The Electronic Structural and Elastic Properties of Mg23Al30 Intermediate Phase under High Pressure

Sun, L.; Hui, Weihua; Zhou, Yong; Zhai, Wenyan; Dong, Hui; Liu, Yanming; Gao, Qian; Dang, Mohan; Peng, Jianhong

doi:10.3390/cryst10080642

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…For example, the ε phase was detected in the central region of the friction stir welding of AZ31 and 6061 aluminum alloys [17,18]. The formation of Mg 23 Al 30 phase should be avoided, since it is the main weakness in the welding strength of Mg-Al dissimilar metals, as stated by Sun et al [19]. The formation of ε-Mg 23 (Al, Zn) 30 phase, where Zn partially occupies the sublattice of Al in the binary Mg 23 Al 30 phase, was also detected by Wang et al [20] when studying the welding coating of Mg-Al x Zn 1-x alloys using the diffusion couple technique.…”

Section: Introductionmentioning

confidence: 95%

Experimental Investigation and Thermodynamic Verification for the Phase Relation around the ε-Mg23 (Al, Zn)30 Intermetallic Compound in the Mg-Zn-Al System

et al. 2021

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The appearance of the ε phase during the welding process can severely weaken the welding strength of dissimilar metals of Mg-Zn-Al alloy systems. An understanding of the accurate phase diagram, especially the equilibrium phase relation around the ε phase, is thus of particular importance. However, the phase interrelation near the ε-Mg23(Al, Zn)30 phase has not yet been fully studied. In this work, the local phase diagrams of the ε phase and its surrounding phases in the Mg-Zn-Al system are systematically determined by experimental investigation and thermodynamic verification. Five Mg-Zn-Al alloys and one diffusion couple were fabricated and analyzed to get accurate phase constituents and relationships adjacent to ε phase. The current experimental data obtained from Scanning Electron Microscope (SEM), X-ray diffraction (XRD), Differential Scanning Calorimetry (DSC), and Electron Probe Micro Analysis (EPMA) were further compared with the thermodynamically computed phase relations around ε phase for verification, showing good agreements. Several important conclusions are drawn based on current experimental work, which can provide supporting information for the follow-up studies on ε phase in the Mg-Zn-Al alloy systems.

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Section: Introductionmentioning

confidence: 95%

Experimental Investigation and Thermodynamic Verification for the Phase Relation around the ε-Mg23 (Al, Zn)30 Intermetallic Compound in the Mg-Zn-Al System

et al. 2021

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“…It is widely used in aviation, automotive, and electronics industries [1,2]. However, magnesium alloys have shortcomings in strength and heat resistance compared to steel, aluminum, and copper alloys, posing challenges in meeting higher strength requirements and limiting their widespread applications [3]. Therefore, solving the problem of improving the strength of magnesium alloys has become the most concerned issue, leading researchers to shift their attention to rare earth magnesium alloys [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Microstructures evolution, texture characteristics and mechanical properties of extruded Mg-9Gd-3Nd-1Zn-1Sn-0.5Zr alloy

Liu,

Yan,

Zhang

2024

Mater. Res. Express

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In this study, a comprehensive investigation was conducted to explore the microstructural evolution, texture characteristics, and mechanical properties of extruded Mg-9Gd-3Nd-1Zn-1Sn-0.5Zr alloys with varying extrusion ratios (ERs). Moreover, the high-temperature mechanical properties of the alloy and analyzed the corresponding fracture mechanisms were investigated. The findings unveiled a refinement in grain size and an improvement in homogeneity with increasing ER. Such refinement coincided with the disruption of coarse Mg5(Gd, Nd, Zn) eutectic phases, facilitating dynamic recrystallization. As a result, the extruded alloy manifested small grains, significant orientation difference in grain boundaries, and a weakened texture. In particular, the average grain size in the extrusion direction (ED) diminished to 13.29 μm (ER4), 9.62 μm (ER16), and 4.05 μm (ER25). And the ED texture of the ER4 alloy featured a strong (0001) basal bimodal pattern, whereas the ER16 and ER25 alloys showcased a random texture. Furthermore, the ER25 alloy displayed notable work hardening at temperatures of 200 °C or below, exerting a significant influence on its stress–strain curve. The ultimate tensile strength (UTS) of the alloy remained consistently above 275.09 MPa, demonstrating ductile fracture characteristics characterized by numerous dimples at temperatures of 200 °C or higher. The study identified the second phase as the primary contributor to enhancing the high-temperature tensile characteristics of the alloy. In summary, this research developed a unique high-strength Mg-9Gd-3Nd-1Zn-1Sn-0.5Zr alloy characterized by fine grain and texture strengthening. The alloy exhibited remarkable stability at temperatures of 250 °C or lower, making it a promising candidate for applications in high-temperature applications.

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Microstructure and characterization of Ti–Al explosive welding composite plate

Zhang

et al. 2022

Int J Adv Manuf Technol

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In order to study the interface characteristics and microstructure formation of Ti-Al composite plate, explosive welding was carried out with TA2 titanium as the fly plate and 5083 aluminums as the base plate. Optical microscope and electron microscope were used to analyze the microstructure of intermetallic compounds. SPH method was used to simulate the welding process of composite plates. The formation conditions and initial defects of intermetallic compounds were analyzed. The results show that most of the melted metal in the wave-front stays in the wave-waist region, and there was a relative velocity difference between the vortex and the titanium tissue, which led to the existence of small pieces of fragmentation. The outer layer of the vortex had higher velocity than the inner layer. The formation of Ti 3 Al, its antioxidant capacity wound lead to the formation of cracks. The temperature of outer vortex was higher than that of inner vortex, and the vortex has a transition layer of 5 μm, which is thinner than the transition layer of 8 μm between cladding plate and substrate. The jet was mostly composed of aluminum metal, and the interface jet velocity reaches 3000 m•s -1 and the interface temperature reaches up to 2100 K. Compared with the molten metal in the wave-back vortex, the jet temperature at the interface was higher, resulting in a thicker transition layer at the bonding surface. The residual stress at the interface wound cause the density of the material to increase.

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The Electronic Structural and Elastic Properties of Mg23Al30 Intermediate Phase under High Pressure

Cited by 5 publications

References 29 publications

Experimental Investigation and Thermodynamic Verification for the Phase Relation around the ε-Mg23 (Al, Zn)30 Intermetallic Compound in the Mg-Zn-Al System

Experimental Investigation and Thermodynamic Verification for the Phase Relation around the ε-Mg23 (Al, Zn)30 Intermetallic Compound in the Mg-Zn-Al System

Microstructures evolution, texture characteristics and mechanical properties of extruded Mg-9Gd-3Nd-1Zn-1Sn-0.5Zr alloy

Microstructure and characterization of Ti–Al explosive welding composite plate

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