Microstructural Evolution and Thermal Stability of Long Period Stacking Ordered Phases in Mg<sub>97</sub>Er<sub>2</sub>Ni<sub>1</sub> and Mg<sub>97</sub>Er<sub>2</sub>Zn<sub>1</sub> Alloys
The influence of transition metals (Ni and Zn) on the formation, morphology, and thermal stability of long-period stacking ordered (LPSO) phases in Mg<sub>97</sub>Er<sub>2</sub>N<sub>i1</sub> and Mg<sub>97</sub>Er<sub>2</sub>Zn<sub>1&...
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| author | Jian Yin Yushun Liu Guo-Zhen Zhu |
| author_facet | Jian Yin Yushun Liu Guo-Zhen Zhu |
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| description | The influence of transition metals (Ni and Zn) on the formation, morphology, and thermal stability of long-period stacking ordered (LPSO) phases in Mg<sub>97</sub>Er<sub>2</sub>N<sub>i1</sub> and Mg<sub>97</sub>Er<sub>2</sub>Zn<sub>1</sub> alloys was investigated. In the as-cast state, both alloys consist of α-Mg and LPSO phases. Heat treatment at 540 °C for 20 h dissolves block-like and lamellar LPSO phases into the α-Mg matrix in the Mg<sub>97</sub>Er<sub>2</sub>Zn<sub>1</sub> alloy, with lamellar LPSO phases reprecipitating during subsequent cooling from 540 °C to 400 °C. Comparative analysis shows that Ni significantly enhances the thermal stability of the LPSO phase compared to Zn. Ni favors the formation of block-shaped LPSO phases, while Zn facilitates lamellar LPSO precipitation within the α-Mg matrix. The LPSO phase in the Mg<sub>97</sub>Er<sub>2</sub>Ni<sub>1</sub> alloy exhibits an exceptionally high melting temperature of 605 °C, the highest reported for an LPSO phase. Additionally, heat treatment at 500 °C for 100 h preserves the area fraction of the LPSO phase in the Mg<sub>97</sub>Er<sub>2</sub>Ni<sub>1</sub> alloy, and at 540 °C for 100 h, the LPSO grains grow without phase dissolution or structural transformation of their 18R-type configuration. These findings provide valuable insights into the role of alloying transition metal elements in controlling the stability and morphology of LPSO phases, offering pathways for tailoring the morphology of the LPSO phase in the Mg-based alloys. |
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| spelling | doaj-art-3fd803a2e8cf4f4790fcc84ba1a4eddb2024-12-27T14:19:52ZengMDPI AGCrystals2073-43522024-12-011412109210.3390/cryst14121092Microstructural Evolution and Thermal Stability of Long Period Stacking Ordered Phases in Mg<sub>97</sub>Er<sub>2</sub>Ni<sub>1</sub> and Mg<sub>97</sub>Er<sub>2</sub>Zn<sub>1</sub> AlloysJian Yin0Yushun Liu1Guo-Zhen Zhu2Key Laboratory of Jiangxi Province for Modern Agricultural Equipment, School of Mechanical and Electrical Engineering, Jinggangshan University, Ji’an 343009, ChinaDepartment of Mechanical Engineering, Manitoba Institute for Materials, University of Manitoba, Winnipeg, MB R3T 5V6, CanadaDepartment of Mechanical Engineering, Manitoba Institute for Materials, University of Manitoba, Winnipeg, MB R3T 5V6, CanadaThe influence of transition metals (Ni and Zn) on the formation, morphology, and thermal stability of long-period stacking ordered (LPSO) phases in Mg<sub>97</sub>Er<sub>2</sub>N<sub>i1</sub> and Mg<sub>97</sub>Er<sub>2</sub>Zn<sub>1</sub> alloys was investigated. In the as-cast state, both alloys consist of α-Mg and LPSO phases. Heat treatment at 540 °C for 20 h dissolves block-like and lamellar LPSO phases into the α-Mg matrix in the Mg<sub>97</sub>Er<sub>2</sub>Zn<sub>1</sub> alloy, with lamellar LPSO phases reprecipitating during subsequent cooling from 540 °C to 400 °C. Comparative analysis shows that Ni significantly enhances the thermal stability of the LPSO phase compared to Zn. Ni favors the formation of block-shaped LPSO phases, while Zn facilitates lamellar LPSO precipitation within the α-Mg matrix. The LPSO phase in the Mg<sub>97</sub>Er<sub>2</sub>Ni<sub>1</sub> alloy exhibits an exceptionally high melting temperature of 605 °C, the highest reported for an LPSO phase. Additionally, heat treatment at 500 °C for 100 h preserves the area fraction of the LPSO phase in the Mg<sub>97</sub>Er<sub>2</sub>Ni<sub>1</sub> alloy, and at 540 °C for 100 h, the LPSO grains grow without phase dissolution or structural transformation of their 18R-type configuration. These findings provide valuable insights into the role of alloying transition metal elements in controlling the stability and morphology of LPSO phases, offering pathways for tailoring the morphology of the LPSO phase in the Mg-based alloys.https://www.mdpi.com/2073-4352/14/12/1092magnesiumMg-Er-NiMg-Er-Znlong period stacking order phase (LPSO) |
| spellingShingle | Jian Yin Yushun Liu Guo-Zhen Zhu Microstructural Evolution and Thermal Stability of Long Period Stacking Ordered Phases in Mg<sub>97</sub>Er<sub>2</sub>Ni<sub>1</sub> and Mg<sub>97</sub>Er<sub>2</sub>Zn<sub>1</sub> Alloys Crystals magnesium Mg-Er-Ni Mg-Er-Zn long period stacking order phase (LPSO) |
| title | Microstructural Evolution and Thermal Stability of Long Period Stacking Ordered Phases in Mg<sub>97</sub>Er<sub>2</sub>Ni<sub>1</sub> and Mg<sub>97</sub>Er<sub>2</sub>Zn<sub>1</sub> Alloys |
| title_full | Microstructural Evolution and Thermal Stability of Long Period Stacking Ordered Phases in Mg<sub>97</sub>Er<sub>2</sub>Ni<sub>1</sub> and Mg<sub>97</sub>Er<sub>2</sub>Zn<sub>1</sub> Alloys |
| title_fullStr | Microstructural Evolution and Thermal Stability of Long Period Stacking Ordered Phases in Mg<sub>97</sub>Er<sub>2</sub>Ni<sub>1</sub> and Mg<sub>97</sub>Er<sub>2</sub>Zn<sub>1</sub> Alloys |
| title_full_unstemmed | Microstructural Evolution and Thermal Stability of Long Period Stacking Ordered Phases in Mg<sub>97</sub>Er<sub>2</sub>Ni<sub>1</sub> and Mg<sub>97</sub>Er<sub>2</sub>Zn<sub>1</sub> Alloys |
| title_short | Microstructural Evolution and Thermal Stability of Long Period Stacking Ordered Phases in Mg<sub>97</sub>Er<sub>2</sub>Ni<sub>1</sub> and Mg<sub>97</sub>Er<sub>2</sub>Zn<sub>1</sub> Alloys |
| title_sort | microstructural evolution and thermal stability of long period stacking ordered phases in mg sub 97 sub er sub 2 sub ni sub 1 sub and mg sub 97 sub er sub 2 sub zn sub 1 sub alloys |
| topic | magnesium Mg-Er-Ni Mg-Er-Zn long period stacking order phase (LPSO) |
| url | https://www.mdpi.com/2073-4352/14/12/1092 |
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