Effect of particle size ratio on microstructure and mechanical properties of aluminum matrix composites reinforced with Zr48Cu36Ag8Al8 metallic glass particles
“…Higher relative densities were obtained at higher sintering temperatures for all samples. This can be related to the significant effect of temperature on atomic diffusion, which can be explained by equation (1) 33 where D is the diffusion coefficient, D 0 is a constant, Q is the activation energy, R is Boltzmann’s constant, and T is the temperature.Figure 3.The porosity content of the sintered samples at different temperatures.…”
Section: Resultsmentioning
confidence: 99%
“…In recent decades, enormous efforts have been made to fabricate aluminum matrix composites to meet the growing demands for lightweight construction and high mechanical properties in various industries such as automotive and aerospace. [1][2][3] The reinforcement of the aluminum matrix with second-phase particles such as ceramics, 4,5 carbon materials, 6,7 and metallic glasses 8,9 improves the physical and mechanical properties of composites. Nevertheless, each of the aforementioned reinforcements adversely affects the properties of the composites to some extent.…”
In this investigation, hybrid aluminum matrix composites reinforced with Fe-based metallic glass (FMG) and SiC particles were synthesized using spark plasma sintering (SPS) at different sintering temperatures. The effects of sintering temperature on densification, phases, microstructure, and mechanical properties of the composites were evaluated. The findings indicate that the density of the sintered samples improved with increasing the sintering temperature. The X-ray diffraction results showed no remarkable difference in the phases of the samples sintered at different temperatures; only some small structural changes occurred in the metallic glass reinforcements. The sintering temperature had a significant effect on mechanical properties. For example, the hybrid aluminum matrix composite reinforced with 3 vol% FMG and 7 vol% SiC sintered at 550°C exhibited the ultimate compressive strength of 494 MPa, which is about 47% higher than the same composite sintered at 450°C.
“…Higher relative densities were obtained at higher sintering temperatures for all samples. This can be related to the significant effect of temperature on atomic diffusion, which can be explained by equation (1) 33 where D is the diffusion coefficient, D 0 is a constant, Q is the activation energy, R is Boltzmann’s constant, and T is the temperature.Figure 3.The porosity content of the sintered samples at different temperatures.…”
Section: Resultsmentioning
confidence: 99%
“…In recent decades, enormous efforts have been made to fabricate aluminum matrix composites to meet the growing demands for lightweight construction and high mechanical properties in various industries such as automotive and aerospace. [1][2][3] The reinforcement of the aluminum matrix with second-phase particles such as ceramics, 4,5 carbon materials, 6,7 and metallic glasses 8,9 improves the physical and mechanical properties of composites. Nevertheless, each of the aforementioned reinforcements adversely affects the properties of the composites to some extent.…”
In this investigation, hybrid aluminum matrix composites reinforced with Fe-based metallic glass (FMG) and SiC particles were synthesized using spark plasma sintering (SPS) at different sintering temperatures. The effects of sintering temperature on densification, phases, microstructure, and mechanical properties of the composites were evaluated. The findings indicate that the density of the sintered samples improved with increasing the sintering temperature. The X-ray diffraction results showed no remarkable difference in the phases of the samples sintered at different temperatures; only some small structural changes occurred in the metallic glass reinforcements. The sintering temperature had a significant effect on mechanical properties. For example, the hybrid aluminum matrix composite reinforced with 3 vol% FMG and 7 vol% SiC sintered at 550°C exhibited the ultimate compressive strength of 494 MPa, which is about 47% higher than the same composite sintered at 450°C.
“…A decrease in viscosity can be used to advantage for obtaining dense aluminum matrix composites by powder consolidation, the metallic glass acting as both a binder and a reinforcing component [15]. Al-metallic glass composites have been obtained by hot rolling [16,17], hot pressing [18], hot extrusion [19], induction heating [15], hot pressing and subsequent hot extrusion [20,21], and spark plasma sintering (SPS) [22][23][24]. It is assumed that the application of external pressure helps deform the glassy particles and break the oxide films on the surfaces of the aluminum particles.…”
In metallic glass-reinforced metal matrix composites, the glassy phase can serve a dual purpose: (i) it can behave as soft binder and porosity remover during consolidation; and (ii) it can act as the hard reinforcing phase after densification. The present work aimed to demonstrate the benefit of the glassy reinforcing particles for the densification of aluminum matrix composites. The consolidation behavior of Al–50 vol.% Fe-based alloy mixtures prepared using a glassy Fe66Cr10Nb5B19 alloy powder (Tg = 521 °C, Tx = 573 °C) or a crystalline Fe62Cr10Nb12B16 alloy powder was studied under spark plasma sintering (SPS) and hot pressing (HP) conditions. The powders were consolidated by heating above the glass transition temperature of the glassy alloy (up to 540 °C in SPS and 570 °C in HP). When the coarse aluminum powder was used, the reinforcing particles formed chains within the microstructure. In composites formed from the fine Al powder, the particles of the Fe-based alloy were separated from each other by the metallic matrix, and the tendency to form agglomerates was reduced. The glassy state of the alloy was shown to be beneficial for densification, as the metallic glass acted as a soft binder. The densification enhancement effect was more pronounced in the case of reinforcing particles forming chains. The hardness of the Al–50 vol.% glassy Fe66Cr10Nb5B19 composites obtained by SPS was twice the hardness of the unreinforced sintered aluminum (110 HV1 versus 45 HV1).
“…Reinforcing aluminum and its alloys with metallic glass inclusions is among the modern trends in the development of aluminum matrix composites [14][15][16][17][18][19][20][21][22][23][24][25]. An approach to consolidation of metallic glass-reinforced MMCs based on the advantages given by the viscous flow of metallic glass in the supercooled liquid region was elaborated [3][4][5]: the consolidation temperature is to be selected within the supercooled liquid region.…”
In the area of metal matrix composites, novel reinforcing options are currently being evaluated. Particles of amorphous alloys present an interesting possibility to reinforce soft metals. In the present work, the interaction between Fe66Cr10Nb5B19 metallic glass and aluminum during Spark Plasma Sintering (SPS) was studied for the first time. In order to trace the phase and microstructural changes upon sintering, mixtures containing 20 vol.% and 50 vol.% of metallic glass were subjected to SPS at 500-570 ºC. After SPS at 500 ºC, no reaction layer between the metallic glass particles and aluminum was observed. After SPS at 570 ºC, a reaction layer containing Fe2Al5 and FeAl3 formed around the Fe-based cores. The Vickers hardness of composites obtained from mixtures containing 20 vol. % Fe66Cr10Nb5B19 at 540 ºC was 75 HV and increased to 280 HV after sintering at 570 ºC due to the formation of thicker reaction layers at the interface.The hardness of the composite sintered from the mixture containing 20 vol. % Fe66Cr10Nb5B19 at 570 ºC was between the values predicted by Reuss and Voigt models.Comparison of results of SPS of the powder mixtures with those of SPS of a precompacted pellet and electric current-free annealing suggests that local heating at the interface caused by interfacial resistance may be an important factor influencing the reaction advancement at the interface and the formation of Al-containing intermetallics.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
