Microstructural evolution of Mg–14Gd–0.4Zr alloy during compressive creep
The present work reports the creep behavior and microstructural evolution of the sand-cast Mg–14Gd–0.4Zr alloy (wt.%) prepared by the differential pressure casting machine. Their compressive creep tests at 250 °C were performed under various applied stresses (i.e., 60, 80 and 100 MPa). Among them, t...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-09-01
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| Series: | Journal of Magnesium and Alloys |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956723002049 |
| _version_ | 1797630643525386240 |
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| author | Hui Shi Yuanding Huang Lixiang Yang Chunquan Liu Hajo Dieringa Chong Lu Lv Xiao Regine Willumeit-Römer Norbert Hort |
| author_facet | Hui Shi Yuanding Huang Lixiang Yang Chunquan Liu Hajo Dieringa Chong Lu Lv Xiao Regine Willumeit-Römer Norbert Hort |
| author_sort | Hui Shi |
| collection | DOAJ |
| description | The present work reports the creep behavior and microstructural evolution of the sand-cast Mg–14Gd–0.4Zr alloy (wt.%) prepared by the differential pressure casting machine. Their compressive creep tests at 250 °C were performed under various applied stresses (i.e., 60, 80 and 100 MPa). Among them, the sand-cast Mg–14Gd–0.4Zr samples examined under 250 °C/80 MPa for 39 and 95 h, respectively, were chosen to systemically analyze their creep mechanisms using high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). The obtained results showed that the enhancement of creep resistance can be mainly attributed to the coherent β' and β'F phases with an alternate distribution, effectively impeding the basal <a> dislocations movement. However, with the creep time increasing, the fine β'+β'F precipitate chains coarsened and transformed to semi-coherent β1 phase and even to large incoherent β phase (surrounded by precipitate-free areas) in grain interiors. The precipitate-free zones (PFZs) at grain boundaries (GBs) were formed, and they could expand during creep deformation. Apart from the main cross-slip of basal and prismatic <a> dislocations, <c + a> type dislocations were activated and tended to distribute near the GBs. The aforementioned phenomena induced the stress concentrations, consequently leading to the increment of the creep strain. |
| first_indexed | 2024-03-11T11:11:05Z |
| format | Article |
| id | doaj.art-f855961e704c4fd9916c9102a32d88a6 |
| institution | Directory Open Access Journal |
| issn | 2213-9567 |
| language | English |
| last_indexed | 2024-03-11T11:11:05Z |
| publishDate | 2023-09-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Magnesium and Alloys |
| spelling | doaj.art-f855961e704c4fd9916c9102a32d88a62023-11-12T04:40:02ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672023-09-0111931613173Microstructural evolution of Mg–14Gd–0.4Zr alloy during compressive creepHui Shi0Yuanding Huang1Lixiang Yang2Chunquan Liu3Hajo Dieringa4Chong Lu5Lv Xiao6Regine Willumeit-Römer7Norbert Hort8Institute of Metallic Biomaterials, Helmholtz-Zentrum Hereon, Max-Planck-Str.1, Geesthacht 21502, GermanyInstitute of Metallic Biomaterials, Helmholtz-Zentrum Hereon, Max-Planck-Str.1, Geesthacht 21502, Germany; Corresponding authors.Research and Development Center, Shanghai Spaceflight Precision Machinery Research Institute, Shanghai 201600, China; Corresponding authors.School of Mechanical Engineering, Guizhou University, Guiyang 550025, ChinaInstitute of Material and Process Design, Helmholtz-Zentrum Hereon, Max-Planck-Str.1, Geesthacht 21502, GermanyThe Instrument Analysis Center, Shanghai Jiaotong University, Shanghai 200240, ChinaResearch and Development Center, Shanghai Spaceflight Precision Machinery Research Institute, Shanghai 201600, China; Corresponding authors.Institute of Metallic Biomaterials, Helmholtz-Zentrum Hereon, Max-Planck-Str.1, Geesthacht 21502, GermanyInstitute of Metallic Biomaterials, Helmholtz-Zentrum Hereon, Max-Planck-Str.1, Geesthacht 21502, Germany; Institute of Product Technology and Systems, Leuphana University Lüneburg, Universitätsallee 1, Lüneburg D 21335, GermanyThe present work reports the creep behavior and microstructural evolution of the sand-cast Mg–14Gd–0.4Zr alloy (wt.%) prepared by the differential pressure casting machine. Their compressive creep tests at 250 °C were performed under various applied stresses (i.e., 60, 80 and 100 MPa). Among them, the sand-cast Mg–14Gd–0.4Zr samples examined under 250 °C/80 MPa for 39 and 95 h, respectively, were chosen to systemically analyze their creep mechanisms using high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). The obtained results showed that the enhancement of creep resistance can be mainly attributed to the coherent β' and β'F phases with an alternate distribution, effectively impeding the basal <a> dislocations movement. However, with the creep time increasing, the fine β'+β'F precipitate chains coarsened and transformed to semi-coherent β1 phase and even to large incoherent β phase (surrounded by precipitate-free areas) in grain interiors. The precipitate-free zones (PFZs) at grain boundaries (GBs) were formed, and they could expand during creep deformation. Apart from the main cross-slip of basal and prismatic <a> dislocations, <c + a> type dislocations were activated and tended to distribute near the GBs. The aforementioned phenomena induced the stress concentrations, consequently leading to the increment of the creep strain.http://www.sciencedirect.com/science/article/pii/S2213956723002049Magnesium alloysCreep propertyMicrostructuresPrecipitate chainsDislocation |
| spellingShingle | Hui Shi Yuanding Huang Lixiang Yang Chunquan Liu Hajo Dieringa Chong Lu Lv Xiao Regine Willumeit-Römer Norbert Hort Microstructural evolution of Mg–14Gd–0.4Zr alloy during compressive creep Journal of Magnesium and Alloys Magnesium alloys Creep property Microstructures Precipitate chains Dislocation |
| title | Microstructural evolution of Mg–14Gd–0.4Zr alloy during compressive creep |
| title_full | Microstructural evolution of Mg–14Gd–0.4Zr alloy during compressive creep |
| title_fullStr | Microstructural evolution of Mg–14Gd–0.4Zr alloy during compressive creep |
| title_full_unstemmed | Microstructural evolution of Mg–14Gd–0.4Zr alloy during compressive creep |
| title_short | Microstructural evolution of Mg–14Gd–0.4Zr alloy during compressive creep |
| title_sort | microstructural evolution of mg 14gd 0 4zr alloy during compressive creep |
| topic | Magnesium alloys Creep property Microstructures Precipitate chains Dislocation |
| url | http://www.sciencedirect.com/science/article/pii/S2213956723002049 |
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