EFFECT OF MICROSTRUCTURE ON FLOW BEHAVIOR DURING PENETRATION OF W25Fe25Ni25Mo25 HIGH-ENTROPY ALLOY PROJECTILE

Chen Haihua; Zhang Xianfeng; Zhao Wenjie; Gao Zhilin; Liu Chuang; Tan Mengting; Xiong Wei; Wang Haiying; Dai Lanhong

doi:10.6052/0459-1879-22-128

Volume 54 Issue 8

Aug. 2022

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Chinese Journal of Theoretical and Applied Mechanics > 2022 > 54(8): 2140-2151. > DOI: 10.6052/0459-1879-22-128 CSTR: 32045.14.0459-1879-22-128

Chen Haihua, Zhang Xianfeng, Zhao Wenjie, Gao Zhilin, Liu Chuang, Tan Mengting, Xiong Wei, Wang Haiying, Dai Lanhong. Effect of microstructure on flow behavior during penetration of W₂₅Fe₂₅Ni₂₅Mo₂₅ high-entropy alloy projectile. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(8): 2140-2151. DOI: 10.6052/0459-1879-22-128

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EFFECT OF MICROSTRUCTURE ON FLOW BEHAVIOR DURING PENETRATION OF W₂₅Fe₂₅Ni₂₅Mo₂₅ HIGH-ENTROPY ALLOY PROJECTILE

*.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
†.
Shanghai Electro-Mechanical Engineering Institute, Shanghai 201109, China
**.
State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

Received Date: March 24, 2022
Accepted Date: May 30, 2022
Available Online: May 31, 2022

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Abstract

Abstract

In order to explore the relationship between the macro deformation behavior of W₂₅Fe₂₅Ni₂₅Mo₂₅ high-entropy alloy projectile and the micro structure of the material in the penetration, a two-phase flow evolution model of constant cross-section straight pipe is established. The model takes the differences of soft and hard phase density, velocity and concentration into consideration based on the simplification of the two-phase flow model. By analogy with the inflow and outflow characteristics of the materials at the head of the projectile in the macro state, the analysis area is selected. The inflow and outflow relationship of the materials in the analysis area under the two-phase microstructure is established. Combined with the microstructure evolution equation, the concentration evolution results in the analysis area are given. The flow stability coefficient t/l_length characterizing the concentration evolution rate of the materials is proposed. In order to compare the penetration behavior of projectiles with different microstructures, the typical two-phase material tungsten- copper alloy (W₇₀Cu₃₀) was selected to carry out the penetration test of two kinds of projectiles into semi-infinite steel target based on small caliber ballistic gun. The microstructure evolution behavior of the two kinds of alloy projectiles is analyzed. The results show that the distribution of hard phase concentration generally reflects the characteristics of "concentrated in the center and sparse at the edge". The higher the concentration of the hard phase, the higher the density and the faster the driving speed, the smaller the flow stability coefficient t/l_length. The better the flow stability of the projectile in the penetration, and the easier it is for the projectile head material to form a continuous plastic flow zone. The two-phase flow evolution model of constant cross-section straight pipe can be used to describe the flow stability of projectile head material in the process of penetration, and reveal the correlation mechanism between projectile head deformation and two-phase microstructure in the process of penetration.
- high-entropy alloy,
- high-speed penetration,
- microstructure,
- two-phase flow

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References

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EFFECT OF MICROSTRUCTURE ON FLOW BEHAVIOR DURING PENETRATION OF W₂₅Fe₂₅Ni₂₅Mo₂₅ HIGH-ENTROPY ALLOY PROJECTILE

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EFFECT OF MICROSTRUCTURE ON FLOW BEHAVIOR DURING PENETRATION OF W₂₅Fe₂₅Ni₂₅Mo₂₅ HIGH-ENTROPY ALLOY PROJECTILE