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Ni-based single crystal line alloy is constituted with γ phase and γ' phase in the form of coherency. Since an indenter for two-phase coherent structure is bigger than the usual nano-scale indenter, the press location of indenter may be unclear in nanoindentation simulation. Both γ phase and γ' phase may be pressed initially, and the mechanical properties shown are different because of the initial press locations. The nanoindentation of Ni-based single crystal line alloys is simulated by molecular dynamics method. Two models are used to study about the hardness in [001] crystal orientation, one is the model γ /γ' with the initial indentation on γ phase, and the other is the model γ'/γ with the initial indentation on γ' phase. The influence of misfit dislocation at (001) interface on nanoindentation of the two models is analyzed using a center-symmetry parameter. Results show that the misfit dislocation shape of the two models are different after relaxation. Lomer-Cottrell dislocation occurs on (001) interface in the γ'/γ model. Before 0.930 nm press depth is reached, there is little change in the (001) interface misfit dislocation of the two models. Relationship between press load and press depth is similar for the two models, and it is the same in the relationship between hardness and press depth. After press depth reaches 0.930 nm, the misfit dislocation at (001) interface for model γ'/γ grows big, which results in a smaller press load and a smaller hardness computation in the model γ'/γ than that in model γ /γ'. When the press depth reach 2.055 nm, we find only a small amount of dislocations in γ phase that can go into γ' phase since the misfit dislocation at (001) interface in model γ /γ' hinders the process. However, none of dislocations can go into γ phase because of the prevention caused by Lomer-Cottrell dislocation at the (001) interface in the model γ'/γ . That means the Lomer-Cottrell dislocation reinforces the material obviously. So the press load in model γ'/γ grows faster than that in model γ /γ'.
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Keywords:
- nanoindentation /
- molecular dynamics /
- misfit dislocation
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[2] Probst-Hein M, Dlouhy A, Eggeler G 1999 Acta Mater. 47 2497
[3] Hu Z Q, Peng P, Liu Y, Jin T, Sun X F, Guan H R 2002 Acta Metall. Sin. 38 1121 (in Chinese) [胡壮麒, 彭平, 刘轶, 金涛, 孙晓峰, 管恒荣 2002 金属学报 38 1121]
[4] Zhang J X, Murakumo T, Koizumi Y, Harada H, Masaki J S 2002 Metall. Mater. Trans. A 33 3741
[5] Gabb T P, Draper S L, Hull D R, Mackay R A, Nathal M V 1989 Mater. Sci. Eng. A 118 59
[6] Pollock T M, Argon A S 1994 Acta Metall. Mater. 42 1859
[7] Wu W P, Guo Y F, Wang Y S, Xu S 2011 Acta Phys. Sin. 60 056802 (in Chinese) [吴文平, 郭雅芳, 汪越胜, 徐爽 2011 60 056802]
[8] Xie H X, Yu T, Liu B 2011 Acta Phys. Sin. 60 046104 (in Chinese) [谢红献, 于涛, 刘波 2011 60 046104]
[9] Zeng F L, Sun Y 2006 Chinese J. Solid Mech. 27 341 (in Chinese) [曾凡林, 孙毅 2006 固体力学学报 27 341]
[10] Sawant A, Tin S 2007 Scripta Mater. 58 275
[11] Gao Y, Wen S P, Wang X H, Pan F 2006 J. Aeronaut. Mater. 26 148 (in Chinese) [高阳, 文胜平, 王晓慧, 潘峰 2006 航空材料学报 26 148]
[12] Zhang P, Li S X, Zhang Z F 2011 Mater. Sci. Eng. A 529 62
[13] Caceres C H, Griffiths J R, Pakdel A R, Davidson C J 2005 Mater. Sci. Eng. A 402 258
[14] Hu X J, Zheng B L, Hu T Y, Yang B, He P F, Yue Z F 2014 Acta Phys. Sin. 63 176201 (in Chinese) [胡兴健, 郑百林, 胡腾越, 杨彪, 贺鹏飞, 岳珠峰 2014 63 176201]
[15] Fang T H, Chang W Y, Huang J J 2009 Acta Mater. 57 3341
[16] Hoffmann K H, Schreiber M 1996 Computational Physics (Berlin Heidelberg: Springer-Verlag) p268
[17] Imran M, Hussain F, Rashid M, Ahmad S A 2012 Chin. Phys. B 21 116201
[18] Imran M, Hussain F, Rashid M, Ahmad S A 2012 Chin. Phys. B 21 126802
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[1] Erickson G L 1995 J. of Metals 47 36
[2] Probst-Hein M, Dlouhy A, Eggeler G 1999 Acta Mater. 47 2497
[3] Hu Z Q, Peng P, Liu Y, Jin T, Sun X F, Guan H R 2002 Acta Metall. Sin. 38 1121 (in Chinese) [胡壮麒, 彭平, 刘轶, 金涛, 孙晓峰, 管恒荣 2002 金属学报 38 1121]
[4] Zhang J X, Murakumo T, Koizumi Y, Harada H, Masaki J S 2002 Metall. Mater. Trans. A 33 3741
[5] Gabb T P, Draper S L, Hull D R, Mackay R A, Nathal M V 1989 Mater. Sci. Eng. A 118 59
[6] Pollock T M, Argon A S 1994 Acta Metall. Mater. 42 1859
[7] Wu W P, Guo Y F, Wang Y S, Xu S 2011 Acta Phys. Sin. 60 056802 (in Chinese) [吴文平, 郭雅芳, 汪越胜, 徐爽 2011 60 056802]
[8] Xie H X, Yu T, Liu B 2011 Acta Phys. Sin. 60 046104 (in Chinese) [谢红献, 于涛, 刘波 2011 60 046104]
[9] Zeng F L, Sun Y 2006 Chinese J. Solid Mech. 27 341 (in Chinese) [曾凡林, 孙毅 2006 固体力学学报 27 341]
[10] Sawant A, Tin S 2007 Scripta Mater. 58 275
[11] Gao Y, Wen S P, Wang X H, Pan F 2006 J. Aeronaut. Mater. 26 148 (in Chinese) [高阳, 文胜平, 王晓慧, 潘峰 2006 航空材料学报 26 148]
[12] Zhang P, Li S X, Zhang Z F 2011 Mater. Sci. Eng. A 529 62
[13] Caceres C H, Griffiths J R, Pakdel A R, Davidson C J 2005 Mater. Sci. Eng. A 402 258
[14] Hu X J, Zheng B L, Hu T Y, Yang B, He P F, Yue Z F 2014 Acta Phys. Sin. 63 176201 (in Chinese) [胡兴健, 郑百林, 胡腾越, 杨彪, 贺鹏飞, 岳珠峰 2014 63 176201]
[15] Fang T H, Chang W Y, Huang J J 2009 Acta Mater. 57 3341
[16] Hoffmann K H, Schreiber M 1996 Computational Physics (Berlin Heidelberg: Springer-Verlag) p268
[17] Imran M, Hussain F, Rashid M, Ahmad S A 2012 Chin. Phys. B 21 116201
[18] Imran M, Hussain F, Rashid M, Ahmad S A 2012 Chin. Phys. B 21 126802
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