Synchronized collapse and formation of long-period stacking and chemical orders in Mg85Zn6Y9

Matsushita, Masafumi; Bednarčı́k, J.; Sakata, Yuya; Akamatsu, Shutaro; Nishiyama, Norimasa; Michaliková, Jana; Yamasaki, Michiaki; Kawamura, Yoshihito

doi:10.1016/j.physb.2014.12.021

Cited by 9 publications

(8 citation statements)

References 14 publications

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“…The nature of these properties has been intensively studied by both experimental and theoretical approaches. [1][2][3][4] However, many important physical constants of Mg alloys with LPSO phase are still unclear. This is because large single crystals of LPSO phase have so far been unobtainable.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Thermal Expansion Coefficient of 18R-Synchronized Long-Period Stacking Ordered Magnesium Alloy

Yasuda

Kimura

2016

Mater. Trans.

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We measured the thermal expansion coef cients of an 18R-synchronized long-period stacking ordered magnesium alloy (Mg 85 Zn 6 Y 9 ) and an α-phase pure magnesium (α-Mg). This was achieved by using a Gandol camera, which was attached on a high precision diffractometer at SPring-8 BL40XU beamline. By using this system, ne powder diffraction data could be obtained even from a highly oriented Mg 85 Zn 6 Y 9 polycrystal at different temperatures between 95 and 440 K. The thermal expansion coef cients along a-and c-axes were determined from the re ned cell parameters. The thermal expansion coef cients of the Mg 85 Zn 6 Y 9 are smaller than those of the α-Mg.

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Section: Introductionmentioning

confidence: 99%

Measurement of Thermal Expansion Coefficient of 18R-Synchronized Long-Period Stacking Ordered Magnesium Alloy

Yasuda

Kimura

2016

Mater. Trans.

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“…These observations led us to reasonably conclude that the LPSO structure separated into the ¡-Mg and D0 3 -type structures at temperature above 673 K and then fused at 973 K. This transformation sequence depending on temperature was not previously observed at ambient pressure. 9,10) HPHT treatments of Mg 85 Zn 6 Y 9 alloy were performed at various temperatures under 3 GPa to investigate the crystal structure and microstructure of the Mg 85 Zn 6 Y 9 alloys recovered after being exposed to HPHT conditions. The XRD patterns of the Mg 85 Zn 6 Y 9 alloys recovered after being heated at various temperatures under 3 GPa are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The collapse and formation of LPSOs in Mg 85 Zn 6 Y 9 alloy have been investigated using in situ small-angle X-ray scattering (SAXS) and X-ray diffraction (XRD) analyses at temperatures below 873 K and at ambient pressure. 9,10) According to previous research, chemical and structural modulations of 18R-type LPSO in the alloy collapse at similar temperatures during heating. High-temperature phases of LPSOs have not yet been confirmed.…”

Section: Introductionmentioning

confidence: 82%

“…The sample comprised 18R-and 10H-type LPSO structures. 9,10) In situ observation of the crystal structure of Mg 85 Zn 6 Y 9 alloy at selected temperatures under 3 GPa was realized via energy-dispersive XRD using a synchrotron radiation beam on the BL14B1 beamline at SPring-8 in Japan. A highpressure cell fabricated from boron nitride (BN) and pyrophyllite was used.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Phase Relations among D03, α-Mg, and Long-Period Stacking Orders in Mg85Zn6Y9 Alloy under 3 GPa

Matsushita¹,

Sakata²,

Senzaki³

et al. 2015

Mater. Trans.

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The crystal structures of Mg 85 Zn 6 Y 9 alloy under 3 GPa were investigated between room temperature and 973 K using in situ X-ray diffraction (XRD). In addition, the crystal structures and microstructures of Mg 85 Zn 6 Y 9 alloys that were recovered after being heated at various temperatures under 3 GPa were also investigated. The in situ XRD analysis results indicated that 10H-and 18R-type long-period stacking orders (LPSOs) were stable below 673 K under 3 GPa; however, the D0 3 and ¡-Mg structures, which were not observed at ambient pressure, emerged at 873 K in the sample under 3 GPa. When the temperature was increased to 973 K, the D0 3 and ¡-Mg phases fused. The D0 3 and ¡-Mg phases were also confirmed to be present in Mg 85 Zn 6 Y 9 alloy that was recovered after being heated at 873 K under 3 GPa. In contrast, the XRD pattern of the Mg 85 Zn 6 Y 9 alloy that was recovered after being heated at 973 K under 3 GPa indicated the presence of the 18R-type LPSO, D0 3 , and ¡-Mg structures. These results indicate that three phases®18R-type LPSO, D0 3 , and ¡-Mg®were formed during cooling from the molten state at 3 GPa. These results further suggest that the D0 3 , ¡-Mg, and 18R-type LPSO are energetically very similar under 3 GPa.

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“…According to in-situ X-ray diffraction (XRD) at ambient pressures, LPSO phase forms during solidification and bcc and hcp structures are not confirmed [7]. In contrast, LPSO, bcc based superlattice (D0 3 ), and hcp phases coexist in the sample recovered from 973 K and 3 GPa.…”

Section: Introductionmentioning

confidence: 96%

D03+hcp mixed phase with nanostructures in Mg85Zn6Y9 alloy obtained by high-pressure and high-temperature treatments

et al. 2015

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Synchronized collapse and formation of long-period stacking and chemical orders in Mg85Zn6Y9

Cited by 9 publications

References 14 publications

Measurement of Thermal Expansion Coefficient of 18<i>R</i>-Synchronized Long-Period Stacking Ordered Magnesium Alloy

Measurement of Thermal Expansion Coefficient of 18<i>R</i>-Synchronized Long-Period Stacking Ordered Magnesium Alloy

Phase Relations among D0<sub>3</sub>, α-Mg, and Long-Period Stacking Orders in Mg<sub>85</sub>Zn<sub>6</sub>Y<sub>9</sub> Alloy under 3 GPa

D03+hcp mixed phase with nanostructures in Mg85Zn6Y9 alloy obtained by high-pressure and high-temperature treatments

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Synchronized collapse and formation of long-period stacking and chemical orders in Mg85Zn6Y9

Cited by 9 publications

References 14 publications

Measurement of Thermal Expansion Coefficient of 18<i>R</i>-Synchronized Long-Period Stacking Ordered Magnesium Alloy

Measurement of Thermal Expansion Coefficient of 18<i>R</i>-Synchronized Long-Period Stacking Ordered Magnesium Alloy

Phase Relations among D0<sub>3</sub>, &alpha;-Mg, and Long-Period Stacking Orders in Mg<sub>85</sub>Zn<sub>6</sub>Y<sub>9</sub> Alloy under 3 GPa

D03+hcp mixed phase with nanostructures in Mg85Zn6Y9 alloy obtained by high-pressure and high-temperature treatments

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Phase Relations among D0<sub>3</sub>, α-Mg, and Long-Period Stacking Orders in Mg<sub>85</sub>Zn<sub>6</sub>Y<sub>9</sub> Alloy under 3 GPa