Orientation-dependence of incipient plasticity in a coarse-grained Mg revealed by nanoindentation pop-ins
The nanoindentation pop-in behaviors of 13 grains with diverse crystallographic orientations were analysed using a coarse-grained Mg-2 wt.% Gd alloy. Within nanoscale stressed volumes within all grains, the converted shear stresses for the first pop-in, calculated using the indentation Schmid factor...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2025-06-01
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| Series: | Journal of Magnesium and Alloys |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956725001227 |
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| author | Moein Imani Foumani Syed Taha Khursheed Yushun Liu Guo-zhen Zhu |
| author_facet | Moein Imani Foumani Syed Taha Khursheed Yushun Liu Guo-zhen Zhu |
| author_sort | Moein Imani Foumani |
| collection | DOAJ |
| description | The nanoindentation pop-in behaviors of 13 grains with diverse crystallographic orientations were analysed using a coarse-grained Mg-2 wt.% Gd alloy. Within nanoscale stressed volumes within all grains, the converted shear stresses for the first pop-in, calculated using the indentation Schmid factor, ranged from 1 to 1.3 GPa, consistent with theoretical predictions for dislocation nucleation in Mg. The estimated activation volume of the first pop-in was approximately 27–40 ų (involving about ∼2 atoms), aligning with reported atomistic simulations of the surface dislocation semi-loop nucleation. While indented near the ⟨c⟩-axis, grains exhibit higher first pop-in loads and successive pop-ins, implying the possibility of a cross-slip nucleation mechanism to accommodate ⟨c⟩-axis deformation. |
| format | Article |
| id | doaj-art-5930ecef9f9a433b8887bf0da85b2445 |
| institution | Kabale University |
| issn | 2213-9567 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Magnesium and Alloys |
| spelling | doaj-art-5930ecef9f9a433b8887bf0da85b24452025-08-20T03:50:31ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672025-06-011362554256410.1016/j.jma.2025.04.004Orientation-dependence of incipient plasticity in a coarse-grained Mg revealed by nanoindentation pop-insMoein Imani Foumani0Syed Taha Khursheed1Yushun Liu2Guo-zhen Zhu3Department of Mechanical Engineering and Manitoba Institute for Materials, University of Manitoba, Winnipeg, MB, CanadaDepartment of Mechanical Engineering and Manitoba Institute for Materials, University of Manitoba, Winnipeg, MB, CanadaDepartment of Mechanical Engineering and Manitoba Institute for Materials, University of Manitoba, Winnipeg, MB, CanadaCorresponding author.; Department of Mechanical Engineering and Manitoba Institute for Materials, University of Manitoba, Winnipeg, MB, CanadaThe nanoindentation pop-in behaviors of 13 grains with diverse crystallographic orientations were analysed using a coarse-grained Mg-2 wt.% Gd alloy. Within nanoscale stressed volumes within all grains, the converted shear stresses for the first pop-in, calculated using the indentation Schmid factor, ranged from 1 to 1.3 GPa, consistent with theoretical predictions for dislocation nucleation in Mg. The estimated activation volume of the first pop-in was approximately 27–40 ų (involving about ∼2 atoms), aligning with reported atomistic simulations of the surface dislocation semi-loop nucleation. While indented near the ⟨c⟩-axis, grains exhibit higher first pop-in loads and successive pop-ins, implying the possibility of a cross-slip nucleation mechanism to accommodate ⟨c⟩-axis deformation.http://www.sciencedirect.com/science/article/pii/S2213956725001227Incipient plasticityDislocation nucleationMagnesiumNanoindentation |
| spellingShingle | Moein Imani Foumani Syed Taha Khursheed Yushun Liu Guo-zhen Zhu Orientation-dependence of incipient plasticity in a coarse-grained Mg revealed by nanoindentation pop-ins Journal of Magnesium and Alloys Incipient plasticity Dislocation nucleation Magnesium Nanoindentation |
| title | Orientation-dependence of incipient plasticity in a coarse-grained Mg revealed by nanoindentation pop-ins |
| title_full | Orientation-dependence of incipient plasticity in a coarse-grained Mg revealed by nanoindentation pop-ins |
| title_fullStr | Orientation-dependence of incipient plasticity in a coarse-grained Mg revealed by nanoindentation pop-ins |
| title_full_unstemmed | Orientation-dependence of incipient plasticity in a coarse-grained Mg revealed by nanoindentation pop-ins |
| title_short | Orientation-dependence of incipient plasticity in a coarse-grained Mg revealed by nanoindentation pop-ins |
| title_sort | orientation dependence of incipient plasticity in a coarse grained mg revealed by nanoindentation pop ins |
| topic | Incipient plasticity Dislocation nucleation Magnesium Nanoindentation |
| url | http://www.sciencedirect.com/science/article/pii/S2213956725001227 |
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