Formation Process of Long-Period Stacking-Ordered Structures in Mg<sub>97</sub>Zn<sub>1</sub>Y<sub>2</sub> Alloy Comprising HCP and Cubic Phases Fabricated by High-Pressure High-Temperature Annealing
As-cast Mg<sub>97</sub>Zn<sub>1</sub>Y<sub>2</sub> alloy consists of α-Mg matrix and 18R-type long-period stacking-ordered (LPSO) structures. We observed that the alloy undergoes a phase transformation to D0<sub>3</sub> superlattices and α-Mg matrix du...
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2021-06-01
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| author | Atsuki Yokota Masafumi Matsushita Naruhito Geshi Daiki Yamasaki Toru Shinmei Michiaki Yamasaki Yoshihito Kawamura |
| author_facet | Atsuki Yokota Masafumi Matsushita Naruhito Geshi Daiki Yamasaki Toru Shinmei Michiaki Yamasaki Yoshihito Kawamura |
| author_sort | Atsuki Yokota |
| collection | DOAJ |
| description | As-cast Mg<sub>97</sub>Zn<sub>1</sub>Y<sub>2</sub> alloy consists of α-Mg matrix and 18R-type long-period stacking-ordered (LPSO) structures. We observed that the alloy undergoes a phase transformation to D0<sub>3</sub> superlattices and α-Mg matrix due to high-pressure high-temperature (HPHT) annealing at 3 GPa and above 773 K. Further, the alloy recovered after HPHT annealing, consisting of the α-Mg matrix and D0<sub>3</sub> superlattices, transformed into 18R-type LPSO structures during further annealing at ambient pressure. An fcc structure with a lattice parameter of 1.42 nm, which was twice that of D0<sub>3</sub>, emerged in both the collapse process of the 18R-type LPSO structure under high-pressure, and the formation process of the 18R-type LPSO structure at ambient pressure. This fcc phase was an intermediate structure between 18R-type LPSO and D0<sub>3</sub>. From the electron diffraction results, it is considered that 18R-type LPSO is continuously present with 2H including stacking faults, which almost corresponded with previous studies. |
| first_indexed | 2024-03-09T04:51:05Z |
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| id | doaj.art-8da4b3cbc614495d93a910bd391e243c |
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| language | English |
| last_indexed | 2024-03-09T04:51:05Z |
| publishDate | 2021-06-01 |
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| spelling | doaj.art-8da4b3cbc614495d93a910bd391e243c2023-12-03T13:10:30ZengMDPI AGMetals2075-47012021-06-01117103110.3390/met11071031Formation Process of Long-Period Stacking-Ordered Structures in Mg<sub>97</sub>Zn<sub>1</sub>Y<sub>2</sub> Alloy Comprising HCP and Cubic Phases Fabricated by High-Pressure High-Temperature AnnealingAtsuki Yokota0Masafumi Matsushita1Naruhito Geshi2Daiki Yamasaki3Toru Shinmei4Michiaki Yamasaki5Yoshihito Kawamura6Department of Mechanical Engineering, Ehime University, 3-Bunkyocho, Matsuyama 790-0826, JapanDepartment of Mechanical Engineering, Ehime University, 3-Bunkyocho, Matsuyama 790-0826, JapanDepartment of Mechanical Engineering, Ehime University, 3-Bunkyocho, Matsuyama 790-0826, JapanDepartment of Mechanical Engineering, Ehime University, 3-Bunkyocho, Matsuyama 790-0826, JapanGeodynamics Research Center, Ehime University, 2-Bunkyocho, Matsuyama 790-0826, JapanMagnesium Research Center, Kumamoto University, Kumamoto 860-8555, JapanMagnesium Research Center, Kumamoto University, Kumamoto 860-8555, JapanAs-cast Mg<sub>97</sub>Zn<sub>1</sub>Y<sub>2</sub> alloy consists of α-Mg matrix and 18R-type long-period stacking-ordered (LPSO) structures. We observed that the alloy undergoes a phase transformation to D0<sub>3</sub> superlattices and α-Mg matrix due to high-pressure high-temperature (HPHT) annealing at 3 GPa and above 773 K. Further, the alloy recovered after HPHT annealing, consisting of the α-Mg matrix and D0<sub>3</sub> superlattices, transformed into 18R-type LPSO structures during further annealing at ambient pressure. An fcc structure with a lattice parameter of 1.42 nm, which was twice that of D0<sub>3</sub>, emerged in both the collapse process of the 18R-type LPSO structure under high-pressure, and the formation process of the 18R-type LPSO structure at ambient pressure. This fcc phase was an intermediate structure between 18R-type LPSO and D0<sub>3</sub>. From the electron diffraction results, it is considered that 18R-type LPSO is continuously present with 2H including stacking faults, which almost corresponded with previous studies.https://www.mdpi.com/2075-4701/11/7/1031Mg–Zn–Y ternary alloyslong-period stacking-ordered structurehigh-pressure treatmentX-ray diffractiontransmission electron microscopy |
| spellingShingle | Atsuki Yokota Masafumi Matsushita Naruhito Geshi Daiki Yamasaki Toru Shinmei Michiaki Yamasaki Yoshihito Kawamura Formation Process of Long-Period Stacking-Ordered Structures in Mg<sub>97</sub>Zn<sub>1</sub>Y<sub>2</sub> Alloy Comprising HCP and Cubic Phases Fabricated by High-Pressure High-Temperature Annealing Metals Mg–Zn–Y ternary alloys long-period stacking-ordered structure high-pressure treatment X-ray diffraction transmission electron microscopy |
| title | Formation Process of Long-Period Stacking-Ordered Structures in Mg<sub>97</sub>Zn<sub>1</sub>Y<sub>2</sub> Alloy Comprising HCP and Cubic Phases Fabricated by High-Pressure High-Temperature Annealing |
| title_full | Formation Process of Long-Period Stacking-Ordered Structures in Mg<sub>97</sub>Zn<sub>1</sub>Y<sub>2</sub> Alloy Comprising HCP and Cubic Phases Fabricated by High-Pressure High-Temperature Annealing |
| title_fullStr | Formation Process of Long-Period Stacking-Ordered Structures in Mg<sub>97</sub>Zn<sub>1</sub>Y<sub>2</sub> Alloy Comprising HCP and Cubic Phases Fabricated by High-Pressure High-Temperature Annealing |
| title_full_unstemmed | Formation Process of Long-Period Stacking-Ordered Structures in Mg<sub>97</sub>Zn<sub>1</sub>Y<sub>2</sub> Alloy Comprising HCP and Cubic Phases Fabricated by High-Pressure High-Temperature Annealing |
| title_short | Formation Process of Long-Period Stacking-Ordered Structures in Mg<sub>97</sub>Zn<sub>1</sub>Y<sub>2</sub> Alloy Comprising HCP and Cubic Phases Fabricated by High-Pressure High-Temperature Annealing |
| title_sort | formation process of long period stacking ordered structures in mg sub 97 sub zn sub 1 sub y sub 2 sub alloy comprising hcp and cubic phases fabricated by high pressure high temperature annealing |
| topic | Mg–Zn–Y ternary alloys long-period stacking-ordered structure high-pressure treatment X-ray diffraction transmission electron microscopy |
| url | https://www.mdpi.com/2075-4701/11/7/1031 |
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