Effect of High Strain Rates on Adiabatic Shear Bands Evolution and Mechanical Performance of Dual-Phase Ti Alloy
In the present work, the adiabatic shear characteristics of our recently designed α + β dual-phase Ti alloy at different strain rates have been investigated by hat shaped specimen. The deformation process is divided into three stages: work hardening stage, steady stage, and unstable thermal softenin...
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Frontiers Media S.A.
2022-02-01
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| Series: | Frontiers in Materials |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmats.2021.808244/full |
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| author | Fang Hao Fang Hao Yuxuan Du William Yi Wang William Yi Wang Youchuan Mao Youchuan Mao Junlei Yin Chengxiong Zou Chengxiong Zou Haisheng Chen Kaixuan Wang Yong Feng Yong Feng Xianghong Liu Jinshan Li Jinshan Li |
| author_facet | Fang Hao Fang Hao Yuxuan Du William Yi Wang William Yi Wang Youchuan Mao Youchuan Mao Junlei Yin Chengxiong Zou Chengxiong Zou Haisheng Chen Kaixuan Wang Yong Feng Yong Feng Xianghong Liu Jinshan Li Jinshan Li |
| author_sort | Fang Hao |
| collection | DOAJ |
| description | In the present work, the adiabatic shear characteristics of our recently designed α + β dual-phase Ti alloy at different strain rates have been investigated by hat shaped specimen. The deformation process is divided into three stages: work hardening stage, steady stage, and unstable thermal softening stage. Along or near the shear deformation paths, the microvoids and the cracks can be captured at the strain rate of 1.8 × 104 s−1, 2.0 × 104 s−1, and 2.3 × 104 s−1, both of which contribute to the stable and unstable softening. It is found that dynamic stored energy of cold work will be significantly improved by the enhanced high strain rate. In the view of coupling analysis of inverse pole figure and grain boundary map, it seems that low angle grain boundaries present a good resistance to the formation of cracks and thermal softening. On the contrary, high angles grain boundaries are typically located in ASBs and their affecting regions, which is in line with the reported results. While the geometrical necessary dislocation (GND) density of adiabatic shear band (ASB) and its surroundings increased significantly, the width of the ASB becomes wider as the strain rate increases, which is consistent with the theory of sub-grain rotation dynamic recrystallization model. The formation of multiple ASBs in the corner position is schematically illustrated and the average elastic modulus and hardness of the ASB region are lower than the α and β phases, combined with the GND analysis, which proves that the ASB is a thermal softening zone in this experiment. |
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| last_indexed | 2024-12-24T01:02:35Z |
| publishDate | 2022-02-01 |
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| series | Frontiers in Materials |
| spelling | doaj.art-c5cdf0c4b13d4bdd8475c616493456262022-12-21T17:23:20ZengFrontiers Media S.A.Frontiers in Materials2296-80162022-02-01810.3389/fmats.2021.808244808244Effect of High Strain Rates on Adiabatic Shear Bands Evolution and Mechanical Performance of Dual-Phase Ti AlloyFang Hao0Fang Hao1Yuxuan Du2William Yi Wang3William Yi Wang4Youchuan Mao5Youchuan Mao6Junlei Yin7Chengxiong Zou8Chengxiong Zou9Haisheng Chen10Kaixuan Wang11Yong Feng12Yong Feng13Xianghong Liu14Jinshan Li15Jinshan Li16State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, ChinaWestern Superconducting Technologies Co. Ltd., Xi’an, ChinaWestern Superconducting Technologies Co. Ltd., Xi’an, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, ChinaChongqing Innovation Center of Northwestern Polytechnical University, Chongqing, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, ChinaWestern Superconducting Technologies Co. Ltd., Xi’an, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, ChinaChongqing Innovation Center of Northwestern Polytechnical University, Chongqing, ChinaWestern Superconducting Technologies Co. Ltd., Xi’an, ChinaWestern Superconducting Technologies Co. Ltd., Xi’an, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, ChinaWestern Superconducting Technologies Co. Ltd., Xi’an, ChinaWestern Superconducting Technologies Co. Ltd., Xi’an, ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, ChinaChongqing Innovation Center of Northwestern Polytechnical University, Chongqing, ChinaIn the present work, the adiabatic shear characteristics of our recently designed α + β dual-phase Ti alloy at different strain rates have been investigated by hat shaped specimen. The deformation process is divided into three stages: work hardening stage, steady stage, and unstable thermal softening stage. Along or near the shear deformation paths, the microvoids and the cracks can be captured at the strain rate of 1.8 × 104 s−1, 2.0 × 104 s−1, and 2.3 × 104 s−1, both of which contribute to the stable and unstable softening. It is found that dynamic stored energy of cold work will be significantly improved by the enhanced high strain rate. In the view of coupling analysis of inverse pole figure and grain boundary map, it seems that low angle grain boundaries present a good resistance to the formation of cracks and thermal softening. On the contrary, high angles grain boundaries are typically located in ASBs and their affecting regions, which is in line with the reported results. While the geometrical necessary dislocation (GND) density of adiabatic shear band (ASB) and its surroundings increased significantly, the width of the ASB becomes wider as the strain rate increases, which is consistent with the theory of sub-grain rotation dynamic recrystallization model. The formation of multiple ASBs in the corner position is schematically illustrated and the average elastic modulus and hardness of the ASB region are lower than the α and β phases, combined with the GND analysis, which proves that the ASB is a thermal softening zone in this experiment.https://www.frontiersin.org/articles/10.3389/fmats.2021.808244/fullTi alloymicrostructureadiabatic shear bandshigh strain ratenanoindentation |
| spellingShingle | Fang Hao Fang Hao Yuxuan Du William Yi Wang William Yi Wang Youchuan Mao Youchuan Mao Junlei Yin Chengxiong Zou Chengxiong Zou Haisheng Chen Kaixuan Wang Yong Feng Yong Feng Xianghong Liu Jinshan Li Jinshan Li Effect of High Strain Rates on Adiabatic Shear Bands Evolution and Mechanical Performance of Dual-Phase Ti Alloy Frontiers in Materials Ti alloy microstructure adiabatic shear bands high strain rate nanoindentation |
| title | Effect of High Strain Rates on Adiabatic Shear Bands Evolution and Mechanical Performance of Dual-Phase Ti Alloy |
| title_full | Effect of High Strain Rates on Adiabatic Shear Bands Evolution and Mechanical Performance of Dual-Phase Ti Alloy |
| title_fullStr | Effect of High Strain Rates on Adiabatic Shear Bands Evolution and Mechanical Performance of Dual-Phase Ti Alloy |
| title_full_unstemmed | Effect of High Strain Rates on Adiabatic Shear Bands Evolution and Mechanical Performance of Dual-Phase Ti Alloy |
| title_short | Effect of High Strain Rates on Adiabatic Shear Bands Evolution and Mechanical Performance of Dual-Phase Ti Alloy |
| title_sort | effect of high strain rates on adiabatic shear bands evolution and mechanical performance of dual phase ti alloy |
| topic | Ti alloy microstructure adiabatic shear bands high strain rate nanoindentation |
| url | https://www.frontiersin.org/articles/10.3389/fmats.2021.808244/full |
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