Geometrically Necessary Dislocation Analysis of Deformation Mechanism for Magnesium under Fatigue Loading at 0 °C
This study focused on the analysis of geometrically necessary dislocation (GND) densities for five selected fine-grained magnesium samples. Among the samples, three were tested under different fatigue-loading conditions at 0 °C, one experienced quasi-static tensile loading at 0 °C, and one represent...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-03-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/13/3/490 |
| _version_ | 1797612500025344000 |
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| author | Qizhen Li |
| author_facet | Qizhen Li |
| author_sort | Qizhen Li |
| collection | DOAJ |
| description | This study focused on the analysis of geometrically necessary dislocation (GND) densities for five selected fine-grained magnesium samples. Among the samples, three were tested under different fatigue-loading conditions at 0 °C, one experienced quasi-static tensile loading at 0 °C, and one represented the as-rolled state. The fatigue-tested samples were chosen according to the relationship between the maximum loading stress of a test and the material’s yield strength. This study provides new insights on the deformation mechanism of fine-grained magnesium at 0 °C. It is observed that the average GND densities were increased by 95~111% for the tested samples when compared with the as-rolled sample. It is especially interesting that there is a significant increase in the average GND density for the sample that experienced the fatigue loading with a low-maximum applied stress, and the maximum applied stress was lower than the material’s yield strength. This observation implies that the grain boundary mediated the dislocation-emission mechanism. |
| first_indexed | 2024-03-11T06:43:02Z |
| format | Article |
| id | doaj.art-afb69c714faf4c79a8e7cd4f9e6c9ab9 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-11T06:43:02Z |
| publishDate | 2023-03-01 |
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| record_format | Article |
| series | Crystals |
| spelling | doaj.art-afb69c714faf4c79a8e7cd4f9e6c9ab92023-11-17T10:29:30ZengMDPI AGCrystals2073-43522023-03-0113349010.3390/cryst13030490Geometrically Necessary Dislocation Analysis of Deformation Mechanism for Magnesium under Fatigue Loading at 0 °CQizhen Li0School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164, USAThis study focused on the analysis of geometrically necessary dislocation (GND) densities for five selected fine-grained magnesium samples. Among the samples, three were tested under different fatigue-loading conditions at 0 °C, one experienced quasi-static tensile loading at 0 °C, and one represented the as-rolled state. The fatigue-tested samples were chosen according to the relationship between the maximum loading stress of a test and the material’s yield strength. This study provides new insights on the deformation mechanism of fine-grained magnesium at 0 °C. It is observed that the average GND densities were increased by 95~111% for the tested samples when compared with the as-rolled sample. It is especially interesting that there is a significant increase in the average GND density for the sample that experienced the fatigue loading with a low-maximum applied stress, and the maximum applied stress was lower than the material’s yield strength. This observation implies that the grain boundary mediated the dislocation-emission mechanism.https://www.mdpi.com/2073-4352/13/3/490magnesiumgrain boundarygeometrically necessary dislocationfatigue |
| spellingShingle | Qizhen Li Geometrically Necessary Dislocation Analysis of Deformation Mechanism for Magnesium under Fatigue Loading at 0 °C Crystals magnesium grain boundary geometrically necessary dislocation fatigue |
| title | Geometrically Necessary Dislocation Analysis of Deformation Mechanism for Magnesium under Fatigue Loading at 0 °C |
| title_full | Geometrically Necessary Dislocation Analysis of Deformation Mechanism for Magnesium under Fatigue Loading at 0 °C |
| title_fullStr | Geometrically Necessary Dislocation Analysis of Deformation Mechanism for Magnesium under Fatigue Loading at 0 °C |
| title_full_unstemmed | Geometrically Necessary Dislocation Analysis of Deformation Mechanism for Magnesium under Fatigue Loading at 0 °C |
| title_short | Geometrically Necessary Dislocation Analysis of Deformation Mechanism for Magnesium under Fatigue Loading at 0 °C |
| title_sort | geometrically necessary dislocation analysis of deformation mechanism for magnesium under fatigue loading at 0 °c |
| topic | magnesium grain boundary geometrically necessary dislocation fatigue |
| url | https://www.mdpi.com/2073-4352/13/3/490 |
| work_keys_str_mv | AT qizhenli geometricallynecessarydislocationanalysisofdeformationmechanismformagnesiumunderfatigueloadingat0c |