Unraveling Anisotropy in Crystalline Orientation under Shock-Induced Dynamic Responses in High-Entropy Alloy Co<sub>25</sub>Ni<sub>25</sub>Fe<sub>25</sub>Al<sub>7.5</sub>Cu<sub>17.5</sub>
Shock-induced plastic deformation and spall damage in the single-crystalline FCC Co<sub>25</sub>Ni<sub>25</sub>Fe<sub>25</sub>Al<sub>7.5</sub>Cu<sub>17.5</sub> high-entropy alloy (HEA) under varying shock intensities were systematically inv...
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| Format: | Article |
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MDPI AG
2023-08-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/17/2446 |
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| author | Yongchao Wu Jianli Shao |
| author_facet | Yongchao Wu Jianli Shao |
| author_sort | Yongchao Wu |
| collection | DOAJ |
| description | Shock-induced plastic deformation and spall damage in the single-crystalline FCC Co<sub>25</sub>Ni<sub>25</sub>Fe<sub>25</sub>Al<sub>7.5</sub>Cu<sub>17.5</sub> high-entropy alloy (HEA) under varying shock intensities were systematically investigated using large-scale molecular dynamics simulations. The study reveals the significant influence of crystalline orientation on the deformation mechanism and spall damage. Specifically, the shock wave velocities in the [110] and [111] directions are significantly higher than that in the [001] direction, resulting in a two-zone elastic-plastic shock wave structure observed in the [110] and [111] samples, while only a single-wave structure is found in the [001] sample. The plastic deformation is dominated by the FCC to BCC transformation following the Bain path and a small amount of stacking faults during the compression stage in the [001] sample, whereas it depends on the stacking faults induced by Shockley dislocation motion in the [110] and [111] samples. The stacking faults and phase transformation in the [001] sample exhibit high reversibility under release effects, while extensive dislocations are present in the [110] and [111] samples after release. Interestingly, tension-strain-induced FCC to BCC phase transformation is observed in the [001] sample during the release stage, resulting in increased spall strength compared to the [110] and [111] samples. The spall strength estimated from both bulk and free surface velocity history shows reasonable consistency. Additionally, the spall strength remains stable with increasing shock intensities. The study discusses in detail the shock wave propagation, microstructure change, and spall damage evolution. Overall, our comprehensive studies provide deep insights into the deformation and fracture mechanisms of Co<sub>25</sub>Ni<sub>25</sub>Fe<sub>25</sub>Al<sub>7.5</sub>Cu<sub>17.5</sub> HEA under shock loading, contributing to a better understanding of dynamic deformation under extreme environments. |
| first_indexed | 2024-03-10T23:16:31Z |
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| institution | Directory Open Access Journal |
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| language | English |
| last_indexed | 2024-03-10T23:16:31Z |
| publishDate | 2023-08-01 |
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| series | Nanomaterials |
| spelling | doaj.art-8b6ee998461f4aae95855c34e0fccdac2023-11-19T08:36:47ZengMDPI AGNanomaterials2079-49912023-08-011317244610.3390/nano13172446Unraveling Anisotropy in Crystalline Orientation under Shock-Induced Dynamic Responses in High-Entropy Alloy Co<sub>25</sub>Ni<sub>25</sub>Fe<sub>25</sub>Al<sub>7.5</sub>Cu<sub>17.5</sub>Yongchao Wu0Jianli Shao1State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaState Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaShock-induced plastic deformation and spall damage in the single-crystalline FCC Co<sub>25</sub>Ni<sub>25</sub>Fe<sub>25</sub>Al<sub>7.5</sub>Cu<sub>17.5</sub> high-entropy alloy (HEA) under varying shock intensities were systematically investigated using large-scale molecular dynamics simulations. The study reveals the significant influence of crystalline orientation on the deformation mechanism and spall damage. Specifically, the shock wave velocities in the [110] and [111] directions are significantly higher than that in the [001] direction, resulting in a two-zone elastic-plastic shock wave structure observed in the [110] and [111] samples, while only a single-wave structure is found in the [001] sample. The plastic deformation is dominated by the FCC to BCC transformation following the Bain path and a small amount of stacking faults during the compression stage in the [001] sample, whereas it depends on the stacking faults induced by Shockley dislocation motion in the [110] and [111] samples. The stacking faults and phase transformation in the [001] sample exhibit high reversibility under release effects, while extensive dislocations are present in the [110] and [111] samples after release. Interestingly, tension-strain-induced FCC to BCC phase transformation is observed in the [001] sample during the release stage, resulting in increased spall strength compared to the [110] and [111] samples. The spall strength estimated from both bulk and free surface velocity history shows reasonable consistency. Additionally, the spall strength remains stable with increasing shock intensities. The study discusses in detail the shock wave propagation, microstructure change, and spall damage evolution. Overall, our comprehensive studies provide deep insights into the deformation and fracture mechanisms of Co<sub>25</sub>Ni<sub>25</sub>Fe<sub>25</sub>Al<sub>7.5</sub>Cu<sub>17.5</sub> HEA under shock loading, contributing to a better understanding of dynamic deformation under extreme environments.https://www.mdpi.com/2079-4991/13/17/2446shock responsehigh-entropy alloyphase transformationspall damagemolecular dynamics |
| spellingShingle | Yongchao Wu Jianli Shao Unraveling Anisotropy in Crystalline Orientation under Shock-Induced Dynamic Responses in High-Entropy Alloy Co<sub>25</sub>Ni<sub>25</sub>Fe<sub>25</sub>Al<sub>7.5</sub>Cu<sub>17.5</sub> Nanomaterials shock response high-entropy alloy phase transformation spall damage molecular dynamics |
| title | Unraveling Anisotropy in Crystalline Orientation under Shock-Induced Dynamic Responses in High-Entropy Alloy Co<sub>25</sub>Ni<sub>25</sub>Fe<sub>25</sub>Al<sub>7.5</sub>Cu<sub>17.5</sub> |
| title_full | Unraveling Anisotropy in Crystalline Orientation under Shock-Induced Dynamic Responses in High-Entropy Alloy Co<sub>25</sub>Ni<sub>25</sub>Fe<sub>25</sub>Al<sub>7.5</sub>Cu<sub>17.5</sub> |
| title_fullStr | Unraveling Anisotropy in Crystalline Orientation under Shock-Induced Dynamic Responses in High-Entropy Alloy Co<sub>25</sub>Ni<sub>25</sub>Fe<sub>25</sub>Al<sub>7.5</sub>Cu<sub>17.5</sub> |
| title_full_unstemmed | Unraveling Anisotropy in Crystalline Orientation under Shock-Induced Dynamic Responses in High-Entropy Alloy Co<sub>25</sub>Ni<sub>25</sub>Fe<sub>25</sub>Al<sub>7.5</sub>Cu<sub>17.5</sub> |
| title_short | Unraveling Anisotropy in Crystalline Orientation under Shock-Induced Dynamic Responses in High-Entropy Alloy Co<sub>25</sub>Ni<sub>25</sub>Fe<sub>25</sub>Al<sub>7.5</sub>Cu<sub>17.5</sub> |
| title_sort | unraveling anisotropy in crystalline orientation under shock induced dynamic responses in high entropy alloy co sub 25 sub ni sub 25 sub fe sub 25 sub al sub 7 5 sub cu sub 17 5 sub |
| topic | shock response high-entropy alloy phase transformation spall damage molecular dynamics |
| url | https://www.mdpi.com/2079-4991/13/17/2446 |
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