Formation mechanism of multiple spallation and its penetration induced by shear localization in NiTi alloy under implosion loading
This study uses nonequilibrium molecular dynamics simulations to explore the dynamic failures and deformation mechanisms of a cylindrical shell composed of nanocrystalline nickel–titanium alloy under implosion loading. We discover that some individual spall planes are sequentially generated in the m...
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2025-01-01
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| Series: | Matter and Radiation at Extremes |
| Online Access: | http://dx.doi.org/10.1063/5.0235705 |
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| author | Xianye Wu Xiaoyang Pei Xiang Chen Hao Zhang Jin Wang Xin Yang Meizhen Xiang Shang Gao Fang Wang |
| author_facet | Xianye Wu Xiaoyang Pei Xiang Chen Hao Zhang Jin Wang Xin Yang Meizhen Xiang Shang Gao Fang Wang |
| author_sort | Xianye Wu |
| collection | DOAJ |
| description | This study uses nonequilibrium molecular dynamics simulations to explore the dynamic failures and deformation mechanisms of a cylindrical shell composed of nanocrystalline nickel–titanium alloy under implosion loading. We discover that some individual spall planes are sequentially generated in the material along the propagation of a radial stress wave, indicative of the formation of multiple spallation. For larger grain sizes, void nucleation at the first spallation occurs in a coexisting intergranular/transgranular manner, whereas with decreasing grain size, voids tend to nucleate along the grain boundaries. Correspondingly, the spall strength exhibits a transition from an inverse Hall–Petch to a Hall–Petch relationship. For larger grain sizes, at the secondary spallation, localized shearing zones and grain boundaries provide potential void-nucleated sites. Importantly, the formation of shear deformation bands promotes grain refinement, contributing to a reduction in the dislocation-induced strengthening effect. Consequently, a lower spall strength is produced, in contrast to the first spallation. As the grain size becomes smaller, voids nucleate mostly along grain boundaries, and plastic deformation is dominated by dense grain boundaries. Overall, the high temperature caused by shear localization leads to material weakening, and in turn there is a significant decrease in the spall strength for the secondary spallation, compared with the first. Finally, significant penetration between two spall planes is observed for large grain size, which can be attributed to the nucleation of voids on linking grain boundaries, with temperatures exceeding the melting point of the material. |
| format | Article |
| id | doaj-art-ce2fd72c986e4f529b80e53e79806e43 |
| institution | Kabale University |
| issn | 2468-080X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | Matter and Radiation at Extremes |
| spelling | doaj-art-ce2fd72c986e4f529b80e53e79806e432025-02-03T16:33:24ZengAIP Publishing LLCMatter and Radiation at Extremes2468-080X2025-01-01101017802017802-1710.1063/5.0235705Formation mechanism of multiple spallation and its penetration induced by shear localization in NiTi alloy under implosion loadingXianye Wu0Xiaoyang Pei1Xiang Chen2Hao Zhang3Jin Wang4Xin Yang5Meizhen Xiang6Shang Gao7Fang Wang8School of Materials and Energy, Southwest University, Chongqing 400715, ChinaInstitute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, ChinaSchool of Materials and Energy, Southwest University, Chongqing 400715, ChinaInstitute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, ChinaState Key Laboratory of Nuclear Physics and Technology, Center for Applied Physics and Technology, Peking University, Beijing 100871, ChinaSchool of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, ChinaLaboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, ChinaSchool of Materials and Energy, Southwest University, Chongqing 400715, ChinaSchool of Materials and Energy, Southwest University, Chongqing 400715, ChinaThis study uses nonequilibrium molecular dynamics simulations to explore the dynamic failures and deformation mechanisms of a cylindrical shell composed of nanocrystalline nickel–titanium alloy under implosion loading. We discover that some individual spall planes are sequentially generated in the material along the propagation of a radial stress wave, indicative of the formation of multiple spallation. For larger grain sizes, void nucleation at the first spallation occurs in a coexisting intergranular/transgranular manner, whereas with decreasing grain size, voids tend to nucleate along the grain boundaries. Correspondingly, the spall strength exhibits a transition from an inverse Hall–Petch to a Hall–Petch relationship. For larger grain sizes, at the secondary spallation, localized shearing zones and grain boundaries provide potential void-nucleated sites. Importantly, the formation of shear deformation bands promotes grain refinement, contributing to a reduction in the dislocation-induced strengthening effect. Consequently, a lower spall strength is produced, in contrast to the first spallation. As the grain size becomes smaller, voids nucleate mostly along grain boundaries, and plastic deformation is dominated by dense grain boundaries. Overall, the high temperature caused by shear localization leads to material weakening, and in turn there is a significant decrease in the spall strength for the secondary spallation, compared with the first. Finally, significant penetration between two spall planes is observed for large grain size, which can be attributed to the nucleation of voids on linking grain boundaries, with temperatures exceeding the melting point of the material.http://dx.doi.org/10.1063/5.0235705 |
| spellingShingle | Xianye Wu Xiaoyang Pei Xiang Chen Hao Zhang Jin Wang Xin Yang Meizhen Xiang Shang Gao Fang Wang Formation mechanism of multiple spallation and its penetration induced by shear localization in NiTi alloy under implosion loading Matter and Radiation at Extremes |
| title | Formation mechanism of multiple spallation and its penetration induced by shear localization in NiTi alloy under implosion loading |
| title_full | Formation mechanism of multiple spallation and its penetration induced by shear localization in NiTi alloy under implosion loading |
| title_fullStr | Formation mechanism of multiple spallation and its penetration induced by shear localization in NiTi alloy under implosion loading |
| title_full_unstemmed | Formation mechanism of multiple spallation and its penetration induced by shear localization in NiTi alloy under implosion loading |
| title_short | Formation mechanism of multiple spallation and its penetration induced by shear localization in NiTi alloy under implosion loading |
| title_sort | formation mechanism of multiple spallation and its penetration induced by shear localization in niti alloy under implosion loading |
| url | http://dx.doi.org/10.1063/5.0235705 |
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