Effect of clustering on particle pushing and solidification behaviour in TiB2 reinforced aluminium PMMCs

Youssef, Yehia M.; Dashwood, R. J.; Lee, Peter

doi:10.1016/j.compositesa.2004.10.027

Cited by 183 publications

(78 citation statements)

References 42 publications

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“…The reinforcement particle tends to react wit1 matrix material in molten state or decompose at higher temperatures to form undesirable compounds which deteriorates the properties of metal matrix composites. Though liquid metallurgy routes are economical for mass production, the homogeneous distribution of reinforcement particles in the casting is a challenge [17,18]. The Mixing process of matrix materials and reinforcements in powder metallurgy methods is time consuming, high expensive, energy consuming and it is difficult to obtain a bulk material with high density [19].…”

Section: Introductionmentioning

confidence: 99%

Process Parameters Optimization for Producing AA6061/TiB₂ Composites by Friction Stir Processing

Santha¹,

Ramanaiah

2017

Strojnícky Casopis – Journal of Mechanical Engineering

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Friction stir processing (FSP) is solid state novel technique developed to refine microstructure and to improve the mechanical properties and be used to fabricate the aluminium alloy matrix composites. An attempt is made to fabricate AA6061/TiB2 aluminium alloy composite (AMCs) and the influence of process parameters like rotational speed, transverse feed, axial load and percentage reinforcement on microstructure and mechanical properties were studied. The microstructural observations are carried out and revealed that the reinforcement particles (TiB2) were uniformly dispersed in the nugget zone. The Tensile strength and Hardness of composites were evaluated. It was observed that tensile strength, and hardness were increased with increased the rotational speed and percentage reinforcement of particles. The process parameters were optimized using Taguchi analysis (Single Variable) and Grey analysis (Multi Variable). The most influential parameter was rotational speed in single variable method and multi variable optimization method. The ANOVA also done to know the percentage contribution of each parameter

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Section: Introductionmentioning

confidence: 99%

Process Parameters Optimization for Producing AA6061/TiB₂ Composites by Friction Stir Processing

Santha¹,

Ramanaiah

2017

Strojnícky Casopis – Journal of Mechanical Engineering

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“…Later, the molten metal was mixed with the impeller and simultaneously ultrasonicated (17.5 kHz, 3.5 kW, 40 micron amplitude, Nb sonotrode) for 5 min at 680-710 0 C to ensure the dispersion of MgAl 2 O 4 particles and complete the reaction of silica particles. The holding and mixing processes were repeated three times and the composite was cast at 725 0 C in a steel wedge mould ( Figure 1) [16]. The mould was preheated at 200 0 C and metal was cast using a bottom pouring arrangement to ensure minimum porosity in the casting.…”

Section: Methodsmentioning

confidence: 99%

“…In the case of smaller particles (clusters) (few hundred nano meters to a few microns), the predictions and experimental results suggest the particle motion as stokesian and solidification front is likely to push or entrap particles between secondary dendrite arms [27,28]. Youssef et al [16] conducted detailed study on particle pushing and engulfment in Al-TiB 2 composites (from 0.12 to 3.5vol%TiB 2 ) using similar casting (steel wedge mould of same dimensions) and solidification conditions, where TiB 2 particles were identified as clusters of 10-20 µm and pushed towards grain boundaries in all solidification velocities for CPAl-TiB 2 composites and A514-TiB 2 composites. Further, particle engulfment was present only at larger solidification velocities.…”

Section: Solidification Of Al-mgal 2 O 4 Compositementioning

confidence: 99%

“…It is interesting to look at the MMC systems such as A514-TiB 2 [16], AZ91-SiC [33] where particles play dual roles in achieving finer grains via heterogeneous nucleation and grain growth restriction. Ferguson et al proposed an empirical relation to predict the grain size of MMC at different volume percentage (V) of the particles as follows [34]:…”

