Particulate migration behavior and its mechanism during selective laser melting of TiC reinforced Al matrix nanocomposites

Yuan, Pengpeng; Gu, Dongdong; Dai, Donghua

doi:10.1016/j.matdes.2015.05.041

Cited by 157 publications

(43 citation statements)

References 24 publications

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“…It has been reported that the convection pattern of the fluid flow during the laser melting process is directed radially outward with the formation of symmetric vortices on the cross-section of the melt pool. 52 Such through mixing of the melt pool facilitates Ti to be in contact with Al and the high degree of constitutional undercooling results in the formation of a supersaturated solid solution of both Ti and Si in Al (Al SS-Si-Ti ) as demonstrated in Fig. 7.…”

Section: B Mechanical and Tribological Propertiesmentioning

confidence: 99%

“…Hence, the present work focuses on the production of Al-12Si-Ti 52 37 However, there is no melting involved in the powder metallurgy process; the phases observed should be significantly different and in turn the mechanical properties. The structural and microstructural aspects of the composites produced by SLM are analyzed in detail and are compared with the Al-12Si samples produced to evaluate the differences and to understand the phase formation in the Al-12Si-TNM SLM composites.…”

Section: Introductionmentioning

confidence: 99%

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Processing of Al–12Si–TNM composites by selective laser melting and evaluation of compressive and wear properties

et al. 2015

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Al-12Si (80 vol%)-Ti 52.4 Al 42.2 Nb 4.4 Mo 0.9 B 0.06 (at.%) (TNM) composites were successfully produced by the selective laser melting (SLM). Detailed structural and microstructural analysis shows the formation of the Al 6 MoTi intermetallic phase due to the reaction of the TNM reinforcement with the Al-12Si matrix during SLM. Compression tests reveal that the composites exhibit significantly improved properties (;140 and ;160 MPa higher yield and ultimate compressive strengths, respectively) compared with the Al-12Si matrix. However, the samples break at ;6% total strain under compression, thus showing a reduced plasticity of the composites. Sliding wear tests were carried out for both the Al-12Si matrix and the Al-12Si-TNM composites. The composites perform better under sliding wear conditions and the wear rate increases with increasing loads. At high loads, the wear takes place at three different rates and the wear rate decreases with increasing experiment duration.

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Section: B Mechanical and Tribological Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Processing of Al–12Si–TNM composites by selective laser melting and evaluation of compressive and wear properties

et al. 2015

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“…Meanwhile, the network microstructure of SLM-processed composite performed regularly (Figure 3c). This phenomenon was attributed to Marangoni convection [2,17]. As a large laser power was used, a considerable intensity of Marangoni convection was obtained, which evidently favored the sufficient spreading of reinforcements.…”

Section: Microstructure Characterzationmentioning

confidence: 99%

“…To further investigate the thermodynamic behavior within the molten pool during the selective laser melting Al 2 O 3 /AlSi10Mg composite, a physical model was established using a finite volume method (FVM) and the corresponding physical properties of materials was properly settled according to [17]. The heat and mass transfer, the surface tension induced by the temperature gradient, and the movement of laser beam power with a Gaussian energy distribution was taken into account in the numerical model.…”

Section: Numerical Simulationmentioning

confidence: 99%

Effect of the Thermodynamic Behavior of Selective Laser Melting on the Formation of In situ Oxide Dispersion-Strengthened Aluminum-Based Composites

Wang

Jue

Xia

et al. 2016

Metals

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This paper presents a comprehensive investigation of the phase and microstructure, the thermodynamic behavior within the molten pool, and the growth mechanism of in situ oxide dispersion-strengthened (ODS) aluminum-based composites processed by a selective laser melting (SLM) additive manufacturing/3D printing process. The phase and microstructure were characterized by X-ray diffraction (XRD) and a scanning electronic microscope (SEM) equipped with EDX, respectively. The thermodynamic behavior within the molten pool was investigated for a comprehensive understanding on the growth mechanism of the SLM-processed composite using a finite volume method (FVM). The results revealed that the in situ Al 2 Si 4 O 10 ODS Al-based composites were successfully fabricated by SLM. Combined with the XRD spectrum and EDX analysis, the new silica-rich Al 2 Si 4 O 10 reinforcing phase was identified, which was dispersed around the grain boundaries of the aluminum matrix under a reasonable laser power of 200 W. Combined with the activity of Marangoni convection and repulsion forces, the characteristic microstructure of SLM-processed Al 2 Si 4 O 10 ODS Al-based composites tended to transfer from the irregular network structure to the nearly sphere-like network structure in regular form by increasing the laser power. The formation mechanism of the microstructure of SLM-processed Al 2 Si 4 O 10 ODS Al-based composites is thoroughly discussed herein.

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“…The simulation of reaction sintering process for Al-AlN50Si B and Al-AlN-50Si M materials was performed using the computational fluid dynamics code, ANSYS-FLUENT software (ANSYS Inc., USA) which uses a finite element numerical method [24,25]. The conservation principles of mass, momentum and energy were calculated considering the continuity equation for the incompressible fluid.…”

Section: Numerical Modelmentioning

confidence: 99%

Impact of structure and flow-path on in situ synthesis of AlN: Dynamic microstructural evolution of Al-AlN-Si materials

Wang

Tong

et al. 2018

Sci. China Mater.

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The Al-AlN-Si composites were prepared in the gas-in-liquid in situ synthesized flow-reaction-system, which was implemented by a powder metallurgy and reaction sintering route. The experimental results showed that Al-AlN50Si B material (prepared by ball-milling powders) and AlAlN-50Si M material (prepared by mixing powders) exhibited the semi-continuous Si structures and the isolated Si islands, respectively. Subsequently, the Al-AlN-50Si materials were selected as the model materials by phase identification and microstructure analysis. The dynamic microstructural evolution of Al-AlN-50Si materials was investigated using the computational fluid dynamics (CFD) method. Mathematical models and simulation results showed that the in situ synthesis of AlN was strongly influenced by the structure and the flowpath ((c g,N 2 /l g,N 2 )+(c s,AlN /l s,AlN )). The flow paths of Al-AlN-50Si B material were restricted by the semi-continuous Si. These Si structures can promote the formation of the strong turbulence with gradually weakened fluctuation, so that the in situ synthesis of AlN was interconnected and surrounded by an interpenetrating Si network. In contrast, the flow paths of AlAlN-50Si M material can easily pass through the isolated Si due to its mild turbulence with linear relationship. As a result, AlN was separated by the isolated Si and agglomerated in the matrix. Overall, the present work provides new insights into dynamic microstructural evolution in in situ reaction sintering systems.

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Particulate migration behavior and its mechanism during selective laser melting of TiC reinforced Al matrix nanocomposites

Cited by 157 publications

References 24 publications

Processing of Al–12Si–TNM composites by selective laser melting and evaluation of compressive and wear properties

Processing of Al–12Si–TNM composites by selective laser melting and evaluation of compressive and wear properties

Effect of the Thermodynamic Behavior of Selective Laser Melting on the Formation of In situ Oxide Dispersion-Strengthened Aluminum-Based Composites

Impact of structure and flow-path on in situ synthesis of AlN: Dynamic microstructural evolution of Al-AlN-Si materials

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