Research status and prospects of melt refining and purification technology of magnesium alloys

Cao, Hong‐Tao; Huang, Mengtao; Wang, Yuming; Liu, Siyuan; Zha, Jili; You, Guoxiang

doi:10.1016/j.jma.2019.07.002

Cited by 46 publications

(9 citation statements)

References 25 publications

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“…Generally, there are three ways to improve the wear resistance and corrosion resistance of magnesium alloys: (1) Improving the microstructure and manufacturing process of the alloy [5][6][7][8]; (2) Preparing a protective layer on their surface [9][10][11][12][13][14]; (3) Designing or adjusting the application environment of magnesium alloys. Among them, thermal spraying on the surface of magnesium alloys is a relatively mature process [15][16][17][18], but it will inevitably cause significant adverse effects to the magnesium alloys substrate. In recent years, the development of cold spray technology has provided a possibility for the comprehensive improvement of the surface properties of magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Cold Sprayed NiCrAl Coating on AZ91D Magnesium Alloy

Zhao

Dong

et al. 2021

Coatings

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Herein, a NiCrAl coating was prepared on the AZ91D magnesium alloy by cold spraying technology. The microstructure, wear resistance, and corrosion resistance of the cold sprayed NiCrAl coating were studied and compared with two NiCrAl coatings prepared by plasma spraying. The results showed that the porosity of the two-plasma sprayed NiCrAl coatings was 3.21% and 2.66%, respectively, while that of the cold sprayed NiCrAl coating was only 0.68%. The hardness of the cold sprayed NiCrAl coating (650 HV0.1) was higher than those of the two-plasma sprayed NiCrAl coatings (300 HV0.1, 400 HV0.1). In the abrasion resistance test, the cold sprayed NiCrAl coating showed a lower friction coefficient (0.346), less wear volume (3.026 mm3), and superior wear resistance accordingly compared with the two-plasma sprayed NiCrAl coatings. Moreover, the scanning electron microscopy (SEM) morphology at the bottom of the wear trace of the cold sprayed NiCrAl coating showed a compact mechanically mixed layers (MML) structure, and its wear mechanism was mainly abrasive wear, with some fatigue wear. In the electrochemical test, the corrosion current density of the cold sprayed NiCrAl coating (4.404 × 10−2 A·cm−2) was much lower than those of two plasma sprayed coatings (25.96 A·cm−2, 26.98 A·cm−2), indicating that the cold sprayed NiCrAl coating had superior corrosion resistance. Therefore, preparing a cold sprayed NiCrAl coating is a feasible method to comprehensively improve the wear resistance and corrosion resistance of the AZ91D magnesium alloy.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Cold Sprayed NiCrAl Coating on AZ91D Magnesium Alloy

Zhao

Dong

et al. 2021

Coatings

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“…Ultrasonic treatment significantly impairs the cast quality, which surface (Figure 2e) consists of many spherical pores and elongated inhomogeneities. Ultrasonic treatment improves the cast quality [44] and protects the melt with argon; however, an additional volume of gases is captured during melt mixing, which increases the alloy porosity up to 9 vol % and causes defects up to 400 μm long (Figure 2e). Ultrasonic treatment of the melt led to the loss of a larger amount of calcium, and its content in the alloy decreased to 0.46 wt %.…”

Section: Resultsmentioning

confidence: 99%

Study of the Effect of Diamond Nanoparticles on the Structure and Mechanical Properties of the Medical Mg–Ca–Zn Magnesium Alloy

Khrustalyov

Akhmadieva

Monogenov

et al. 2022

Metals

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The paper addresses the production and investigation of the Mg–Ca–Zn alloy dispersion-hardened by diamond nanoparticles. Structural studies have shown that diamond nanoparticles have a modifying effect and make it possible to reduce the average grain size of the magnesium alloy. Reduction of the grain size and introduction of particles into the magnesium matrix increased the yield strength, tensile strength, and ductility of the magnesium alloy as compared to the original alloy after vibration and ultrasonic treatment. The magnesium alloy containing diamond nanoparticles showed the most uniform fracture due to a more uniform deformation of the alloy with particles, which simultaneously increased its strength and ductility.

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“…However, the content of MgO particles in the bottom ingot was the least, and the microhardness was greater than that in the center ingot. This was mainly due to the large amount of impurity phases in the bottom ingot, and these impurity phases include MgO and mixtures (including Al, Fe and Si) 40 . Figure 6b was a typical strain strengthening curve.…”

Section: Effect Of Mgo On Mechanical Propertiesmentioning

confidence: 99%

Effect of MgO Content on Mechanical Properties of Directionally Solidified Pure Magnesium

2021

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The pure magnesium was fabricated by directional solidification, and the effect of the distribution characteristics of magnesium oxide (MgO) on the mechanical properties of pure magnesium was investigated. The statistical results showed that the area fraction, number and size of MgO were decreased gradually from the top region ingot to the bottom region ingot, and these reflected the advantages of directional solidification technology in the controllability of MgO distribution characteristics. The top parts of magnesium ingots have the highest tensile strength (44 MPa), which is mainly due to the presence of a large amount of the coarse MgO. Though the coarse MgO increases the strength obviously, it has harm for the ductility of magnesium. The top parts of magnesium ingots have higher ultimate tensile strength, but lower failure strain (13% and-21% respectively) than the ingot at the center. These results indicate that if the suitable size and amount of MgO existed in magnesium matrix, it could avoid the disadvantages of MgO and provide positive effect for both the strength and ductility of magnesium alloys.

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Research status and prospects of melt refining and purification technology of magnesium alloys

Cited by 46 publications

References 25 publications

Microstructure and Properties of Cold Sprayed NiCrAl Coating on AZ91D Magnesium Alloy

Microstructure and Properties of Cold Sprayed NiCrAl Coating on AZ91D Magnesium Alloy

Study of the Effect of Diamond Nanoparticles on the Structure and Mechanical Properties of the Medical Mg–Ca–Zn Magnesium Alloy

Effect of MgO Content on Mechanical Properties of Directionally Solidified Pure Magnesium

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