Section: Solidification Of Al-mgal 2 O 4 Compositementioning

confidence: 99%

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Structure–property analysis of in-situ Al–MgAl2O4 metal matrix composites synthesized using ultrasonic cavitation

Sreekumar

Babu

Eskin

et al. 2015

Materials Science and Engineering: A

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In-situ Al-MgAl 2 O 4 metal matrix composite was successfully manufactured using SiO 2 with the aid of ultrasonication. MgAl 2 O 4 particles and their clusters were identified at grain boundaries and interdendritic regions within the grain envelopes. The composite showed 2-5 fold of grain size reduction with respect to the reference alloy cast at similar conditions. The composite has shown 10% increase in yield stress and 15% increase in UTS while maintaining the ductility similar to reference alloy. CTE mismatch strengthening and grain boundary strengthening are suggested to be influencing in the improvement in mechanical properties.

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“…These flow fields enable stirring of molten composites without any mechanical stirrer. The critical melt velocity separates out clustered TiB 2 particles in aluminium and aluminium alloys [18].…”

Section: Introductionmentioning

confidence: 99%

On the Formation and Distribution of In Situ Synthesized TiB2 Reinforcements in Cast Aluminium Matrix Composites

Rane

Dhokey

2018

J. Compos. Sci.

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Introduction of TiB 2 reinforcements into aluminium matrices allows composites to be obtained that exhibit excellent mechanical properties and good wear and corrosion resistance. These composites find applications in the automotive, aerospace and marine industries. In the present work, the in situ synthesis of ultrafine TiB 2 particulates in an aluminium matrix was accomplished by reaction synthesis of TiB 2 using K 2 TiF 6 and KBF 4 (in 120% excess to the stoichiometrically needed) fluxes in pre-melted aluminium. Composites were prepared with different concentrations of TiB 2 in (2.5, 5 and 10 wt %) in an aluminium matrix. The holding time of the molten composite in an induction furnace was varied from 10 min to 50 min. The in situ formation of TiB 2 reinforcement and its distribution in cast aluminiummatrix composites was analyzed based on microstructural studies, microhardness measurements and wear tests. The exothermic reaction between the halide fluxes starts after 10 min of holding time and completes before 20 min of holding time. The dominant phase was TiB 2 after 20 min of holding time, while the formation of Ti 3 B 4 was observed as the holding time was extended. The distribution of the reinforcing phases was studied by analyzing the scanning electron microscopy (SEM) images. An optimum holding time (20 min) of the composite melt was determined based on the dominant wear mechanism, microhardness, and phase composition of the composites.

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Effect of clustering on particle pushing and solidification behaviour in TiB2 reinforced aluminium PMMCs

Cited by 183 publications

References 42 publications

Process Parameters Optimization for Producing AA6061/TiB₂ Composites by Friction Stir Processing

Process Parameters Optimization for Producing AA6061/TiB₂ Composites by Friction Stir Processing

Structure–property analysis of in-situ Al–MgAl2O4 metal matrix composites synthesized using ultrasonic cavitation

On the Formation and Distribution of In Situ Synthesized TiB2 Reinforcements in Cast Aluminium Matrix Composites

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Effect of clustering on particle pushing and solidification behaviour in TiB2 reinforced aluminium PMMCs

Cited by 183 publications

References 42 publications

Process Parameters Optimization for Producing AA6061/TiB2 Composites by Friction Stir Processing

Process Parameters Optimization for Producing AA6061/TiB2 Composites by Friction Stir Processing

Structure–property analysis of in-situ Al–MgAl2O4 metal matrix composites synthesized using ultrasonic cavitation

On the Formation and Distribution of In Situ Synthesized TiB2 Reinforcements in Cast Aluminium Matrix Composites

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Process Parameters Optimization for Producing AA6061/TiB₂ Composites by Friction Stir Processing

Process Parameters Optimization for Producing AA6061/TiB₂ Composites by Friction Stir Processing