Plastic deformation mechanism transition of Ti/Ni nanolaminate with pre-existing crack: Molecular dynamics study

doi:10.1088/1674-1056/aba2e5

中国物理B ›› 2020, Vol. 29 ›› Issue (11): 116201-.doi: 10.1088/1674-1056/aba2e5

Meng-Jia Su(宿梦嘉)¹^,², Qiong Deng(邓琼)¹^,²^,†(), Min-Rong An(安敏荣)³^,^‡(), Lan-Ting Liu(刘兰亭)¹^,²

收稿日期:2020-05-08 修回日期:2020-06-13 接受日期:2020-07-06 出版日期:2020-11-05 发布日期:2020-11-03

Plastic deformation mechanism transition of Ti/Ni nanolaminate with pre-existing crack: Molecular dynamics study

Meng-Jia Su(宿梦嘉)^{1, 2}, Qiong Deng(邓琼)^{1, 2,}†, Min-Rong An(安敏荣)^{3,, ‡}, and Lan-Ting Liu(刘兰亭)^{1, 2}

1 Fundamental Science on Aircraft Structural Mechanics and Strength Laboratory, Northwestern Polytechnical University, Xi’an 710072, China
2 School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
3 College of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, China

Received:2020-05-08 Revised:2020-06-13 Accepted:2020-07-06 Online:2020-11-05 Published:2020-11-03
Contact: ^†Corresponding author. E-mail: dengqiong24@nwpu.edu.cn ^‡Corresponding author. E-mail: amr_lr@126.com
Supported by:
the National Natural Science Foundation of China (Grant No. 11572259), the Program for International Cooperation and Exchanges of Shaanxi Province, China (Grant No. 2016KW-049), the Natural Science Foundation of Shaanxi Province, China (Grant No. 2019JQ-827), and the Scientific Research Program Funded by Shaanxi Provincial Education Department, China (Grant No. 19JK0672).

摘要/Abstract

Abstract:

Tensile behaviors of Ti/Ni nanolaminate with model-I crack are investigated by molecular dynamics simulations. The Ti/Ni nanolaminates with center crack either in Ti layer or in Ni layer under different loading directions are utilized to systematically study the mechanical performance of the cracked material. The results indicate that pre-existing crack dramatically changes the plastic deformation mechanism of the Ti/Ni nanolaminate. Unlike the initial plastic deformation originating from the interface or weak Ti layer of the crack-free samples, the plastic behavior of cracked Ti/Ni nanolaminate first occurs at the crack tip due to the local stress concentration. Subsequent plastic deformation is dominated by the interaction between the crack and interface. The Ti/Ni interface not only impedes the movement of the initial plastic deformation carriers (dislocation, slip band, and deformation twinning) from the crack tip, but also promotes the movement of interfacial dislocations in the tension process. Microstructure evolution analysis further confirms that the plastic deformation mechanism transition is ascribed to the orientation-dependent tensile behavior at the crack tip, which is intrinsically attributed to the anisotropy of the certain crystal structure and loading direction of the cracked Ti/Ni nanolaminate. In addition, by analyzing the effects of different plastic deformation carriers on crack propagation in specific crystal, it can be discovered that the interfacial dislocations moving towards the crack tip can further promote the crack growth.

Key words: molecular dynamics, Ti/Ni nanolaminate, plastic deformation mechanisms, crack propagation

Meng-Jia Su(宿梦嘉), Qiong Deng(邓琼), Min-Rong An(安敏荣), Lan-Ting Liu(刘兰亭). [J]. 中国物理B, 2020, 29(11): 116201-.

Meng-Jia Su(宿梦嘉), Qiong Deng(邓琼)†, Min-Rong An(安敏荣), and Lan-Ting Liu(刘兰亭). Plastic deformation mechanism transition of Ti/Ni nanolaminate with pre-existing crack: Molecular dynamics study[J]. Chin. Phys. B, 2020, 29(11): 116201-.

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参考文献 47

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Orientation	Models	Crack	Plastic behavior	Burgers vector
Y direction (parallel to the interface)		in Ti	phase transformation and partial dislocations	–
	Ti/Ni nanolaminates		(FCC-Ti)	1/6〈112〉
		in Ni	full dislocations and multiple dislocations	1/2〈110〉
				–
	pure Ti		phase transformation and partial dislocations	–
			(FCC-Ti)	1/6〈112〉
	pure Ni		full dislocations	1/2〈110〉
Z direction (perpendicular to the interface)	Ti/Ni nanolaminates	in Ti	slip bands grain reorientation and twinning	–
	Ti/Ni nanolaminates	in Ni	partial dislocations	1/6〈112〉
	pure Ti		slip bands grain reorientation and twinning	–
	pure Ni		partial dislocations and full dislocations	1/6〈112〉 1/2〈110〉

Plastic deformation mechanism transition of Ti/Ni nanolaminate with pre-existing crack: Molecular dynamics study

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