“…The coarse and lamellar eutectic Si phases are greatly refined while its morphology become granular, short rods and fibrous [ [15] , [16] , [17] ]. Ding et al [ 11 ] investigated TEM analysis twins on the eutectic Si in Al-7Si and discovered that the distribution of metamorphic elements Fig. 6 TEM and SEM images, and the corresponding SAED patterns, of the internal structure in the eutectic Si phase in the as-cast Al-20Si alloy with the addition of 0.2%Sr-0.15%Sc-0.3%La-UVT: (a) and (b) The bright-field (BF)-TEM image of the eutectic Si phase with a higher magnification; (c) and (d) BF-TEM image of the eutectic Si phase, indicating a high density of nanoprecipitates and low density of twins in the eutectic Si phase; (e) the corresponding SAED pattern of the samples in (c) and (f).…”
Section: Experiments Resultsmentioning
confidence: 99%
“…and accelerating the growth of the number of twins [ 11 ]. Nano-cluster particles of high density emerge within the eutectic Si, some of which are spread across the twinned strip.…”
Section: Experiments Resultsmentioning
confidence: 99%
“…La is a silvery-white reactive metal that can react directly with C, N, B, Se, Si, etc. Ding et al research [ 11 ] showed that the incorporation of Al-3Ti-4.35La could decrease the nucleation temperature of eutectic Si in Al-7Si, hasten the eutectic reaction time, impede its growth, and modify its form. Jiang et al [ 12 ] found that the eutectic Si was modified its morphology from strip to fiber or granular, and its average length is about 1.04 μm by adding 0.5% Mg-15La master alloy in the Al-11Si-2.5Cu-0.8Fe alloy.…”
“…The coarse and lamellar eutectic Si phases are greatly refined while its morphology become granular, short rods and fibrous [ [15] , [16] , [17] ]. Ding et al [ 11 ] investigated TEM analysis twins on the eutectic Si in Al-7Si and discovered that the distribution of metamorphic elements Fig. 6 TEM and SEM images, and the corresponding SAED patterns, of the internal structure in the eutectic Si phase in the as-cast Al-20Si alloy with the addition of 0.2%Sr-0.15%Sc-0.3%La-UVT: (a) and (b) The bright-field (BF)-TEM image of the eutectic Si phase with a higher magnification; (c) and (d) BF-TEM image of the eutectic Si phase, indicating a high density of nanoprecipitates and low density of twins in the eutectic Si phase; (e) the corresponding SAED pattern of the samples in (c) and (f).…”
Section: Experiments Resultsmentioning
confidence: 99%
“…and accelerating the growth of the number of twins [ 11 ]. Nano-cluster particles of high density emerge within the eutectic Si, some of which are spread across the twinned strip.…”
Section: Experiments Resultsmentioning
confidence: 99%
“…La is a silvery-white reactive metal that can react directly with C, N, B, Se, Si, etc. Ding et al research [ 11 ] showed that the incorporation of Al-3Ti-4.35La could decrease the nucleation temperature of eutectic Si in Al-7Si, hasten the eutectic reaction time, impede its growth, and modify its form. Jiang et al [ 12 ] found that the eutectic Si was modified its morphology from strip to fiber or granular, and its average length is about 1.04 μm by adding 0.5% Mg-15La master alloy in the Al-11Si-2.5Cu-0.8Fe alloy.…”
“…[6,7] Despite numerous attempts to modify the size and distribution of primary silicon particles in these alloys, yielding some success, [8][9][10][11] attention has also been directed toward enhancing the mechanical and wear properties of the more ductile hypoeutectic alloys. [12][13][14][15] For instance, Raveendranath, et al [16] investigated the tribological behavior of cast Al-7Si-0.3 Mg-3Ni hypoeutectic alloy and found that the wear rate decreased when the alloy heat treated at higher solutionizing temperature. A promising approach to achieve this is through the incorporation of hard and stiff reinforcements into the matrix of these alloys, transforming them into aluminum matrix composites (AMCs).…”
This study investigates the combined influence of Si element and reinforcing particles on the hardness and wear performance of aluminum matrix composites. The composites in focus include Fe‐based metallic glass (FMG) monolithic reinforced and FMG/SiC hybrid reinforced Al‐5 wt% Si matrix composites, fabricated through spark plasma sintering (SPS). A comprehensive investigation was carried out, encompassing the analysis of microstructural attributes and the examination of worn surfaces through field emission scanning electron microscopy. Additionally, the study scrutinized two pivotal factors—hardness and density—recognizing their pivotal roles in determining the tribological performance of these composites. The experimental findings demonstrated the presence of an oxide protective layer on the worn surfaces of all specimens. Although, FMG/SiC hybrid reinforced Al‐5 wt% Si matrix composite possessed the highest hardness value, the best tribological performance was observed in Si‐bearing monolithic reinforced composite. The addition of Si to the matrix of monolithic reinforced composite facilitated improved densification behavior and enhanced the distribution of reinforcing particles, resulting in a more stable and protective oxide layer in this specific sample. Furthermore, the study identified a transition in the operative wear mechanisms from delamination to mild abrasion and adhesion with the inclusion of Si element.This article is protected by copyright. All rights reserved.
“…Traditional casting techniques are mostly preferred in the production of commercial Al-Si alloys. In these techniques, Si phases are dispersed as blocks in the microstructure due to the slow cooling rate and this affects the mechanical properties of the alloy negatively [8]. It is known from the literature that the mechanical properties of Al-Si alloys are greatly increased by eliminating these problems with rapid solidification techniques [9].…”
In this study, Al-6Si-0.3Cu ribbon alloys produced by melt-spinning method were consolidated by two different methods, which are spark plasma sintering and cryogenic ball milling + cold compaction. From X-ray diffraction analysis, it was found that the solubility of Si in Al matrix in melt-spun alloys increased, but Si precipitated in SPS and ball milled+cold compacted alloys. Optical and scanning electron microscope observation revealed that while melt spun alloys have a very fine and homogenous microstructure, Si phase has become coarser in SPS and cold compacted alloys due to the sintering. The results showed that the spark plasma sintering method is a very effective method for compaction of melt-spun Al-6Si-0.3Cu alloy.
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