Bonding effect of liquid magnesium with open-celled carbon foam in interpenetrating phase composite

Godzierz, Marcin; Olszówka-Myalska, A.; Sobczak, N.; Nowak, R.; Wrześniowski, Patryk

doi:10.1016/j.jma.2020.06.006

Cited by 11 publications

(3 citation statements)

References 52 publications

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“…Figure 2 , Figure 3 and Figure 4 show SEM and EDS images from the obtained composites which revealed continuous bonding between foams and matrices and confirmed well-known structural effects typical for C–Mg systems that depend on matrix composition. The oxygen concentration increased at the foam–metal interface due to the formation of oxide type bonding ( Figure 2 c, Figure 3 c and Figure 4 c) [ 45 ]. Additionally, the aluminum concentration increased in that region for AZ31, as a result of Mg 17 Al 12 phase accumulation, oxide phases and Al 4 C 3 carbide formation.…”

Section: Resultsmentioning

confidence: 99%

Impact of Carbon Foam Cell Sizes on the Microstructure and Properties of Pressure Infiltrated Magnesium Matrix Composites

2020

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Magnesium-based composites reinforced with open-celled carbon foams (Cof) of porosity approx. 97 vol % and three cell sizes (20, 45 and 100 ppi) were examined to characterize the influence of foam cell size on the microstructure and properties when pure magnesium and two cast alloys AZ31 and RZ5 were used as matrices. All composites were fabricated by pressure infiltration under the same conditions (temperature, pressure, time). For each matrix composition, two main factors due to the presence of the foam determined the composite microstructure—the efficiency of foam penetration and different conditions of metal crystallization. The lowest porosity was obtained when Cof45ppi was used and was independent of the applied matrix composition. The metallic component microhardness increased with a decrease in the carbon cell size as well as a decrease in the α-Mg grain size; both of those results should be taken into account during theoretical calculations. Compression and three-point bending strength measurements showed increases as the carbon cell size decreased, but reinforcing effectiveness relative to the matrix material depended on the metal matrix composition. At the fractured surface, different structural effects in the foam and matrix as well as at the interface were observed and depended on the foam geometry, metal composition and mechanical test type. In glassy carbon foam, those effects occurred as cracking across walls, fragmentation, and delamination, while in the matrix, shear bands and intergranular cracking were observed. On the delaminated foam surface, the microareas of a thin oxide layer were detected as well as dispersed phases characteristic for the applied matrix alloys. The accumulation of intermetallic phases was also observed on the metal matrix surface in microareas delaminated from the carbon foams. Mechanical property results indicated that among the tested, open-celled, carbon foams a 45 ppi porosity was the most useful for pressure infiltration and independent of magnesium-based matrix composition.

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Section: Resultsmentioning

confidence: 99%

Impact of Carbon Foam Cell Sizes on the Microstructure and Properties of Pressure Infiltrated Magnesium Matrix Composites

2020

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“…The main challenge in synthesising CNT containing Mg-based MMCs is creating stronger interfacial bonds between CNTs and Mg matrix, avoiding further wasting CNTs during processing, and reducing agglomerated particles leading to uniform CNTs dispersion in the matrix [24,25]. To overcome these obstacles, great attempts have been made by the use of different fabrication routes, such as powder metallurgy [26], pressureless infiltration [27], stir casting, and squeeze casting [2,20].…”

Section: Introductionmentioning

confidence: 99%

Tensile and wear properties of as-cast and extruded AZ91-xCNT and AZ91-1B₄C-1SiC-xCNT composites

Goodarzi

Emamy

Malekan

2023

Materials Science and Technology

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Tensile and wear properties of as-cast and extruded AZ91-xCNTs and AZ91-1%B4C-1%SiC-xCNT (x:0.25,0.5,1wt.%) composites were studied. Compared to as-cast AZ91 matrix alloy, hot extruded AZ91-0.25%CNT showed a significant enhancement in UTS (385 MPa) and elongation (16%), with no substantial improvement in wear properties however, the AZ91-xCNT composites containing micron-sized 1%B4C and 1%SiC particles met the lower tensile properties. Interesting wear behaviour was obtained after adding 1wt.%B4C and 1wt.%SiC to AZ91-xCNT where improvement in wear results was considerable. Development in wear properties of the AZ91-1%B4C-1%SiC-xCNT composites can be attributed to the enhanced hardness and reduced coefficient of friction. Wear analyses of two composites exhibited various wear mechanisms, but the abrasion mechanism dominated after CNT addition and hot extrusion at 20 N load.

