In situ measurements on stability of long-period stacking-ordered structures in Mg85Y9Zn6 alloys during heating examined by multicolor synchrotron radiation small-angle scattering

Okuda, Hiroshi; Horiuchi, Toshiki; Yamasaki, Michiaki; Kawamura, Yoshihito; Kohara, Shinji

doi:10.1016/j.scriptamat.2013.11.021

Cited by 26 publications

(15 citation statements)

References 14 publications

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“…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: 77%

“…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 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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Section: Introductionmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

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 broad peak appearing between 5 nm ¹1 and 6 nm ¹1 is the interference between L1 2 clusters in the segregated layers. 16,17,24) During heating, the main LPSO periodicity appearing in the sample was 18R for the 3-5 composition, and weak 10H are also observed in the as-cast sample. The 10H peak disappeared at lower temperatures than 18R did, due to relative instability.…”

Section: ¹1mentioning

confidence: 94%

“…4,7) In contrast, several works using synchrotron radiation 4,16,17) and scanning probe microscopy 22) showed that the periodicity that appears first in the alloy system does not necessarily the most stable one, and the in-plane order structure in the segregated layer may change with time, temperature and composition.…”

Section: Introductionmentioning

confidence: 98%

Stability of Long-Period Stacking Ordered Structures at Elevated Temperatures Examined by Multicolor Synchrotron Radiation X-ray Scattering/Diffraction Measurements

et al. 2015

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Stability of long-period stacking ordered (LPSO) structures of Mg-Zn-Y ternary alloys at elevated temperatures was examined by multicolor synchrotron radiation small-and medium-angle scattering/diffraction. The LPSO structures directly melted during heating, and the formation of LPSO was observed from supercooled liquid. The temperatures of complete dissolution and the onset of formation of LPSO phases were measured by monitoring the first diffraction peak of 14H, 18R and 10H compositional modulation. The stability of composition modulation in c axis direction was found to be the same as that of L1 2 cluster ordering in the segregation layer in both heating and cooling processes, i.e., dissolution and formation. Supercooling of LPSO was obtained for the heating/cooling rate of 10 K/min.

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Utilizing Synchrotron Radiation for the Characterization of Biodegradable Magnesium Alloys—From Alloy Development to the Application as Implant Material

et al. 2021

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Magnesium (Mg)-based alloys are investigated for the use as lightweight structural metals, e.g., in the automotive industry, [1] as biodegradable implant materials [2] and for hydrogen storage. [3] The choice of alloying system and subsequent processing of the material is a crucial factor for the degradation profile of the alloy and its mechanical properties. [4][5][6][7] This review focuses on use of Mg alloys as implant material, with some references to its application as a structural metal.The degradation profile of Mg alloys is of particular importance for their application as implant materials, as a controlled degradation is required to ensure cell viability and implant stability in vivo. [8,9] During the development of Mg alloys for the application as a biodegradable implant, alloying systems are carefully selected and manufactured, with their microstructure being tailored according to specifications by selecting the appropriate processing route. The microstructure and the mechanical properties of the alloy will be evaluated and the alloy is then tested for in vitro degradation in an aqueous environment under physiological conditions (pH %7.4, 37 C, 5% CO 2 , 21% O 2 , 95% rel. humidity) with and without cells to assess its general degradation properties and cell viability. [10] The mechanical properties and degradation profile need to be tailored depending on the application of the implant. Mg alloys for bone support, for example, require mechanical properties close to that of bone. For bone, the average Young's modulus is between 7 and 31 GPa, depending on the type of bone and its hydration state. [11,12] In longitudinal direction, the bone's tensile and compressive ultimate strength have been reported to be between 93 and 135 MPa, and 154 and 205 MPa, respectively. [13,14] Finally, the elongation to failure of the clinically approved MAGNEZIX screw by Syntellix AG (Hanover, Germany) was determined to be 8%. [15] By contrast, Mg alloys designed for the use as stents must possess a minimum ultimate tensile strength of 300 MPa, low yield strength of 200-300 MPa, and higher ductility (min. 15%-18% elongation to failure, preferably 30%) for their successful deployment. [16,17] Finally, in vivo animal experiments are conducted to evaluate the alloy suitability for the translation into the clinic.

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In situ measurements on stability of long-period stacking-ordered structures in Mg85Y9Zn6 alloys during heating examined by multicolor synchrotron radiation small-angle scattering

Cited by 26 publications

References 14 publications

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

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

Stability of Long-Period Stacking Ordered Structures at Elevated Temperatures Examined by Multicolor Synchrotron Radiation X-ray Scattering/Diffraction Measurements

Utilizing Synchrotron Radiation for the Characterization of Biodegradable Magnesium Alloys—From Alloy Development to the Application as Implant Material

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In situ measurements on stability of long-period stacking-ordered structures in Mg85Y9Zn6 alloys during heating examined by multicolor synchrotron radiation small-angle scattering

Cited by 26 publications

References 14 publications

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

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

Stability of Long-Period Stacking Ordered Structures at Elevated Temperatures Examined by Multicolor Synchrotron Radiation X-ray Scattering/Diffraction Measurements

Utilizing Synchrotron Radiation for the Characterization of Biodegradable Magnesium Alloys—From Alloy Development to the Application as Implant Material

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Product

Resources

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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

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