NiTi合金强冲击荷载下微孔洞演化行为的分子动力学研究

doi:10.11896/cldb.23040134

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Abstract In this work, the molecular dynamic model of nanocrystalline NiTi was applied to explore the micro-voids evolution process under intensive impact loading. To determine the voids volume fraction inside the materials, a PYTHON code was conducted to measure voids volume during the post-process for simulation results. The voids evolution process and the micro damage mechanism of NiTi alloy were well revealed by the molecular dynamic simulation under the different parameters including impact velocity, duration time, and grain sizes. It was found that the increasing of impact velocity would promote the growth of the voids volume significantly and the transformation of damage behavior from classical spallation to micro spallation. Under the classical spallation behavior, the increasing of the impact duration time would not affect the growth rate of voids. However, it will delay the damage initial time and make the voids distribution closer to the loading boundary. Meanwhile, the simulation results also proved that the reduction of the impact duration time would make the damage behavior degenerate from the micro spallation to classical spal-lation and decrease the volume fraction of voids. Finally, the grain size effect on voids evolution was also considered in the numerical model. Under the classical spallation situation, it was discovered that the voids increasing rate would be hindered with the reduction of the grain size due to the inhibiting effect of voids growth provided by grains interaction. However, when the impact velocity increased to 3 km/s, the grain size strengthening effect would be weakened by the impact melting behavior. In this work, molecular dynamics simulation gave the microscopic description of the NiTi damage evolution process under different parameters and revealed the corresponding microscopic mechanism. The numerical results could be used for the preparation optimization of NiTi alloy and provide theoretical reference for the design of NiTi structure.

Key words： NiTi alloy voids evolution molecular dynamics impact loading

Published: 10 August 2024 Online: 2024-08-29

CLC number:

O385

Fund:Joint Fund of the National Natural Science Foundation of China and the China Academy of Engineering Physics (U1430119,U1530140).

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	CUI Yehui
	ZHAO Ang
	ZENG Xiangguo

Cite this article:

CUI Yehui,ZHAO Ang,ZENG Xiangguo. Molecular Dynamic Studies of Micro-voids Evolution Behavior Under Ultra Impact Loading for NiTi alloy[J]. Materials Reports, 2024, 38(15): 23040134-11.

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http://www.mater-rep.com/EN/10.11896/cldb.23040134 OR http://www.mater-rep.com/EN/Y2024/V38/I15/23040134

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