Mechanical behavior of bulk metallic glass prepared by copper mold casting with reversed pressure

et al. 2023

Materials

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Mg-based metallic glass (MG) has attracted extensive attention in the field of wastewater treatment due to its high decolorization rate in degrading azo dyes. However, the azo dye degradation rate of Mg-based MGs is strongly dependent on the particle size. Improving the intrinsic degradation efficiency using large particles is of great interest for future applications. In this work, in-situ metallic glass matrix composites (MGMCs) with high Mg content were successfully prepared by melt spinning. It is found that when the Mg content is 79–82%, the as-spun sample shows typical glassy characteristics. The SEM and XRD tests confirm that the as-spun sample is composed of α-Mg dendrite, multiple Mg-Zn intermetallic particles and an MG matrix. The degradation experiment using Direct Blue 6 and a 500 μm particle sample demonstrate that the Mg82Zn14Ca3Sr1 MGMC sample degrades azo dyes faster than typical Mg-Zn-Ca MG alloy. It can be attributed to the galvanic cell effect on the α-Mg/MG interface, which reduces the waste of active Mg atoms in the MG matrix according to the corrosion protection mechanism by the α-Mg anode sacrifice. This result provides a new perspective and insight into the design of azo dye degradation alloys and the understanding of degradation mechanisms.

Section: Resultsmentioning

confidence: 99%

Fast Degradation of Azo Dyes by In Situ Mg-Zn-Ca-Sr Metallic Glass Matrix Composite

Jin

et al. 2023

Materials

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“…The rotating speed of the copper roller was set as 2000 and 8000 rpm, respectively (denoted as C1 and C2). In contrast, the casting obtained using a copper mold [29] with a diameter of 10 cm was denoted as alloy C0.…”

Section: Methodsmentioning

confidence: 99%

Effect of Cooling Rate on Microstructure and Grain Refining Behavior of In Situ CeB6/Al Composite Inoculant in Aluminum

Liu

Cui

et al. 2017

Metals

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Abstract:Melt spinning was performed to process an in situ CeB 6 /Al inoculant at different rotating speeds to investigate the influence of cooling rate on the grain refining behavior of inoculants. It has been found that a high cooling rate caused two obvious changes in the inoculant: the supersaturated solid solution of Ce in the α-Al matrix and the miniaturization of CeB 6 particles. At high cooling rates of~10 8 K/s, the Ce content is largely beyond the theoretical solid solubility of Ce in Al, and the size of the CeB 6 particles in ribbons is reduced to~100 nm. The grain refining effect of melt-spun CeB 6 /Al composite inoculant shows significant dependence on holding time of which the best value should be no more than 2 min. The excellent grain refinement of the inoculant can be attributed to the combined effect of the nano-sized refiner particles and the large undercooling caused by the sudden melting of supersaturated Al-Ce solution.

“…Subsequently, the Cu-coated SiC particles (Wrapped in aluminum foil) were added in the liquid with an addition amount of 5 wt % to fabricate the master alloy SiC/Mg 54 Cu 26.5 Ag 8.5 Gd 11 ingot under mechanically stirring. The master alloy was then re-melted by introduction melting, and cast into a copper mold to prepare a rod with a diameter of 3 mm and a length of 70 mm (so-called injection casting, the schematic diagram of the device has been described in detail elsewhere [ 27 , 28 ]).…”

Section: Methodsmentioning

confidence: 99%

Fabrication and Mechanical Behavior of Ex Situ Mg-Based Bulk Metallic Glass Matrix Composite Reinforced with Electroless Cu-Coated SiC Particles

Zhao

et al. 2017

Materials

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Magnesium-based bulk metallic glass matrix composites (BMGMCs) have better plasticity than the corresponding bulk metallic glasses (BMGs); however, their strength and density are often compromised due to the fact that the effective reinforcement phase is mostly plastic heavy metal. For lightweight SiC-particle reinforced BMGMCs, interface wettability and the sharpness of the particles often reduce the strengthening effect. In this work, SiC particles were coated with a thin Cu coating by electroless plating, and added to Mg54Cu26.5Ag8.5Gd11 melt in an amount of 5 wt % to prepare a BMGMC. The microstructure of the interface, mechanical behavior and fracture morphology of the BMGMC were studied by scanning electron microscopy and quasi-static compression testing. The results showed that the Cu coating improved the wettability between SiC and the matrix alloy without obvious interfacial reactions, leading to the dispersion of SiC particles in the matrix. The addition of Cu-coated SiC particles improved the plastic deformation ability of Mg54Cu26.5Ag8.5Gd11 BMG, proving that electroless plating was an effective method for controlling the interface microstructure and mechanical behavior of BMGMCs.