Intragranular and Intergranular Crack Propagation in Nanocrystalline Ni Under Single-Cycle Mode I Loading

다국어 초록 (Multilingual Abstract)

As the first step to study the fatigue crack propagation, the molecular simulations were performed to investigate theopening, propagation and closure behaviors of intragranular and intergranular cracks in nanocrystalline Ni under single-cyclemode I loading. The atomic crack angle was proposed to characterize the crack-tip blunting and sharpening quantitatively.
There are obvious different mechanisms between intragranular and intergranular crack propagation. Intragranular crack propagationcould be induced by stacking faults and can change its direction very easily, but the intergranular crack perpendicularto the loading direction would propagate along the grain boundary and encounter strong resistance at the triple junction.
New cracks could form in the grain boundaries ahead of the original crack. Different from the traditional understanding forintragranular and intergranular cracks, however, the dislocation density increases even in the unloading process and the cracktip is possibly sharpened temporarily during loading.

참고문헌 (Reference)

1 M. F. Horstemeyer, 32 : 1473-, 2010

2 A. Stukowski, 20 : 085007-, 2012

3 L. Ma, 118 : 1399-, 2015

4 L. Ma, 68 : 253-, 2014

5 D. Faken, 2 : 279-, 1994

6 A. Stukowski, 18 : 015012-, 2010

7 Y. Mishin, 59 : 3393-, 1999

8 S. Plimpton, 117 : 1-, 1995

9 S. J. Zhou, 61 : 173-, 1998

10 P. H. Sung, 102 : 151-, 2015

11 T. Zhou, 46 : 1975-, 2009

12 T. Tang, 50 : 2977-, 2011

13 G. P. Potirniche, 27 : 1179-, 2005

14 G. P. Potirniche, 86 : 185-, 2006

15 A. Spielmannova, 567–568 : 61-, 2008

16 W. P. Wu, 109 : 66-, 2015

17 Y. Q. Zhang, 7 : 1722-, 2017

18 Y. Q. Zhang, 7 : 432-, 2017

19 K. Nishimura, 31 : 269-, 2004

20 G. P. Potirniche, 462 : 3707-, 2006

21 W. Fang, 666 : 314-, 2016

22 A. Luque, 30 : 1008-, 2007

23 P. Wang, 30 : 709-, 2015

24 R. Yasbolaghi, 226 : 106848-, 2020

25 D. Chen, 190 : 193-, 1995

26 V. Yamakov, 49 : 2713-, 2001

27 H. F. Zhou, 18 : 065002-, 2010

28 H. F. Zhou, 21 : 035706-, 2010

29 T. Shimokawa, 87 : 233-, 2015

30 Yue Xiao ; Yumei Hu, "Numerical and Experimental Fracture Study for 7003 Aluminum Alloy at Different Triaxialities" 대한금속·재료학회 27 (27): 2499-2511, 2021

31 Wenming Jiang ; Haixiao Jiang ; Guangyu Li ; Feng Guan ; Junwen Zhu ; Zitian Fan, "Microstructure, Mechanical Properties and Fracture Behavior of Magnesium/Steel Bimetal Using Compound Casting Assisted with Hot-Dip Aluminizing" 대한금속·재료학회 27 (27): 2977-2988, 2021

32 Gi Hun Lee ; Jang Hyun Kim ; Hyeon Gyu Beom, "Cohesive Zone Modeling of Crack Propagation in FCC Single Crystals via Atomistic Simulations" 대한금속·재료학회 27 (27): 584-592, 2021

33 D. Farkas, "Atomistic mechanisms of fatigue in nanocrystalline metals" 94 : 165502-, 2005

34 Y. Q. Zhang, "A molecular dynamics study of intercrystalline crack propagation in nanonickel bicrystal films with (010) twist boundary" 168 : 147-159, 2016