore, molecular dynamics methods were used to simulate nanoindentation and microstructural evolution. We found the indenter reaction force and hardness of the Ni 3 Al phase is the largest. The pop-in event in Ni 3 Al phase is more obvious than that in the Ni phase and Ni/Ni 3 Al phase. Because lots of dislocations in the Ni 3 Al phase break through the barrier of the interface and cut into the Ni phase, while dislocations in the Ni phase only slip inside the Ni phase. Moreover, we found that the position of the starting point of the adhesion force recovery is mainly related to the elastic recovery of the material. The stronger the elastic recovery of the phase, the smaller the depth value corresponding to the starting point of the recovery. We further studied the variation of potential energy with indentation depth and found that the change of wave trough of the load–displacement ( P – h ) curve is related to stacking fault energy. This study has important theoretical guiding significance for the in-depth understanding and engineering application of the mechanical properties of nickel-based single crystal alloys.