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Microstructure
evolution mechanism of high entropy alloys under impact
loading
Qiang Li, Weizhi Zhou and Ye Du |
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Vol. 19 (2024), No. 4, 635–649
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Abstract |
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In this article, molecular dynamics simulation method was used to establish a high entropy alloy atomic model, and different impact velocities were applied to study the impact induced high entropy alloy phase transformation and dislocation motion mechanism. It creatively reveals the evolution mechanism of thermal mechanical coupling response of FeCoCrCuNi high entropy alloy under impact loading. The results show that when the impact speed is higher than 1400 m/s, the temperature rise breaks through 5000 K under the impact, and the high entropy alloy particles become amorphous. When the impact speed reaches 1000 m/s, the atomic motion speed of Ni and Cu atoms is slightly increased compared to other elements, and the face-centered cubic (FCC) phase is largely transformed into hexagonal close-packed (HCP) phase, with the dislocation density reaching its peak. After passing through the wavefront, twinning is formed under the action of cross slip and dislocation reaction, which prevents further expansion of dislocations and forms a dislocation hollow area, enhancing the strength of localized materials. |
Keywords
molecular dynamics, high entropy alloys, microscopic
evolution, impact loading
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Milestones
Received: 6 January 2024
Revised: 4 May 2024
Accepted: 16 June 2024
Published: 18 July 2024
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Authors |
| Qiang Li | |
| College of Mechatronic
Engineering North University of China Taiyuan, 030051 China |
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| Weizhi Zhou | |
| College of Mechatronic
Engineering North University of China Taiyuan, 030051 China |
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| Ye Du | |
| College of Mechatronic
Engineering North University of China Taiyuan, 030051 China |
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| © 2024 MSP (Mathematical Sciences Publishers). |
