The microstructure of the surface layer of magnesium laser alloyed with aluminum and silicon

Dziadoń, A.; Mola, R.; Błaż, L.

doi:10.1016/j.matchar.2016.06.034

Cited by 23 publications

(6 citation statements)

References 27 publications

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“…3a was precipitated from Al 12 Mg 17 in a later stage of crystallization. The morphology of the proeutectic phase in this study is also similar to that in the cladded coating using Al-Si powders [10].…”

Section: Sem Microstructures and Eds Analysissupporting

confidence: 71%

“…The cladding powders applied on Mg substrate generally are classified as five types: binary metal powders such as Al-Cu [7], Al-Si [8][9][10], and Al-Sn [11]; ternary metal powders like Ni-Cu-Al [12], Ni-Zr-Al [13], and Ti-Ni-Al [14]; single pure ceramic powders like SiC [15], Al 2 O 3 [16] which are in general processed by plasma-spraying followed by laser cladding; mixture powders used to in-situ synthesize ceramic reinforced particle such as Al-Zr-B 4 C [17], Al-Ti-B 4 C [18]; mixture powders of metal and ceramic particle like Al-Al 2 O 3 [19], Al-SiC [20,21], and Al-Al 2 O 3 [22]. Composite coatings in which ceramic particles with a certain size are added directly may improve hardness and wear resistance and corrosion resistance of the coating.…”

Section: Introductionmentioning

confidence: 99%

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Al-WC composite coating on AZ91D Mg alloy by low power pulsed laser cladding

Zhang¹,

Li²,

Liu³

et al. 2020

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Laser cladding coatings were fabricated on AZ91D magnesium alloy using Al and WC powders with a weight percentage ratio of 95 : 5, 90 : 10, and 85 : 15 by a low power pulsed Nd:YAG laser. During the process of laser cladding, most of WC was decomposed. Tiny white granular resultant Al18Mg3W2 was detected in all coatings, while bright white Al4W particles with clustering tendency were found only in the 10 and 15 wt.% WC coatings because of relatively high WC content. α-Al, α-Mg, Al3Mg2, and Al12Mg17 were also detected at the coatings. The hardness of the coatings increased by 3-4 times compared with that of the substrate. The corrosion resistance of the coatings was also improved markedly, mainly the passivation phenomenon was observed in all coatings, which may benefit from the formation of oxidation film Al2O3 • H2O on the surface of the coatings due to high Al concentration.

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Section: Sem Microstructures and Eds Analysissupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Al-WC composite coating on AZ91D Mg alloy by low power pulsed laser cladding

Zhang¹,

Li²,

Liu³

et al. 2020

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“…The primary Si particles and the eutectic Si particles present in the AlSi17 alloy reacted with the Mg, which led to the formation of an Mg2Si intermetallic phase in the bonding zone. The results provided in [24] show that the heating of the AlSi20/Mg couple at 430 o C caused the formation of a transition layer at the AlSi20/Mg interface containing an Mg2Si phase, which is a product of the reaction between the Mg and the primary Si grains. Asano and Yoneda [25] also confirm the in-situ formation of Mg2Si particles in the surface layer of the AZ91D as a result of casting magnesium alloy melt into a mould coated with a slurry containing Si particles.…”

Section: Resultsmentioning

confidence: 94%

Microstructure of the Bonding Zone Between AZ91 and AlSi17 Formed by Compound Casting

Mola

Bucki

Dziadoń

2017

Archives of Foundry Engineering

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This paper discusses the joining of AZ91 magnesium alloy with AlSi17 aluminium alloy by compound casting. Molten AZ91 was cast at 650 o C onto a solid AlSi17 insert placed in a steel mould under normal atmospheric conditions. Before casting, the mould with the insert inside was heated up to about 370 o C. The bonding zone forming between the two alloys because of diffusion had a multiphase structure and a thickness of about 200 µm. The microstructure and composition of the bonding zone were analysed using optical microscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. The results indicate that the bonding zone adjacent to the AlSi17 alloy was composed of an Al3Mg2 intermetallic phase with not fully consumed primary Si particles, surrounded by a rim of an Mg2Si intermetallic phase and fine Mg2Si particles. The bonding zone near the AZ91 alloy was composed of a eutectic (an Mg17Al12 intermetallic phase and a solid solution of Al and Si in Mg). It was also found that the compound casting process slightly affected the AZ91alloy microstructure; a thin layer adjacent to the bonding zone of the alloy was enriched with aluminium.

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“…Because magnesium alloys have very low corrosion resistance, the surface layer of such parts is mechanically covered with a layer of aluminum alloys, which are much more resistant to corrosion. As a result, a low weight part with increased corrosion resistance is produced [14]. Another area of application of bimetallic materials is the manufacture of various types of cutting tools in which the working part is made of tool materials characterized by very high strength properties, and the gripping part is made of much cheaper general-use construction materials [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Skew Rolling of Bimetallic Rods

et al. 2020

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The present article reports selected results of a preliminary study of the process of skew rolling of bimetallic rods. The experiments were conducted using a numerically controlled three-roller skew rolling mill. During the tests, bimetallic rods were rolled from billets whose cores and outer sleeves (bushings) were made of different types of steel. The results demonstrate that the proposed method can be successfully used in the production of bimetallic rods. However, proper fastening of the two materials depends on the geometrical parameters of the billets, and the quality of bimetallic rods depends on the heating method used. When the rods are heated without protective atmospheres, the surface layer of the core gets decarburized and the surfaces of the materials being joined together are oxidized, which hinders the welding process and adversely affects the physical and chemical properties of such products. The results of numerical modeling indicate that the material near the surface tends to flow, which may have a negative impact on the welding process. In addition, the distribution of stress in the tool–workpiece contact zone may make welding of the materials difficult. The results reported in this paper are preliminary and constitute a prelude to a more detailed analysis of bimetallic rod rolling.

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The microstructure of the surface layer of magnesium laser alloyed with aluminum and silicon

Cited by 23 publications

References 27 publications

Al-WC composite coating on AZ91D Mg alloy by low power pulsed laser cladding

Al-WC composite coating on AZ91D Mg alloy by low power pulsed laser cladding

Microstructure of the Bonding Zone Between AZ91 and AlSi17 Formed by Compound Casting

Skew Rolling of Bimetallic Rods

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