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“…The primary problem for all systems (i.e., ceramic–ceramic, metal–metal, and ceramic–metal) using these methods is the proper selection of sintering conditions to ensure low porosity and strong bonding between powder grains. Open-celled foam or other open-network substrates have been filled by liquid metal using pressure infiltration [ 39 , 40 , 41 , 42 , 43 ] and centrifugal casting [ 44 ] or by the vibro-compaction of metal powder-foam systems and additional sintering under pressure [ 45 ]. The main technological challenges for these technologies are ensuring strong bonding between components and low composite porosity.…”

Section: Introductionmentioning

confidence: 99%

Application of Nanosilicon to the Sintering of Mg-Mg2Si Interpenetrating Phases Composite

et al. 2021

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The new in situ fabrication process for Mg-Mg2Si composites composed of interpenetrating metal/intermetallic phases via powder metallurgy was characterized. To obtain the designed composite microstructure, variable nanosilicon ((n)Si) (i.e., 2, 4, and 6 vol.% (n)Si) concentrations were mixed with magnesium powders. The mixture was ordered using a sonic method. The powder mixture morphologies were characterized using scanning electron microscopy (SEM), and heating and cooling-induced thermal effects were characterized using differential scanning calorimetry (DSC). Composite sinters were fabricated by hot-pressing the powders under a vacuum of 2.8 Pa. Shifts in the sintering temperature resulted in two observable microstructures: (1) the presence of Mg2Si and MgO intermetallic phases in α-Mg (580 °C); and (2) Mg2Si intermetallic phases in the α-Mg matrix enriched with bands of refined MgO (640 °C). Materials were characterized by light microscopy (LM) with quantitative metallography, X-ray diffraction (XRD), open porosity measurements, hardness testing, microhardness testing, and nanoindentation. The results revealed that (n)Si in applied sintering conditions ensured the formation of globular and very fine Mg2Si particles. The particles bonded with each other to form an intermetallic network. The volume fraction of this network increased with (n)Si concentration but was dependent on sintering temperature. Increasing sintering temperature intensified magnesium vaporization, affecting the composite formation mechanism and increasing the volume fraction of silicide.

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Bonding effect of liquid magnesium with open-celled carbon foam in interpenetrating phase composite

Cited by 11 publications

References 52 publications

Impact of Carbon Foam Cell Sizes on the Microstructure and Properties of Pressure Infiltrated Magnesium Matrix Composites

Impact of Carbon Foam Cell Sizes on the Microstructure and Properties of Pressure Infiltrated Magnesium Matrix Composites

Tensile and wear properties of as-cast and extruded AZ91-xCNT and AZ91-1B₄C-1SiC-xCNT composites

Application of Nanosilicon to the Sintering of Mg-Mg2Si Interpenetrating Phases Composite

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Bonding effect of liquid magnesium with open-celled carbon foam in interpenetrating phase composite

Cited by 11 publications

References 52 publications

Impact of Carbon Foam Cell Sizes on the Microstructure and Properties of Pressure Infiltrated Magnesium Matrix Composites

Impact of Carbon Foam Cell Sizes on the Microstructure and Properties of Pressure Infiltrated Magnesium Matrix Composites

Tensile and wear properties of as-cast and extruded AZ91-xCNT and AZ91-1B4C-1SiC-xCNT composites

Application of Nanosilicon to the Sintering of Mg-Mg2Si Interpenetrating Phases Composite

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Tensile and wear properties of as-cast and extruded AZ91-xCNT and AZ91-1B₄C-1SiC-xCNT composites