含空洞镍基单晶高温合金力学性能的分子动力学研究

doi:10.11896/cldb.21100100

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Abstract Nickel-based single crystal superalloys have been widely used in aerospace due to their superior properties, but there are inevitable void defects in the manufacturing process, which affect the mechanical properties of the alloy. The effects of temperature, strain rate and void shape on the tensile mechanical properties and dislocation evolution of nickel-based single crystal superalloy have been studied by molecular dynamics simulation. Results show that temperature and strain rate affect the mechanical properties of materials. With the increase of temperature, Young's modulus, yield strength and material strength are all decreased;With the increase of strain rate, the young's modulus of the material remains unchanged and the yield strength increases. In addition, the presence of voids reduces the strength and Young's modulus of the material. Young's modulus of models with different shapes of voids is the same, while strength of those is different. Due to the acute angle of the diamond-shaped void, the dislocations are more likely to aggregate, the yield strength is smaller, and it is more likely to be broken during the stretching process.

Key words： nickel-based single crystal superalloy molecular dynamics simulation voids mechanical property dislocation evolution

Published: 10 August 2023 Online: 2023-08-07

CLC number:	V232.4
	O346.3

Fund:2020 Key Research Project in Hebei Province(JMRH2020-27),Hebei Provincial Science and Technology Project Grants(20311007D),Hebei Provincial Key R & D Program (22351008D), and Key Projects in Hebei Province (SJMYF2022X04).

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	Articles by authors
	DONG Huicong
	YANG Liu
	GENG Changjian
	SU Ru
	LIU Meng

Cite this article:

DONG Huicong,YANG Liu,GENG Changjian, et al. Molecular Dynamics Study on Mechanical Properties of Nickel-based Single Crystal Superalloys Containing Voids[J]. Materials Reports, 2023, 37(15): 21100100-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21100100 OR http://www.mater-rep.com/EN/Y2023/V37/I15/21100100

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