Rotational and translational domains of beta precipitate in aged binary Mg−Ce alloys
The structural evolution from β1 (Mg3Ce) to β (Mg12Ce) precipitates, which takes place at the over-aged stage of binary Mg−Ce alloys, are investigated by high-angle annular dark-field scanning transmission electron microscopy. The structural transformation mainly occurs in the {111}β1 crystallograph...
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KeAi Communications Co., Ltd.
2021-05-01
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| Series: | Journal of Magnesium and Alloys |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956720301717 |
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| author | B.Z. Sun H.X. Zhang Y. Dong J.X. Ren Y. Tian G.M. Xie J. Tan Y.H. Sun Na Xiao |
| author_facet | B.Z. Sun H.X. Zhang Y. Dong J.X. Ren Y. Tian G.M. Xie J. Tan Y.H. Sun Na Xiao |
| author_sort | B.Z. Sun |
| collection | DOAJ |
| description | The structural evolution from β1 (Mg3Ce) to β (Mg12Ce) precipitates, which takes place at the over-aged stage of binary Mg−Ce alloys, are investigated by high-angle annular dark-field scanning transmission electron microscopy. The structural transformation mainly occurs in the {111}β1 crystallographic planes, where the newly formed β lattices exhibit two categories of domain structures, namely rotational and translational domains. The rotational domain is composed of three β domains (βRA, βRB and βRC), which are related by a 120° rotation with respect to each other around the 〈111〉β1 axis of their β1 parent phase. The {111}β1 crystallographic planes can provide four sets of sublattices with the same orientation for an initial nucleation of β lattice. It leads to the formation of four translational β domains (βTA, βTB, βTC and βTD), among which any two differ by a vector of 1/6〈112〉β1. We deduce theoretically that there exist twenty-four β domains during this transition. However, considering the interfacial misfit, only one-third of domains can grow up and eventually forms β ribbon. Furthermore, a majority of β ribbons overlap partially β1 plate, which is beneficial to relax interfacial strain among β, β1 and α-Mg matrix (α/β/β1). The configuration of multiple β domains can effectively regulate interfacial misfit of α/β and β/β1, which are responsible for enhancing the hardness and strength of Mg−Ce alloy. Additionally, this study aims to provide some clues to improve the over-aged performance of magnesium alloys by constructing β domains and optimizing the α/β/β1 interface. |
| first_indexed | 2024-04-24T08:30:38Z |
| format | Article |
| id | doaj.art-dc8e51c503f74c098f09def0beaceb2e |
| institution | Directory Open Access Journal |
| issn | 2213-9567 |
| language | English |
| last_indexed | 2024-04-24T08:30:38Z |
| publishDate | 2021-05-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Journal of Magnesium and Alloys |
| spelling | doaj.art-dc8e51c503f74c098f09def0beaceb2e2024-04-16T20:28:13ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672021-05-019310391056Rotational and translational domains of beta precipitate in aged binary Mg−Ce alloysB.Z. Sun0H.X. Zhang1Y. Dong2J.X. Ren3Y. Tian4G.M. Xie5J. Tan6Y.H. Sun7Na Xiao8School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China; Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China; Corresponding author at: School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, ChinaSchool of Materials Science and Engineering, Northeastern University, Shenyang 110819, ChinaSchool of Materials Science and Engineering, Northeastern University, Shenyang 110819, ChinaSchool of Materials Science and Engineering, Northeastern University, Shenyang 110819, ChinaState Key Lab Rolling & Automat, Northeastern University, Shenyang 110819, ChinaSchool of Materials Science and Engineering, Northeastern University, Shenyang 110819, China; Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, ChinaAnalytical and Testing Center, Northeastern University, Shenyang 110819, ChinaAnalytical and Testing Center, Northeastern University, Shenyang 110819, China; Corresponding author.The structural evolution from β1 (Mg3Ce) to β (Mg12Ce) precipitates, which takes place at the over-aged stage of binary Mg−Ce alloys, are investigated by high-angle annular dark-field scanning transmission electron microscopy. The structural transformation mainly occurs in the {111}β1 crystallographic planes, where the newly formed β lattices exhibit two categories of domain structures, namely rotational and translational domains. The rotational domain is composed of three β domains (βRA, βRB and βRC), which are related by a 120° rotation with respect to each other around the 〈111〉β1 axis of their β1 parent phase. The {111}β1 crystallographic planes can provide four sets of sublattices with the same orientation for an initial nucleation of β lattice. It leads to the formation of four translational β domains (βTA, βTB, βTC and βTD), among which any two differ by a vector of 1/6〈112〉β1. We deduce theoretically that there exist twenty-four β domains during this transition. However, considering the interfacial misfit, only one-third of domains can grow up and eventually forms β ribbon. Furthermore, a majority of β ribbons overlap partially β1 plate, which is beneficial to relax interfacial strain among β, β1 and α-Mg matrix (α/β/β1). The configuration of multiple β domains can effectively regulate interfacial misfit of α/β and β/β1, which are responsible for enhancing the hardness and strength of Mg−Ce alloy. Additionally, this study aims to provide some clues to improve the over-aged performance of magnesium alloys by constructing β domains and optimizing the α/β/β1 interface.http://www.sciencedirect.com/science/article/pii/S2213956720301717Magnesium alloysHAADF-STEMRotational domainTranslational domainPhase transitionInterfacial misfit |
| spellingShingle | B.Z. Sun H.X. Zhang Y. Dong J.X. Ren Y. Tian G.M. Xie J. Tan Y.H. Sun Na Xiao Rotational and translational domains of beta precipitate in aged binary Mg−Ce alloys Journal of Magnesium and Alloys Magnesium alloys HAADF-STEM Rotational domain Translational domain Phase transition Interfacial misfit |
| title | Rotational and translational domains of beta precipitate in aged binary Mg−Ce alloys |
| title_full | Rotational and translational domains of beta precipitate in aged binary Mg−Ce alloys |
| title_fullStr | Rotational and translational domains of beta precipitate in aged binary Mg−Ce alloys |
| title_full_unstemmed | Rotational and translational domains of beta precipitate in aged binary Mg−Ce alloys |
| title_short | Rotational and translational domains of beta precipitate in aged binary Mg−Ce alloys |
| title_sort | rotational and translational domains of beta precipitate in aged binary mg ce alloys |
| topic | Magnesium alloys HAADF-STEM Rotational domain Translational domain Phase transition Interfacial misfit |
| url | http://www.sciencedirect.com/science/article/pii/S2213956720301717 |
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