Effect of SiC nanoparticles on manufacturing process, microstructure and hardness of Mg-SiC nanocomposites produced by mechanical milling and hot extrusion

Penther, Daniela; Ghasemi, Alireza; Riedel, Ralf; Fleck, Claudia; Kamrani, Sepideh

doi:10.1016/j.msea.2018.09.106

Cited by 38 publications

(24 citation statements)

References 28 publications

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“…Mg nanocomposites were processed according to the protocols described in detail previously [17,18,19]. In a nutshell, Mg powder with an average particle size of −325 mesh and nano- and submicron-sized SiC particles with an average particle size of 50 nm and ˂1 µm, respectively, (both Alfa Aesar, Ward Hill, MA, USA) were used.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, milled powders consolidated by conventional compaction methods, such as uniaxial pressing and sintering, usually revealed a high level of porosity and more irregular pores with a broad pore size distribution, especially for high volume fractions of reinforcing particles [16]. By a well-defined processing strategy, where we combined mechanical milling of composite powders with adapted consolidation steps comprising a sequence of isostatic cold pressing, sintering, and hot extrusion, we recently managed to produce Mg matrix nanocomposites with a uniform distribution of SiC nanoparticles up to a high volume fraction of 10 vol % of the reinforcing phase and with a very high relative density of up to 99.9% [17].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Strength and Ductility in Magnesium Matrix Composites Reinforced by a High Volume Fraction of Nano- and Submicron-Sized SiC Particles Produced by Mechanical Milling and Hot Extrusion

et al. 2019

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In the present study, Mg nanocomposites with a high volume fraction (10 vol %) of SiC particles were fabricated by two approaches: mechanical milling and mixing, followed by the powder consolidation steps, including isostatic cold pressing, sintering, and extrusion. A uniform distribution of the high content SiC particles in a fully dense Mg matrix with ultrafine microstructure was successfully achieved in the mechanically milled composites. The effect of nano- and submicron-sized SiC particles on the microstructure and mechanical properties of the nanocomposites was evaluated. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectrometer (EDS), and X-ray diffractometry (XRD) were used to characterize microstructures of the milled and mixed composites. Mechanical behavior of the Mg composites was studied under nanoindentation and compressive loading to understand the effects the microstructural modification on the strength and ductility of the Mg/SiC composites. The mechanical properties of the composites showed a significant difference regarding the size and distribution of SiC particles in the Mg matrix. The enhanced strength and superior ductility achieved in the mechanically milled Mg composites are mainly ascribed to the effective load transfer between matrix and SiC particles, grain refinement of the matrix, and strengthening effects of the nano- and submicron-sized SiC particles.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced Strength and Ductility in Magnesium Matrix Composites Reinforced by a High Volume Fraction of Nano- and Submicron-Sized SiC Particles Produced by Mechanical Milling and Hot Extrusion

et al. 2019

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“…The calculated transmittance of a sample of 10 mm diameter is 18% at 11 keV, so a good contrast in absorption mode is expected. As a test sample for Zernike phase contrast, we used a lowabsorbing magnesium composite with 10 vol% SiC particles of sub-micrometre size (Penther et al, 2018;Ghasemi et al, 2018). This allowed testing the resolution by analyzing larger particles and smaller particles.…”

Section: Methodsmentioning

confidence: 99%

“…This material has been proven to be well suited as a test object for evaluating TXM performance before (Larsson et al, 2019). For the Zernike phase contrast we chose a low-Z phase object with nano-sized grains, namely a magnesium alloy (Ghasemi et al, 2018;Penther et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Pushing the temporal resolution in absorption and Zernike phase contrast nanotomography: enabling fast in situ experiments

et al. 2020

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Hard X-ray nanotomography enables 3D investigations of a wide range of samples with high resolution (<100 nm) with both synchrotron-based and laboratory-based setups. However, the advantage of synchrotron-based setups is the high flux, enabling time resolution, which cannot be achieved at laboratory sources. Here, the nanotomography setup at the imaging beamline P05 at PETRA III is presented, which offers high time resolution not only in absorption but for the first time also in Zernike phase contrast. Two test samples are used to evaluate the image quality in both contrast modalities based on the quantitative analysis of contrast-to-noise ratio (CNR) and spatial resolution. High-quality scans can be recorded in 15 min and fast scans down to 3 min are also possible without significant loss of image quality. At scan times well below 3 min, the CNR values decrease significantly and classical image-filtering techniques reach their limitation. A machine-learning approach shows promising results, enabling acquisition of a full tomography in only 6 s. Overall, the transmission X-ray microscopy instrument offers high temporal resolution in absorption and Zernike phase contrast, enabling in situ experiments at the beamline.

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“…Reportedly, the nanoparticles pin the grain boundaries and trigger dynamic recrystallization of the Mg matrix. 9 As mentioned above, the related studies on the use of B 4 C as a reinforcing agent, generally involve minor weight fractions of reinforcement material. The present research, on the other hand, aims to examine the addition of a relatively higher weight fraction (50 %) and to provide a further insight into the hot-pressed AZ91-B 4 C combination on which a scarce number of studies have been encountered, despite their wide applicability in fabrication of composites.…”

Section: Introductionmentioning

confidence: 99%

Effect of B4C addition on the microstructure, hardness and dry-sliding-wear performance of AZ91 composites produced with hot pressing

Öge¹,

Öge²,

Yılmaz³

et al. 2019

Mater. Tehnol.

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AZ91-B4C composites were fabricated with varying reinforcement ratios (5 w/%, 10 w/%, 20 w/% and 50 w/% B4C) via powder metallurgy and hot pressing to examine their microstructure, hardness and dry-sliding-wear performance. Powder compositions were verified with XRD and the microstructure of the sintered composites was evaluated using SEM (Scanning Electron Microscope) and EDS analyses. Hardness measurements and dry-sliding-wear tests were performed to evaluate the effect of reinforcement addition on the hardness and wear performance of the fabricated composites. Hot pressing of the composite with 50 w/% B4C required a significantly higher sintering pressure at the same sintering temperature. Increasing the B4C addition resulted in increased hardness values for all the composites, whereas the lowest worn volume and coefficient of friction were obtained with 10 w/% B4C.

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Effect of SiC nanoparticles on manufacturing process, microstructure and hardness of Mg-SiC nanocomposites produced by mechanical milling and hot extrusion

Cited by 38 publications

References 28 publications

Enhanced Strength and Ductility in Magnesium Matrix Composites Reinforced by a High Volume Fraction of Nano- and Submicron-Sized SiC Particles Produced by Mechanical Milling and Hot Extrusion

Enhanced Strength and Ductility in Magnesium Matrix Composites Reinforced by a High Volume Fraction of Nano- and Submicron-Sized SiC Particles Produced by Mechanical Milling and Hot Extrusion

Pushing the temporal resolution in absorption and Zernike phase contrast nanotomography: enabling fast in situ experiments

Effect of B4C addition on the microstructure, hardness and dry-sliding-wear performance of AZ91 composites produced with hot pressing

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